|Chronological and political information|
- "I used to believe that being a good soldier meant doing everything they told you. That's how they engineered us. But we're not droids. We're not programmed. You have to learn to make your own decisions!"
- ―Rex, to Dogma
CT-7567, nicknamed "Rex," was a clone trooper captain during the Clone Wars, the galaxy-wide conflict between the Galactic Republic and the Confederacy of Independent Systems. Rex was in command of Torrent Company, a unit of the famed 501st Legion in the Grand Army of the Republic. Rex served under Jedi General Anakin Skywalker, and was a freethinking, tough, and aggressive trooper. Though loyal and committed to his duty and to his fellow clones, Rex proved capable of questioning his superiors and, under extreme circumstances, outright disobeying orders if he believed them to be wrong. Rex displayed a strong working relationship and a degree of friendship with Commander Cody.
Under General Skywalker, Rex would go to many different planets throughout the galaxy. Rex assisted High General Obi-Wan Kenobi and General Skywalker during the Battle of Christophsis, when he worked with Commander Cody to root out a traitor, and later led Torrent Company during Confederacy General Whorm Loathsom's multiple counterattacks. Rex also met Skywalker's new Padawan, Ahsoka Tano, after she arrived on Christophsis. Rex also participated in the Battle of Teth, where he was one of the few clone survivors before reinforcements arrived. During inspections of Republic listening posts, Rex and Cody encountered a squad of droids on the Rishi moon, and led a group of rookie clone troopers to retake the base.
Rex participated in the Battle of Bothawui, and later assisted Skywalker and Tano during a mission to destroy a Confederacy listening post—and was one of the few clone troopers, along with Sergeant Denal, to survive the mission. After rescuing Jedi General Aayla Secura from defeat by the Confederacy with Skywalker and Tano, the Jedi and clones, including Rex and Commander Bly, crash-landed on the remote world Maridun, and Rex stayed with Anakin since he was injured, while the others found help. After Confederacy General Lok Durd arrived on the planet to test a new weapon, Rex and Bly helped to defeat the Confederacy and save the inhabitants of the planet. Rex would later be an asset during a short war on Orto Plutonia, and would also help halt the release of the deadly Blue Shadow Virus. Rex also helped Skywalker and Tano during the Battle of Ryloth and retrieving a stolen Jedi holocron.
Clone trooper captain
- "The name's Rex. But you'll call me 'captain' or 'sir'."
- ―Rex to Echo, Fives, and Hevy
Rex was one of the many clones of bounty hunter Jango Fett, bred on Kamino by the Galactic Republic to fight in the Republic's clone army. The soldiers were bred to fight against the separatist planetary and sectorial governments seeking to leave the Republic, known as Confederacy of Independent Systems, in the coming war. Rex served on Geonosis alongside Denal and was promoted to the rank of captain, he was also in command of Torrent Company, a unit in the famous 501st Legion. Rex was assigned to Jedi General Anakin Skywalker, and would participate in many missions alongside the Jedi Knight, including Jabiim. Rex also developed a friendship with fellow clone trooper Commander Cody.
Battle of Christophsis
- "What's our plan of attack, sir?"
- ―Rex and General Anakin Skywalker before they ambush Separatist forces on Christophsis
After the CIS invaded the planet of Christophsis, High Jedi General Obi-Wan Kenobi, General Skywalker, Commander Cody and Captain Rex arrived on the planet to assist the planet's inhabitants. However, after a failed ambush on the Confederacy, the Jedi suspected that there was a traitor in their midst, and the Jedi left to scout behind enemy lines, while Rex and Cody stayed to find and apprehend the traitor. An impending investigation revealed that Sergeant Slick himself was the traitor, and after he severely damaged their weapons depot, Rex and Cody apprehended the traitor in a brawl, taking him afterward to lock-up.
When the Confederacy commenced their first attack, the Jedi and the clone forces were able to drive them back. Believing the battle to be over and Christophsis now under Republic control, Rex rested at a makeshift forward aid station where clone Sergeant Coric was administering first-aid to an injured trooper by the name of Ged, who had taken a spray of shrapnel to his shoulder. After offering a few words of sympathetic concern, Rex checked the casualty list for the battle on his datapad and found the list to be relatively short. While discussing the dwindling number of medical supplies and the soon expected return of the cruiser Hunter with Coric, the droid army returned in full force. Rex rushed out to fight again alongside Coric and Ged, joining Cody and Generals Kenobi and Skywalker on the front line. Rex led Torrent Company with Skywalker to destroy the advancing tri-droids. After the enemy retreated again due to the Republic's heavy artillery, Skywalker's new Padawan, Ahsoka Tano, arrived in place of the expected reinforcements. Rex was a little perplexed, as Skywalker had stated that he would never have a Padawan. As Rex and Tano spent some time talking together, Rex taught her that fear was natural in war—and that the clones were unique individuals, despite all having the same appearance.
While they talked, the two discovered that the Confederacy had deployed a deflector shield, which would make the Republic's long-ranged artillery useless. After some planning, Rex and his troops held the line, and as a distraction strategy, Kenobi "negotiated" with Confederacy General Whorm Loathsom for the surrender of the Republic forces. Meanwhile, Skywalker and Tano infiltrated the enemy lines to disable the shield generator. Once the shield was down, Rex ordered their cannons to quickly finish off the enemy advances. Grand Master Yoda arrived with reinforcement troops just in time, and Rex had a gunship retrieve Skywalker and Tano, congratulating both of them.
Battle of Teth
- "I don't like this place. It gives me the creeps."
- ―Rex as he enters the B'omarr Monastery
After a meeting with Yoda, Skywalker and Tano were given the mission to rescue Hutt crime lord Jabba Desilijic Tiure's son, in order to win the crime lord's favor for access to space lanes through Hutt Space. Rex accompanied the Jedi to the planet Teth. Tracking the Huttlet to a cliff-high monastery, the Republic forces were forced to commence a vertical assault to enter the monastery. They were successful, but half of Torrent Company was lost on the way up.
Skywalker and Tano rescued the Huttlet while Rex and his men secured the monastery. The arrival of more Confederacy battle droids forced the Republic forces to barricade themselves inside the monastery. Skywalker and Tano left to find a rear exit to search for medical attention for the ill Huttlet, while Rex stayed to command the remaining clones. Once the droid army entered, a few of the troopers were killed, however Rex feigned death to spy on the commander of the droid forces, Dark Acolyte Asajj Ventress. Rex attempted to shoot the Dark Jedi, but she pulled his blaster out of his hand with the Force and choked him. Ventress demanded Skywalker's location, which Rex refused to give, and she employed a mind trick to force Rex to contact the Jedi. However, Ventress underestimated Rex's mental strength—Rex contacted Skywalker, but addressed him as his first name, "Anakin," instead of his usual "General Skywalker", which warned the Jedi of something amiss. Ventress left to confront the Jedi herself, while the battle droids held the six surviving clones captive.
Rex and the other remaining troops broke free of their captors, stole their weapons, and―using a fallen AT-TE for cover―reignited the battle with the droids. Skywalker and Tano escaped the monastery, and found an aged freighter, using it to head back toward the courtyard. However, because of their mandate to safely return the Huttlet to his father, Skywalker and Tano were forced to find medical attention for the Huttlet, and were unable able to give Rex assistance, to which he understood. General Kenobi and the 212th Attack Battalion soon arrived to reinforce Rex and his men, and the Republic forces were able to beat back the Confederacy. By that time, though, only five other men from Torrent Company were still alive. Later, Rex mused to Cody that the whole operation had been handled poorly, with the lack of air support and incorrect infantry application.
Battle of Gwori
Rex accompanied Anakin Skywalker, Obi-Wan Kenobi, and Ahsoka Tano to Gwori during the Republic's attempt to infiltrate their planetary defenses and destroy their Separatist ship construction facilities. In order to bypass Gwori's scanners which detected all life forms and immediately vaporized them, Rex was encased in carbonite and jettisoned to the planet from space. When the group split up, he accompanied Tano and R2-D2 to find a communications outpost and contact Plo Koon and Saesee Tiin, who were waiting above-planet with bombers to receive the location of the targeted construction plants. Rex and Tano were discovered by the plant overseer Juhm and were forced to flee to a nearby cave, where they were forced to combat native wildlife. Despite their best efforts to evade detection, Rex and Tano were discovered by Juhm the next day, captured, and secured to electrocuting stakes alongside Skywalker and Kenobi, who had also been apprehended during their mission. That night Skywalker and Kenobi used their Force powers to obliterate their guards and R2-D2 freed them from their restraints. Together, the group returned to the slave quarters and convinced them to overthrow their Separatist leaders and escape Gwori, leaving the shipyards a free target for Koon and Tiin. Rex escaped off-planet with the rest of his comrades and was able to watch the destruction of the construction facilities from the security of space.
Mission to Mon Gazza
Later in the war, the Jedi Council discovered that Republic intelligence was being transferred to the Separatists via a spy in the Senate. Tasking Ki-Adi-Mundi to lead the investigation against the rogue Senator, they soon discovered that the Senator was being extorted by Asajj Ventress. Confronting Ventress himself, Ki-Adi-Mundi was able to discern that a disc containing all relevant Republic intelligence for the war had been transferred to the Senator's associate Messo. Fighting on Queel, Rex, Anakin Skywalker, Obi-Wan Kenobi, and Ahsoka Tano were contacted by Yoda and Ki-Adi-Mundi. While Kenobi remained behind and mopped up Separatist forces, Rex, Skywalker, and Tano were instructed to follow Messo to Mon Gazza, where they were to reacquire the data disc at any cost. The trio followed Messo to a Podracing tournament, where Skywalker cornered the spy and learned that he had already passed the chip on to one of the Podracers before he fell from a balcony, dying instantly. Conjuring up a plan which placed Tano as a Podracer in the tournament, Skywalker and Rex began to investigate their prime suspect, the famed Podracer Kidd Kareen. They were caught by Kareen's crew and forced to defend themselves, and were only saved by conflict when Kareen intervened. They later discovered that Kareen's crew mate Maxus was in direct contact with Count Dooku regarding the information, and proceeded to watch Tano's Podrace from the sidelines, forced to act as only observers when Maxus and Ventress attempted to kill Tano and obtain the data disc for good. Tano was able to hold them at bay long enough for Skywalker to arrive to help, and the data disc was preserved safe from Separatist hands.
Inspection of the Pastil Post
- "All right, this is a Code Aurek alert."
- ―Rex sounds an alert in the outpost
Rex was later assigned to inspect several Republic listening posts with Commander Cody. During an inspection of a Pastil outpost, Rex commented that the station was very clean, and trooper Stripe told them that an MSE-series droid nicknamed "Rodent" was the reason, commenting on its odd behavior of being "glitchy". Seeing a serious red flag, Rex called out for a Code Aurek alert, ordering all clones to find the droid and destroy it. At first, the clones believed Rex to be paranoid; however, when Rex shot at the droid, he revealed a spy droid in their midst, as the four wheels of the destroyed body started spinning off independently in an attempt to escape. Three wheels were eliminated before Stripe stopped the fourth by throwing a thermal detonator before it could escape. Somewhat amused, Rex ordered the troops to "clean the mess up."
Battle of the Rishi moon
- Rex: "All right, listen up. There's only one target of interest in this sector: Kamino. It's the closest things we clones have to a home. Today, we fight for more than the Republic. Today, we fight for all our brothers back home. Understood?"
- Echo, Hevy and Fives: "Sir, yes, sir!"
- ―Rex to Echo, Hevy and Fives[src]
When Rex hailed the station, a trooper answered and tried to make them go away. After contacting, Rex thought something was not right there. After Rex and Cody's shuttle arrived at the outpost on Rishi moon, the two were met by a clone trooper claiming that the station did not require an inspection. Rex insisted on seeing the sergeant in command. Rex and Cody noticed a droid attack signal flare being fired, and Rex promptly fired a blaster bolt in the droids head, much to Cody's initial shock. However, after Rex removed the helmet of the "trooper", it was revealed to be a new commando droid. Their cover blown, the droids commenced an attack on the two clones and deployed several explosives. Rex and Cody were able to escape; however, with the shuttle destroyed, they had no way to contact the Republic.
Rex and Cody met the rookie clones who had manned the listening post, Echo, Fives, and Hevy, shortly before its invasion. Rex declared them "shinies"—a derogatory nickname for rookie troopers, for their clean armor that had not yet seen action—and led them to take back the outpost. Rex was able to trick the commando droids in opening the doors by pretending to be a commando droid in disguise by using a droid head, then led Cody and the rookies inside to retake the station. After doing so, an approaching Separtist fleet, under command of General Grievous, revealed that Kamino, the planet home to the Republic's cloning facilities, was at risk. In addition, the droids had hot-wired the "All Clear" signal to keep the Republic unaware of the attack. Rex devised a plan to blow up the base; the destruction of the base would stop the signal and warn the Republic of the impending attack. After Rex discovered a malfunction with the remote detonator, Hevy took over while the other clones left to take shelter. The four learned that Hevy was being attacked by the droids, and rushed back to help him. However, against Rex's wishes, Hevy sacrificed himself and manually detonated the explosives. The Republic fleet arrived in the system, under command of Generals Kenobi and Skywalker and Admiral Wullf Yularen, and was able to drive Grievous' fleet out of the system. Rex inducted the survivors, Echo and Fives, into the 501st Legion for their bravery, and acknowledged Hevy's sacrifice.
Respite aboard Leveler
- "Suddenly everyone wants us to take a day off."
- ―Rex aboard RAS Leveler
At the request of General Skywalker, Rex agreed to take Ahsoka with him for a three-day respite on a shakedown cruise aboard Captain Gilad Pellaeon's Acclamator-class assault ship, Leveler. Accompanying them, were seven other clone troopers: Sergeant Coric and six new clones by the names of Ross, Boro, Joc, Hil, Vere, and Ince. Fresh from Kamino, the six were among Torrent Company's replacements following the devastating losses at the Battle of Teth. Aboard the shuttle they were using in transit to Leveler, Rex did his best to comfort Ahsoka, laying to rest her fears that Skywalker had wanted her away because she was bothering him. He also found himself with the task of getting the six stiff rookie troopers to relax, open up, and bond with each other. Theorizing that they may have been nervous about being a part of the 501st now, Rex was concerned that if they didn't begin to show those individual signs of uniqueness that helped one clone recognize another among a sea of identical faces and armor, he would have to resort to using his tally sensor to see who each of them were, a prospect he looked upon as disrespectful. With a bit of humorous teasing, he encouraged them to loosen up and talk amongst themselves, and found with some satisfaction that Trooper Ince had a decent sense of humor.
Once the shuttle docked with Leveler, Rex could only stand back and watch in silence as Ahsoka and Captain Pellaeon argued over her revealing attire and Pellaeon's requirement that she cover up in naval fatigues. When the Padawan finally relented and retreated back into the shuttle to change, Pellaeon greeted Rex cheerfully and invited the man for a drink. Ahsoka, however, asked Rex to go show her Leveler's new armament of concussion missiles. Rex obliged and the missile bay was where Pellaeon found the two of them after making his rounds about the ship. With his helmet off, Pellaeon was surprised by Rex's blue-dyed, stripe-cut hairstyle which he had adopted in support of his favorite bolo-ball team making it to the finals. The two captains were discussing Leveler's recent upgrades when the alert sounded that enemy vessels had come out of hyperspace in the Fath system. It was at that time that Rex found his helmet's HUD was unable to patch in to the ship's operational and tactical data, another in a growing list of glitches being tallied following Leveler's refit. Ahsoka felt a disturbance in the Force, and although Pellaeon was skeptical, Rex vouched for her intuitive abilities and went to gather his men should they be needed as Leveler moved toward the Separatist fleet activity.
Rex found Ahsoka and his men in a bunk compartment, Coric laying out the schematics of the ship's targeting array for the rookie troopers. Without their helmets, Rex could see that each of them had their uniform meticulously trimmed black hair, and he felt somewhat guilty for his own novelty haircut; he shaved it off shortly after, in retrospect considering it a "dumb fad" and undignified for an officer. While in the compartment, the troopers discussed gossip of Pellaeon's private life, specifically his relationships with women. When Ahsoka spoke up about the danger of attachments, it became an open debate among the her and the men as to just what the Jedi's feelings on love, sex, and attachment were, and why. At the point when Ahsoka looked to be a bit overwhelmed, Rex tactfully stepped in and opened a window in the conversation for her to subtly excuse herself from the compartment before admonishing his men for being a bit rough on her. On the other hand, though, Rex could see that the rookie troopers were coming together and settling in well and decided he no longer needed to worry about them.
After instructing his men to prepare for action should it be required, he decided to comm General Skywalker to apprise him of Leveler's latest activity. Since Pellaeon had warned Fleet Ops, Rex suspected that Skywalker may be questioned about it later. While he didn't know that Skywalker was secretly spending time with Padmé Amidala at her Coruscant apartment, Rex knew there could be harsh consequences were he to be caught being out of the loop. Skywalker was grateful, and although Rex thought it unnecessary, decided to rendezvous with Leveler as soon as possible. Not long after, Rex was on the bridge when the freighter Wookiee Gunner, in service to Jedi Master Djinn Altis and his Jedi sect, dropped out of hyperspace and requested Leveler's aide in extracting a Republic Intelligence agent, whose distress beacon the Jedi had determined was coming from JanFathal. Pellaeon hesitated at first, wary of a fake message and a potential ambush, but upon getting confirmation from Republic Intel that they did indeed have an agent operating on JanFathal in need of an extraction, he authorized Wookiee Gunner to dock and asked Rex if he and his men were prepared to extract the Intel agent. As the only ground troops embarked aboard Leveler, Rex quickly replied that they were. Moments later upon finding out the identity of the agent, Pellaeon announced to everyone on the bridge that he had a personal interest in the mission: Agent Hallena Devis was "a very good friend".
Once Jedi Master Altis and his Jedi companions Callista Masana and Geith Eris were on board, Pellaeon assembled them along with Ahsoka, Rex, and his men in one of Leveler's meeting rooms to plan the extraction. When Pellaeon alluded to the possibility that he would personally go and participate in the rescue of his lover, Rex objected. He stated that it was his and his men's responsibility since there were no other embarked troops, and declared that this rescue would be done his way so as not to repeat the tragic loss of life on Teth. He knew that it wouldn't be a battle—there was nothing they could do in the face of overwhelming CIS forces—and there were no reinforcements on their way, save Skywalker, so all his team could do was try to rescue Agent Devis and get out. Rex came up with a plan as to how they would carry out the extraction, but until a location for Devis could be pinned down, they couldn't plan for the where. Geith suggested that the clones leave the job to the Jedi due to their abilities to locate others through the Force, but Rex insisted, stating that neither he nor his men would feel right to sit the mission out while others went in their place.
While the anonymous shuttle the rescue team would use during the mission was being prepared, Rex spoke with Pellaeon about their infiltration procedure and Ahsoka's unease around the new Jedi who possessed beliefs different than the core of the Jedi Order. When Pellaeon expressed his doubts of the young Padawan's ability, Rex was quick to defend her, saying, "she's a lot more competent than she looks." He also opted for the protection and communication capabilities of his armor rather than changing into civilian clothing, despite the considerable target the brilliant white armor and blue stripes made. He comforted the worried naval captain when it became obvious Pellaeon was thinking of Hallena. When the Jedi had finished getting a referential feel of Agent Devis' impression in the Force from a stylus of hers that Pellaeon had kept—determining that she was both alive and strong—Rex and his troops boarded the shuttle with Ahsoka, Callista, Geith, and Master Altis. Meanwhile, Leveler moved into range for shuttle launch.
Extraction on JanFathal
- "Locate, confirm she's alive, have one team ready to distract while the other extracts, and then we exfil."
- ―Rex, on how they would carry out Agent Devis' extraction from JanFathal
As the anonymous shuttle carried Rex and the rest of the extraction team from Leveler toward the surface of JanFathal―Sergeant Coric at the controls―Rex took comfort in the thought that this time would be different than Teth, and that it was "only half as insane" as trying to take a heavily armed mesa from the ground up. When it became clear that Ahsoka was still troubled by Master Altis and the other Jedi of his sect, Rex did his best to ease her mind and get her to focus on the mission at hand, asking the Jedi to set aside their theological differences for the time being. He also had to deal with the rookie troopers' unfulfilled expectations of Jedi from training on Kamino, now that they had contact with actual Jedi who didn't behave as they had been led to believe. Once in the planet's atmosphere, Altis took up the role of navigator for Coric and led them over JanFathal's capital, Athar, in search of Agent Devis' location. Rather than stay in the air longer than necessary and risk being seen, Rex ordered Coric to set the shuttle down somewhere out of sight, eventually settling near a repulsortruck factory. Troopers Boro and Joc took up defensive positions around the shuttle while the others ran for cover.
Now on foot, Ross deployed a small remote probe for reconnaissance. At Altis' request, Ross removed his helmet and handed it to him, effectively allowing the Jedi Master control of the probe. Rex was amused by the odd sight of a Jedi with what appeared to be the head of a clone trooper and savored the image. With the Force-guided probe at his disposal, it wasn't long before Altis located the building in which Agent Devis was being held. When Rex explained the plan for how they would get her out, Ahsoka offered to take the roof, however Rex thought it better that she and Callista provide cover from the street in case battle droids should show, insisting that he wasn't just saying that to keep her safe from the action. The battle droids would in fact come marching toward their position and it was up to the two of them to hold the droids there while Rex and the others carried out the rescue.
Rex ordered Joc, Ince, and Ross to cover the exit while the rest of the team accompanied him onto the roof. Altis would knock on the door, pretending to be nothing more than an old man looking for his lost daughter in the chaos of the battle. He managed to draw two of the hostage takers to the door before Rex and the troopers dropped through the skylight. Altis killed one, while blasterfire from the troopers killed the second. Inside the room, a third man held a blaster to Agent Devis' temple and attempted to bargain her life for his own as Rex stood with his own blaster to the man's head. Rex, however, simply pulled the trigger, killing the man instantly before cutting the agent's bindings. With the droid army closing, they needed to leave quickly so Geith leaped down the staircase and threw up his hands; Hil threw Agent Devis down to him and the two ran for the shuttle with Ince, Joc, and Ross. As they fled the building, Rex congratulated Altis on his performance. Outside, the battle droids had reached them, but Ahsoka and Callista had formed a makeshift barricade from downed droids. Rex gave the order for Coric to lift off when Agent Devis was aboard. Then, he, his men, and Altis, ran out to join the battle. Vere was hit by a droid's grenade and although Boro tried desperately to save him, he was already dead. Rex put aside his grief for the moment and was prepared to sacrifice himself in order to allow the others to get out alive. Master Altis and the other two Jedi used the Force to bring down large chunks of masonry from the surrounding buildings on top of the droids. As they prepared to go for the shuttle, Coric commed Rex to tell him that the shuttle was coming to them. When Rex reiterated his order to stay put, Coric replied that it was Agent Devis' idea to come back for them and that "an officer's missus always outranks him, so she's like a commodore. And she's in my face." After a fast-paced sprint down the open street, Rex and the others managed to safely get aboard the shuttle and lift off.
Once on board, Hallena Devis expressed her gratitude toward Rex for saving her life, and also offered her condolences for Vere. The remaining rookie troopers had cut off external communications, retreating to their own frequency for a moment of privacy that Rex didn't dare intrude upon. He watched as Altis, sitting next to Boro—who seemed to be hit hardest by Vere's death—quietly laid a sympathetic hand on the man's forearm and was touched by the Jedi Master's kindness. It was around that time that General Skywalker arrived in a V-19 Torrent starfighter. However, at the same time, a Separatist Light Cruiser first identified as Discord but proven shortly after to be the far deadlier destroyer Reaper, moved to attack Leveler. Rex figured that if a ship as well armed as Reaper hadn't already tried to destroy Leveler when in range, it was interested instead in disabling the ship. The shuttle was almost within docking range when Coric announced to the others that Leveler was gone. Rex refused to believe that Pellaeon had run, suggesting the possibility that he had switched off his transponder, but nevertheless had to plan for another option. He tasked Boro—who Rex believed needed a distraction from his grief—with getting an estimate for how much oxygen they had left, and whether or not they could make it to Kemla; Boro calculated enough oxygen for halfway, with more if they could limit their consumption. So, as it was, Rex saw three options: wait for Leveler to return, reduce the number of people breathing the hard way, or head back planetside where there was sustainable oxygen. Although Altis informed him of the Jedi ability to put themselves into a deep trance that reduced the amount of oxygen they consumed, it was eventually decided to return to JanFathal—specifically to Athar.
Skywalker, determined not to repeat his forced abandonment of Rex on Teth, seeing the shuttle descending toward JanFathal and was quick to figure out that Leveler had jumped to hyperspace leaving the extraction team lacking both oxygen and options, began following closely after them. Rex warned the general that there was little he could do for them in this situation, but Skywalker refused to leave. Rex's respect for the Jedi Knight was redoubled, and although there had been no transmission from Leveler before she had jumped, Rex still believed that Pellaeon had a plan. Coric set the shuttle down in the shadow of a viaduct, and Skywalker landed his fighter nearby before rushing to join them. Introductions were made and Skywalker sent Ince and Boro to locate one of the Confederacy's CR-20 troop carriers so they could commandeer it as a way off the planet. At the same time, Altis received word from other members of his Jedi sect that they had found Leveler, which was experiencing some technical problems and would be returning as soon as possible. When they found a CR-20, Altis devised a plan where he would again play an unassuming old man who, with the help of Ahsoka, was looking for aide for his wounded granddaughter from the ship's Neimoidian owners. As he went off toward them, carrying Ahsoka in his arms, Rex and his men took up support positions not far away with Callista. After several moments of theatrical wailing and subtle mind influence that fully absorbed the attention of the Neimoidians and their droids, Skywalker and the other Jedi, along with Devis, made a dash for the transport while Rex and his men opened fire. At that moment, Altis and Ahsoka shed their deception and attacked. Within moments, they had killed the Neimoidians, destroyed the sentry droids outside, and the Jedi pressed forward up into the vessel, eliminating the battle droids inside until they secured the ship. With Skywalker in the pilot's chair and Altis beside him as co-pilot, they lifted off and moved the ship to extract Rex, Callista, and the troopers who were under droid fire.
Ince was down, having been shot in the leg, and Hil tried to keep pressure on the femoral artery as Rex and Callista continued to lay down cover fire. When Skywalker landed the ship, everyone but Rex and Ross rushed Ince inside, Callista using the Force to help slow his bleeding. The two soldiers held off a Vulture droid, eventually destroying it before scrambling aboard the CR-20 and taking off. By then, Leveler had returned and the warship became the target of their escape. Rex and Ahsoka manned the troop carrier's cannons while the others tended to Ince, desperately trying to stop the bleeding from his leg and save his life. Skywalker managed to land the carrier inside Leveler's hangar and the waiting medical teams rushed Ince to the ship's medbay. While Ahsoka and Callista ran to repair the ship's concussion missile array, Rex remained at Ince's side. That was where Pellaeon would find him still when the battle had ended. He informed the naval captain of Ince's failing kidneys and massive loss of blood while he watched grimly from the side. It wasn't long after that Ince finally succumbed to his injuries, and Rex stormed out of the medbay, grimacing that there now "two troopers he had to replace" as he hid his face beneath his helmet.
When Ahsoka found the grieving captain, he was in Leveler's Chief Petty Officer's mess. At first he thought she was there to try to make him feel better, but she had actually come to him for council with her own problem—one surprisingly similar to his own: doubt. When she asked how he coped with days like that, he could only reply that he was a soldier and it was what soldiers do, but then revealed that he felt cheated by his limited place in life. Rex was surprised when Ahsoka held his hand and asked if it was true that the clones were being used, and she was guilty of using him. Thoughts like those had bothered Rex for some time but, despite it all, he chose to put it out of his mind, believing that, if he dwelt on thoughts like that, he wouldn't be able to do his job. They talked about the differences between Master Altis and the beliefs of those who followed him in comparison to those of the more orthodox Jedi—specifically on the subject of attachment—and Rex began to suspect that Ahsoka might have had feelings for someone. In the end, Rex realized that clone troopers and the Jedi were not entirely dissimilar, both "in a spot they didn't choose, and making the best of it" and that all he could do was focus on looking out for his brothers and friends, taking out the enemy before they got him.
Battle of Bothawui
Rex was later stationed with General Skywalker and Commander Tano to protect the planet Bothawui. After the Republic's defeat on the planet Falleen, General Grievous and his Confederacy fleet headed to attack Skywalker and his fleet of three Venator-class cruisers, including his flagship, the Resolute. General Kenobi contacted Skywalker, advising him to retreat; however, Skywalker intended to stay and fight.
Skywalker dispatched Rex to command a brigade of AT-TE walkers from several asteroids, aiming to outflank Grievous' fleet once the general arrived. Grievous' fleet of several Munificent-class frigates easily fell into Skywalker's trap, and the cyborg general fled aboard his fighter as his fleet was ripped apart from both in front and behind. Skywalker pursued Grievous in his own fighter, along with his astromech droid, R2-D2. Skywalker's ship was severely damaged by flying debris, and Rex managed to save him. However, when Skywalker awoke in the medbay of the Resolute, he discovered that Artoo had gone missing.
Skywalker and Tano left aboard the Twilight to search for Artoo aboard a nearby scavenging ship, but were unaware that the ship's captain, Trandoshan scavenger Gha Nachkt, had already pilfered the droid and promised him to Grievous. After they returned, Skywalker left with replacement droid R3-S6 in his fighter to scout ahead for a Confederacy listening post. However, the droid "accidentally" activated the fighter's tracking beacon, and Tano and Rex hurriedly gathered a squad of troopers and departed aboard the Twilight to assist Skywalker. Arriving out of hyperspace, they arrived in time to save Skywalker from two Munificent frigates under Grievous' command, and escaped out of the system.
Mission to Skytop Station
- "Next time, you're lugging this astromech around."
- ―Rex insists that he will not carry an astromech again
The Twilight received a message from R2-D2, and Rex and the clones were able to track the signal. On Skywalker's order, the group headed to the location of the transmission—Skytop Station, the Confederacy listening post that the Republic had been searching for. Upon entering the station, Skywalker left to search for Artoo, while Tano, Rex, Sergeant Denal and the four other clone troopers were to plant explosives around the station.
R3 attempted to open a door protected by a ray shield, but two patrols of battle droids arrived, and Tano and the clones were caught in a crossfire. Rex utilized several EMP grenades, and the droids were immobilized. However, General Grievous himself appeared, and knocked Tano aside before attacking the clones. Rex and Denal were knocked unconscious, and the other clones were killed. Grievous attempted to deal a death blow to the unconscious Rex; however, a revived Tano quickly stopped Grievous' blow with her own lightsaber. Tano engaged the cyborg general alone, allowing the clones to complete the mission. Upon revival, Rex reported their losses to Tano, and also protested to her intention of engaging Grievous alone, but complied when she gave a direct order.
Rex and Denal arrived in the hangar bay and rendezvoused with the Twilight, Skywalker and R3-S6. Skywalker had rescued Artoo, but was alarmed when he learned that Tano had engaged Grievous alone. As the group attempted to find and assist Tano, R3 revealed his true allegiances—to the Confederacy—and sealed the group inside the hangar, and also activated several Vulture droids. Super battle droids arrived, and Skywalker and the clones took cover behind several crates. Skywalker ordered Rex to trigger the explosives, and Rex complied. Tano soon arrived, and Rex noticed several fuel cells next to the crates. Skywalker hurtled one at the droids with the Force. Rex placed a well-aimed shot on the crate, and it exploded, destroying the droids. Artoo was able to open the door from a set of outer controls, as well as destroy R3-S6 in a duel, and after the Republic forces departed aboard the Twilight, Skywalker went to retrieve the droid in his fighter.
Mission to Christophsis
At some point during the Clone Wars, Rex, along with Senator Padmé Amidala, R2-D2 and protocol droid C-3PO, was sent to Christophsis to investigate crystals being stolen from the planet by the Nightsisters. Rex was injured in a fight, and the four were captured and imprisoned. A Jedi team of two, along with clone troopers led by Commander Gree, were sent to Christophsis to rescue them. The Jedi managed to find the prisoners, and the four escaped to Gree's gunship, which had a medical console on standby for Rex.
Battle of Quell
- Rex: "Hey, kid!"
- Ahsoka: "I know, I know! I'm hanging on."
- ―Rex and Ahsoka Tano, during a typical crash landing[src]
Later, Rex participated in assisting Skywalker and Tano rescue Jedi General Aayla Secura, whose forces were on the verge of defeat by Confederacy forces. Skywalker and his forces arrived in the Resolute, and used several gunships to land on Secura's cruiser, the Liberty. However, after Skywalker went on ahead, Tano and Rex's gunship was attacked by one of the Confederacy rocket droids, and they were forced to crash-land on the cruiser. Tano, Rex and their forces met up with Skywalker, Secura and Commander Bly, and proceeded to escape the cruiser via a Republic frigate. However, a raging inferno caused by increased laser fire passed through the ship, and Skywalker sacrificed himself to save the others. Tano and Secura were able to bring the unconscious and gravely wounded Jedi Knight aboard the frigate, but as they attempted to dock with the Resolute, an attack by Vulture droids engaged the frigate's hyperdrive, sending the frigate into hyperspace. The group narrowly avoided hitting a star, but crash-landed on a remote planet.
Rex stayed to guard Skywalker, while Tano, Secura and the rest of the clones left to find help. Skywalker awoke, and Rex was attacked by a mastiff phalone—a birdlike, carnivorous creature native to the planet. Rex was able to fend the creature off with blaster fire, but after morning arrived, two more of the creatures returned. Despite his injuries, Skywalker insisted on fighting, and Rex incapacitated one of the creatures with a laser shot. Rex was knocked aside, and the return of Tano, Bly and Wag Too—a healer from the Lurmen colony on the planet—saved his life. Rex and Tano helped Too tie up the last creature, and the group returned to the colony with him, taking the injured Skywalker on a stretcher.
Battle of Maridun
- Rex: "Commander Bly, we've got company."
- Bly: "Friendlies?"
- Rex: "Negative, sir. A droid ship. Coming straight our way."
- ―Rex and Bly[src]
While Skywalker's injuries were tended to by the Lurmen, Rex noticed an incoming Confederacy C-9979 landing craft. Not wanting to let the Lurmen suffer for their presence, the Republic forces decided to hide, and Rex and Bly assisted the still-injured Skywalker in their escape. A Confederacy recon droid came upon the group, and Tano, Rex and Bly chased the droid down before Secura impaled it. From a tree, the group noticed that the Confederacy forces had set up their base—and had brought a shuttle, which the Republic forces intended to steal to escape the planet. However, Skywalker noticed that the Confederacy general, Neimoidian Lok Durd and his weapons technician Pune Zignat, was testing a new weapon, and Rex and Bly ventured closer to investigate. The weapon fired a missile, which, upon landing, exploded and began to obliterate all forms of life within range. Unnoticed, Rex and Bly narrowly escaped, and the Jedi and the clones noticed that the Confederacy forces were heading back toward the Lurmen colony, the only possible reason being to test the weapon on the colony itself.
Rex, Bly, and Skywalker kept the droid guards distracted while Aayla and Ahsoka sneaked into the base and take the watchtowers and droid along the wall. After Ahsoka opened the main Rex, Bly and Anakin took out the remaining droids. Rex and Bly then found shield generators and took them in their ship back to the Lurmen village. Rex and Bly then helped their Jedi commanders to set up defenses around the village. When Gen. Durd arrived he fired his defoliator but Lucky, Rex and Bly were able to power up the shields. When Durd sent in a squad Rex, Bly and the Jedi were able to hold their ground against the first wave, but when the second wave moved, Rex and Bly fell back to protect the shield generators and the Lurmen. Fortunately, Anakin was able to destroy the defoliator and capture Durd, and the Lurmen decided to help them. Rex and Bly then guarded Durd and his weapons technician as they put them on board the shuttle when the Republic fleet found them. 
Battle of Orto Plutonia
- "We've got to hold out!"
- ―Rex during the Talz's ambush on Orto Plutonia
Rex went with Anakin Skywalker and Obi-Wan Kenobi to Orto Plutonia to investigate the destruction of a clone security base. After war was declared between the local Talz and the Pantoran dignitaries, specifically the arrogant Chairman Chi Cho, Rex was ordered to protect Chairman Cho at all costs. The Chairman then ordered Rex to attack the Talz when they approached them, but Rex stated that they were only there to protect him. However, he was forced to attack when the Talz attacked them, riding Narglatch, and the Chairman was severely injured. Rex carried him to safety, holding off the attacking Talz until the arrival of the Jedi and Senator Riyo Chuchi. Chairman Cho died from the injury, and Senator Chuchi established a peace treaty with the Talz.
Battle on Naboo
- Jar Jar: "Ima gonna be trained!"
- Rex: "I am not training him."
- ―Rex insists he will not train Jar Jar to use a blaster[src]
When Senator Padmé Amidala and Representative Jar Jar Binks were captured while searching for a secret Separatist lab on Naboo, it was up to Anakin, Obi-Wan, Ahsoka and Rex to rescue them. They succeeded, and also stopped Dr. Nuvo Vindi from releasing the deadly Blue Shadow Virus. Unfortunately, Vindi's assistant droid took one of the virus containers and put it into a bomb. The droid then detonated the bomb, which quickly spread the virus throughout the bunker. Anakin and Obi-wan were outside with the scientist when the virus was released, so to save their companions, they went in search of an antidote on Iego. The virus almost killed everyone inside, including Rex, Ahsoka, Padmé, and several other clone troopers, but fortunately the Jedi found the antidote in time, and all infected were cured. As Rex was being led away on a stretcher, he overheard Obi-Wan telling Jar Jar that Senator Amidala had recommended that they give him training to hone his skill with a blaster. Jar Jar was ecstatic, but Rex flatly said he wouldn't train him.
Battle of Ryloth
- "I wish General Skywalker had discussed this plan with us. The odds are very much against us."
- ―Captain Rex to Ahsoka
After Techno Union leader Wat Tambor gained control of Ryloth and its inhabitants, Rex was sent with Anakin, Ahsoka and Admiral Yularen to destroy the blockade and clear a way for the invasion forces to land. Unfortunately, after Ahsoka led a squadron of fighters, Separatist reinforcements arrived, and she disobeyed a direct order to retreat and aid the cruisers. The Resolute was damaged, and Admiral Yularen was severely injured, and Ahsoka finally returned, but lost half her battle group along the way. After the Republic forces had retreated, Anakin tried to console a dejected Ahsoka. Rex reported that General Mace Windu was requesting a progress report. Anakin then commented that they hadn't made any progress, but went with Rex to deliver their report.
Even with only half his forces remaining, Anakin was ordered to continue his attack. Anakin sent Rex to find Ahsoka, who found her in the medical bay, apologizing to an unconscious Admiral Yularen. Anakin then devised a plan to pilot the Defender alone and ram it into the lead control ship, leaving only out maneuverable droids in command of the blockade. Rex supported Ahsoka, who was still shaken but left in charge of retrieving Anakin in addition to destroying the rest of the blockade. While devising a plan of attack, Rex was hesitant about Anakin's plan, and tried to support Ahsoka's inexperience with command, but at the same time looked at the reality of the situation. Ahsoka, still hesitant, devised a plan to angle the hull of the Resolute toward the blockade, acting as a screen to launch the fighters, and the support of Admiral Yularen boosted her confidence when the navigation officer was doubtful of the plan's chance for success. The plan worked, and after Ahsoka led a successful attack on the remaining frigates in the blockade, the invasion forces arrived, and she dispatched Rex to send a shuttle to retrieve Anakin's escape pod.
Shortly after the planet was liberated by the Grand Army of the Republic, Rex, Torrent Company, and their Jedi commanders were charged with ridding the planet of the remaining droid presence. Rex, along with sergeant CS-2207—Boomer—went on an AT-RT night patrol around the city of Resdin. The two clones eliminated a large number of battle droids, but were ambushed and taken captive by bounty hunter Cad Bane. Bane needed the clones alive to protect the gravity weapon he had recently stolen from the CIS, from the battle droids ordered to retrieve it. While they were unconscious, Bane had fitted the clones with binders wired with explosives and promised to let them go free if they cooperated with him, but threatened to kill them if they refused or tried to double-cross him. Under the circumstances, Rex and Boomer had no choice but to agree to the bounty hunter's demands. Together, they defeated several waves of attacking droids and a Separatist Vulture fighter, until Anakin Skywalker and Ahsoka Tano—having tracked Rex's signal—arrived to help.
Bane attempted to hold the Jedi at bay, again threatening to detonate the explosives in the binders around the clones' wrists, but Skywalker masterfully cut the binders off with his lightsaber, removing Bane's only bargaining chip. Effectively captured, the Jedi ordered Rex and Boomer to disarm him. With the tables now turned, Bane was forced to cooperate, and with the hangar they had been fighting in about to collapse at any second, the Jedi and clone troopers decided to use his transport, The Sleight of Hand. Bane was forced to carry the weapon to the ship while the Jedi guarded him and Rex and Boomer went ahead to scout out an elevated position from which to provide covering fire and clear the way for them. As the two clones left the hangar, they traveled alongside a path that overlooked Ryloth's wastes. After destroying another Tri-droid roaming the wastes, the clones were assaulted by waves of battle droids coming down from a nearby hill. Leaving the hill, Rex and Boomer encountered a pair of Tri-droids emerging from within a tunnel. Using rocket launchers, the clones destroyed the massive droids and continued on. At the ship, the Jedi were ambushed by the Skakoan Kul Teska, the creator of the gravity weapon, and a fight ensued in which the Jedi were eventually trapped within an energy bubble until Rex and Boomer arrived for help. Faced with an ultimatum—save their Jedi commanders or kill Teska—the clones decided to chose to rescue the Jedi, allowing Teska to escape in Bane's transport, taking the gravity weapon, and Bane himself, with him.
- "Come on, grunts! We are leaving!"
- ―Rex to his troops
At some point after the Battle of Ryloth, the Galactic Republic launched an assault on planet Felucia but was ultimately defeated by General Grievous's forces. When the outnumbered Republic forces in Felucia asked for help, an evacuation fleet under the command of Jedi High General Plo Koon went to the system, and Rex and Clone Commander Cody evacuated their clone troopers from certain defeat. Before escaping to Coruscant, the Republic had to evacuate Commander Ahsoka Tano's forces. After that, Rex was moved to Coruscant for a while.
Rex participated in the Battle above Devaron. Rex supported Anakin Skywalker's tactic of deploying AT-TE's from space onto a Separatist ship. After landing on board Rex fought against droids and Cad Bane to try to rescue Bolla Ropal. Their efforts failed and Bolla Ropal was killed. Anakin and Ahsoka told Rex to get transport off the ship while they went after Bane. Rex made it to the hangar bay but required the Jedi's help to secure the ship. After picking up Bane in Denal's armor they escaped the exploding ship. After returning to the Resolute Rex discovered some blood that was not from a clone on the back of there transport. The blood was revealed to be Bane's, who managed to escape in stolen clone armor.
Second Battle of Geonosis
Rex was the officer for General Skywalker's force in a three-pronged attack on a Separatist shield generator on Geonosis. When all the gunships were shot down Rex, Anakin, and Ahsoka destroyed a heavily armed fortification and met with Generals Obi-Wan Kenobi and Ki-Adi-Mundi and Clone Commanders Cody and Jet. They then destroyed the shield generator. They then needed to destroy the droid factory the shield generator was protecting. Ki-Adi-Mundi and Obi-Wan left to recover , but Luminara Unduli and her Padawan, Barriss Offee, joined the attack. The Padawans went into the factory via an underground network common in Geonosian architecture to blow the reactor. Meanwhile, Rex, Luminara, and Anakin distracted Poggle the Lesser's droid forces. A new tank design was unleashed by Poggle, but both Rex and the Padawans succeeded. After, Skywalker, Unduli and Kenobi captured Poggle, Rex went with the generals to escort Poggle to Coruscant. Rex was the first one to hear from the padawans Barriss and Ahsoka after losing contact with them .
First Battle of Saleucami
When Jedi Master Eeth Koth was captured by Grievous, Rex went with Generals Skywalker and Adi Gallia to rescue him. Rex and a squad of clone troopers went on board Grievous' command ship and protected the exit, while the Jedi rescued Master Koth. When Anakin brought Master Koth back, Rex and one of his troopers helped Koth into the ship. After Grievous escaped to the surface of Saleucami,Rex, along with Jesse, Kix and Hardcase were sent by Jedi Master Obi-Wan Kenobi to try and find General Grievous in the wetlands. Along the way, Rex was wounded by a Commando Droid Snipers. Jesse told Kix to help Rex, but they couldn't do it in the open. In need of medical attention, the clones, carrying Rex on one of their speeders, went in search of shelter and eventually stopped at a small farm house where they were met by a Twi'lek woman named Suu at blaster point. Jesse said that they needed help and cover, which Suu soon granted them. While Rex was resting, he heard a noise; he grabbed his blaster, but was disarmed by Cut Lawquane. Afterward Cut invited Rex to eat dinner with him and his family. Rex and Cut argued about the war and a clone's role in it. Later when Cut's children, Jek and Shaeeah, activated an escape pod full of Commando droids, Rex helped Cut defend his family from the droids and destroyed several of them. Rex was later contacted by Kenobi and he set out to rejoin the group, saying that Cut was still a deserter, but certainly not a coward.
Defense of the Coronet
After Kenobi's investigation on Mandalore, Rex, Anakin, Cody and their troopers were assigned with Kenobi to defend Duchess Satine aboard the Coronet against the Death Watch. Kenobi and Skywalker briefed Rex, Cody and their troopers of the importance of the safety of the Duchess. Rex and Cody, along with their troopers then went on patrol in the ship's cargo hold. When Rex lost contact with 2 of his troopers, Skywalker came down to help find them. Rex, Anakin and Cody then found a open container. They then went to search for the contents. When Anakin was attacked by Assassin probe, Rex, Cody and their men destroyed it. Unfortunately one of the probes made it to the lift. After that the fallen probe released smaller probes. Rex, Cody and Anakin stayed close to each other till they destroyed the smaller probes. Rex, Cody and Anakin then went to find the droid in charge of the cargo manifest, to see who brought the assassin probes on board. After Anakin informed Kenobi that one of the senators was a traitor, Rex, Cody and Anakin then looked for the last assassin probe. When Rex and Cody found one of their troopers helmets, one of the smaller probes leaped at them. Fortunately Anakin and R2-D2 save both Rex and Cody before it killed them. When they found the last assassin probe, it tried to kill Rex with it's claws, but Rex was able to use his hands to hold it back. When Anakin cut it's legs, Rex jumped on it and shot it. After that the traitor Senator Merrik contacted Death Watch's commander, who sent three Separatist boarding crafts to help him. After they attached to the Coronet, they unloaded super battle droids. While obi-wan was trying to save Satine, Rex, Anakin, Cody, and their troopers along side Satine's bodyguards fought against the super battle droids. They were able to defeat them and Kenobi, thanks to Anakin killing Merrik, saved Satine and the ship from certain destruction.
Battle of Malastare
- "We just need to hold them back until the bomb drops."
Rex served on Malastare to battle a massive invasion force sent by the Confederacy of Independent Systems. The Republic tested a prototype electromagnetic pulse weapon, the electro-proton bomb, which was designed to disable all battle droid forces while leaving the Republic troops or native Dug warriors unharmed. Rex and his troops were charged with holding the line of defense long enough for a flight of bombers to deliver the weapon and disable the droid army.
The bomb was successful in disabling or destroying all of the enemy force. Despite its efficacy, the power of the bomb's explosion created a seismic reaction which opened a sink hole at the point of impact. The sinkhole claimed much of the remaining Republic units; Rex narrowly avoided this fate, making an escape to solid ground. The explosion also awakened a hibernating Zillo Beast, a species long thought to be extinct. Doge Nakha Urus, the leader of the Dug people, insisted that the Republic help them destroy the creature or he would not sign a treaty which would provide critical fuel needed to power the Republic's war machine. The Jedi were opposed to killing a unique creature and instead found a way to force it into unconsciousness for transport to a safe location off-planet. With the successful elimination of the Zillo Beast threat, Rex was present as Urus signed the Treaty of Malastare.
Zillo Beast Rampage
- "A lot of the General's plans involve falling."
After the Jedi brought the Zillo Beast to Coruscant, it escaped and rampaged across the city. Rex was among the clone troopers trying to impede the Beast. When Anakin Skywalker, Padmé Amidala, and Chancellor Palpatine were captured by the beast, Rex pointed out Anakin's plan to slice their ship in half to escape. When Obi-Wan reminded Mace Windu to catch them when they fell, Rex remarked that a lot of Anakin's plans involved falling. Rex was watching when LAAT gunships launched Malastarian oil-filled gas bombs at the Zillo Beast and incapacitated it.
Some time after their first attempt to attack the clone facilities of Kamino, Asajj Ventress and Grievous planned to attack the planet again, but the Republic intercepted communications regarding the ambush shortly before this. Rex led the 501st back to their homeworld to defend it from the Separatist forces. During the battle, Rex once again fought alongside Commander Cody, who accompanied Rex to the barracks, where they found the surviving troopers from the Rishi moon outpost, Fives and Echo, along with several cadets and the malformed clone 99. Together, the clones defended the barracks from the droids using supplies from the armory. However, when they ran out of grenades, 99 went to restock, but the battle droids killed him. After the battle, Rex and the other clones honored their fallen brother, recognizing him as a true soldier. Rex and Cody later announced to Fives and Echo that they were to be officially designated ARC troopers for their courageous actions defending their home.
Responding to the distress signal
Later in the war, Rex was dispatched to meet Anakin Skywalker, Obi-Wan Kenobi and Ahsoka Tano to investigate a 2,000 year old Jedi distress signal. Believing it to be a Separatist trap, Rex was sent aboard a heavily armed destroyer where he contacted the trio from the vessel to report an anomaly on the ship's scanners. He subsequently lost connection with them and was not able to regain contact. It was later divulged that the distress signal had been from the mysterious Father to lure Anakin to his planet of Mortis so as to ascertain if he was the chosen one, and had disrupted Rex's communications. A moment later in Rex's time, the signal to the Jedi was regained. Rex was confused when Skywalker told him that they had been gone for more than a moment, but remarked that Rex would not believe it if he told him.
Rescuing Master Piell
After Jedi Master Even Piell was captured, Rex attended Master Plo Koon's briefing via hologram. Their mission was to rescue Master Piell from the impregnable prison known as the Citadel. During the briefing, Rex questioned if Master Piell would still be alive and was reassured that, since he carried valuable information about the Nexus Routes, the Separatists would not execute him.
After the briefing, Rex met up with Skywalker, Kenobi, Cody and the rest of their team in the Jedi Temple hangar. Rex was then frozen in carbonite with the rest of the team in order to avoid sensors. Their transport shuttle was able to traverse the outer defenses and land in a cavern near the Citadel. After the team was thawed out, they traveled towards the Citadel. During a hazardous traversal of a sensor mine field, team member Charger was detected, alerting the Citadel's warden, Osi Sobeck, to their presence.
On their way to Master Piell's cell, Rex, along with ARC Troopers Echo and Fives, disabled cameras and wall turrets along the way. After they freed Master Piell, Rex and the rest of the team then went to free Piell's captain. They were then ambushed by commando droids. Rex and the rest of the team were able to defeat the first wave of commando droids, but when a second wave of commando droids arrived, Sobeck activated magnets in the ceiling which attracted Rex's guns, effectively disarming him. Rex fought with his bare hands until Skywalker disabled the magnetic fields and the team was able to regain arms. After Piell's officers including their captain, Wilhuff Tarkin, had been rescued, Rex assisted in creating a diversion. Skywalker located an ancient cave mentioned in the archive data, and Rex took cover with his companions.
More super battle droids and droid commandos attacked the team from behind, and a commando droid equipped with a hand-held shield generator, opened fire on the Rex and the clones. Ahsoka Tano managed to do away with the unit and secure an escape route. The route, however, went through a pocket of blaster-inhibiting gas. At the rendezvous point for the evacuation, the group were once more set upon. However, reinforcements arrived and, using the tunnel's hatch as cover, Rex and the group managed to escape from the pursuing droids. Skywalker deployed a thermal detonator inside the tunnel, causing a massive explosion and destroying the droids present.
After realizing that the evacuation was aborted, Rex and the others proceeded to head for the landing pad where R2-D2 was supposed to pick up Kenobi and his team. Kenobi, his team, R2 and his droid squadron were already engaged in a firefight with crab droids, droid commandos and B1 battle droids. The team immediately rushed to the landing pad to aid Kenobi and his team. However, they failed to protect their ship and it was destroyed, killing Echo in the process. Rex and the remaining team then retreated to the caverns below the Citadel and waited for reinforcements, which Kenobi had called earlier. The team proceeded to a small island in which Plo Koon would rescue them. When descending a cliff, a clone trooper and a naval officer were killed, and R2-D2's battle droid squad sacrificed itself. Desperate to catch the escapees, Osi Sobeck released a pack of Anoobas to hunt down the team. In a plan to ambush the Anoobas, Master Piell was killed. Rex watched as the Jedi held a funeral to him, and then continued on. When they reached the island, Rex warned the team of Osi Sobeck coming in with a squad of STAPs. In the battle, Fives shot down Osi Sobeck, who almost killed Tarkin, but was rescued by Ahsoka. Plo Koon then arrived and rescued the group, including Rex, and the team departed Lola Sayu.
Return to Felucia
Rex, along Skywalker, Ahsoka, Gen. Plo Koon, and Commander Wolffe then returned to Felucia to neutralize an enemy outpost that had been reinforced by Grievous. While Ahsoka and Plo Koon's teams infiltrated either side of the outpost, Rex, Skywalker, Felucian scouts, and the rest of the clones held position so that Turbo Tanks and AT-TEs were able to open fire on the droids camped at the base. Rex, Skywalker and their men then ambushed the droids, assisting in Master Koon's mop-up operation. After this, Rex helped Skywalker in his search around the base for Ahsoka, who had gone missing during the fight. The expedition was then ended.
Second Battle of Mon Calamari
Battle of Umbara
Rex, along with General Skywalker and the 501st were sent to Umbara to take the Capital. Rex and Skywalker's troops would take out enemy reinforcements striking against Generals Obi-Wan Kenobi, Pong Krell and Saesee Tiin joint attack. After Rex, Skywalker and the rest of the 501st landed, they and the AT-RTs made their way to the rally point on a ridge. Rex and Skywalker rested their forces. The Umbarans then launched a surprise attack from their rear with Millicreep Assassin droids. After Skywalker called for a bombing ridge, Rex then had the 501st fallback away from the ridge as Commander Oddball bombed the Umbarans.
After that, Krell arrived and told Skywalker the Supreme Chancellor requests that Skywalker return to Coruscant and to turn command of the 501st over to Krell in the interim. Krell then told Rex to prepare the battalion for the march on the Capital. Along the way, they were attacked by a couple of Banshees. After Krell killed both of the banshees, Rex then asked Krell if his men could take a break to which Krell refused to so, knowing that time is not luxury the Republic can not afford. When Rex, Krell, and the 501st reached the outskirts of the Capital, Krell orders the troops to launch a full frontal assault instead of using preemptive surprise attacks despite Rex's disagreement with Krell's plan. Nonetheless, Rex complied with the order and then led his troopers and AT-RTs onto the main road to assault the capital.
As Rex and the 501st marched along the road, they then ran into a field of mines, killing a couple of troopers. After making their way through the mines, Rex and the 501st then got caught in an ambush led by the Umbaran Militia. Rex and the 501st held their ground but were too exposed to hold out for long. Rex then ordered the 501st to retreat in order to gain a better fighting position. Rex and his were then able to rejoin Krell and the rest of the 501st. Together they were able to repel the Umbarans. After that, Krell criticized Rex for giving up the road. Rex and Fives were able to convince the general that they did what was best for their men. After Krell gives Rex a dubious compliment, he, Fives, and the rest of the 501st continue to hold against a Umbaran counterattack.
Capturing the Airbase
Rex, Krell and the 501st continued holding their ground against the Umbaran ground and air forces, but could not break through to support Gen. Kenobi's battalion. After Krell was told by Kenobi that a Umbaran airbase was resupplying the capital, Rex, Krell and the battalion were tasked to take the airbase.
When Rex, Krell and the 501st got within distance of the airbase, Rex suggested that they try and scout for another way in. Krell, knowing the urgency of Kenobi's situation, ordered Rex to take the 501st through a gorge single file. Rex's men then started to criticize Krell's orders and tactics knowing that their casualties would be high, but Rex was able to convince them to go through with it. As Rex started the attack, he divided his men into three groups with Fives, Hardcase, and Rex in charge of each one of these groups. As Rex and the 501st make their way through the gorge, they were attacked by huge caterpillar tanks. Fortunately, their rocket launchers and Thermal detonators were able to subdue the caterpillar tanks. Rex and the 501st then resumed their advance towards the airbase, with Rex shooting a Umbaran soldier and a couple of banshees. Rex then spotted a couple of Spider cannons coming towards him and the 501st, and they are forced to retreat. Rex is then ordered by Krell to push the attack. Rex's men tried using rocket launchers on the spider cannons, but to no avail.
Rex orders Fives and Hardcase to acquire a couple of Umbaran starfighters and use them against the tanks. However, Krell ordered Rex to launch a full-scale attack, regardless of this plan. Rex and his troopers continued to hold their ground against the tanks. Just as Rex tried to use a rocket launcher on one of the Spider cannon, Fives and Hardcase then arrived in a couple of starfighters, which were able to destroy the tanks and Krell was then able to send in the rest of the battalion to successfully take the airbase. Krell then told Rex that luck smiled on him today, despite a lot of men dying to take it.
Attack on the supply ship
Rex, Krell and the 501st continued holding the airbase against the Umbarans who were trying to retake it. Rex was with Krell when General Kenobi contacted Krell to inform him that the capital was still receiving supplies, this time from a Separatist supply ship in the atmosphere. Rex suggested that they should try and destroy the supply ship. After Kenobi's transmission was lost, Rex was ordered to have the battalion ready to move on the capital in 12 hours. Though Rex wanted to try and coordinate their attack with Kenobi's battalion, Krell knew that Kenobi was busy and said no, but Rex protested, informing Krell that they would be walking into a blast zone. Krell then ordered Rex to ready his troops, commenting that although Rex had disagreed about his strategies, he is loyal enough to obey his orders.
After Rex briefed his troops, ARC Trooper Fives informed Rex that they had broken the Umbaran access codes and that they could use the captured starfighters to infiltrate the supply ship and destroy it, thus cutting off supplies to the capital. Rex forwarded the plan to Krell, but Krell refused to waste men on the plan, claiming they will need everyone to help take the capital. Rex then informed his troops that the attack on the capital will go on as planned, drawing more criticism from Fives about Krell's leadership abilities. He also insists that they continue with the sneak attack regardless of Krell's orders.
Later, after Rex left the barracks, Fives confronted him about standing up for Krell's plan. During their discussion, a conflicted Rex tried to convince Fives that they are honor bound to follow orders without question for the good of the bigger picture. A disgusted Fives told Rex that he won't follow orders he considered wrong and allow others to suffer as a result. He then stormed off, telling an unhappy and torn Rex that he was going to find some accomplices to help with his plan. After Fives and Hardcase wrecked one of the Umbaran fighters trying to figure out the controls, they decided to still continue with the plan.
Fives contacted Rex one last time, to give him one last chance to recall them; Rex implicitly gave them permission but warned them if they were caught he could not help them. Rex then watched as Fives, Jesse and Hardcase took off towards the supply ship. When Krell found out about the three ships and demanded what they were doing, Rex told him that it was merely a reconaissance mission. He also managed to turn Dogma and Tup away from Krell so they couldn't rat out the three.
After Hardcase destroyed the supply ship by sacrificing himself, Rex met up with Fives and Jesse after they landed. Rex, along with Fives and Jesse, are confronted by Appo and some other troopers and then taken to see a furious Krell. Rex tried to take the blame for the mission in order to protect Fives and Jesse, but Fives insisted that it was his idea to try and protect Rex. An unforgiving Krell informs Fives and Jesse that they will be court-martialed and executed.
- "What's the point of all this? I mean... why?"
"I don't know sir. I don't think anybody knows. But what I do know, is that someday this war's gonna end."
"Then what? We're soldiers. What happens to us then?"
- ―Rex and Fives
After the event in which Fives, Jesse, and Hardcase disobeyed Krell's orders, Rex tries to talk Krell out of court-martialing Fives and Jesse and tells him there is no need and that the troops are with Krell. The men just feel that Krell is putting their lives in danger needlessly. Krell only replies that the the court-martial is needed to show the clones who is in charge. After a short lived talk, Krell decides that the execution of Fives and Jesse will be more effective than court-martialing them. He orders Rex to prepare a squad for execution. Shocked, Rex tries again to reason with the general, only to be yelled at. Doing as he is told, Rex retrieves Fives and Jesse from their prison cells. Rex tells them that he tried to reason with Krell with no success. Rex and the other troopers set them up along the wall of the airbase. As the execution team prepares to fire, Fives stops them and says that what they are about to do is wrong and that they should not listen to Krell's order for execution. The troops begin to wonder if Fives is right. But not caring at all, Dogma orders them to fire. The troopers fire but avoid hitting Fives and Jesse. Dogma begins to question why the troopers didn't kill Fives and Jesse, only for Rex to step in and tell him that their actions in destroying the supply ship was heroic and that if all clone troopers in the 501st legion were rewarded with execution for heroic actions, then one day they would be all dead. Rex then has Fives and Jesse untied.
Krell is furious to hear that the clones didn't kill Fives and Jesse and yells at Rex for it. An incoming message then comes through and a clone trooper reports that the Umbarans have stepped up their defenses and have recently attacked a platoon and stolen their armor and weapons and have also disguised themselves as clone troopers. Krell puts the execution on hold and orders Rex and his men to prepare to march on the capital and reminds him to tell his men that the enemy has now disguised themselves as clone troopers.
Rex then leads the battalion to attack the disguised Umbarans. When Rex and the rest of his men then come under fire from the disguised Umbarans, the troops then set up their mortars and opened fire on the enemy. The firefight between both sides continued till Rex discovered that they were actually clones. Rex then orders his men to stop firing, telling them to take off their helmets to see that they were all clones. Both sides revealed themselves to be clones. Kix then found the 212th battalion platoon leader, Waxer who was mortally wounded in the firefight. Rex then asks Waxer who gave the order to attack them. Waxer tells Rex that Krell told his platoon that the Umbarans had stolen clone armor. Waxer then sheds a tear before he dies. Rex then rounded up his men and the remnants of Waxer's platoon. Rex tells them that they are going to arrest Krell for treason against the Republic. Rex then tells them that if anyone did not wish to do this, to step out of the line. All of Rex's men stepped forward to arrest Krell.
Rex, the battalion and Waxer's platoon prepare themselves to arrest Krell. Rex then frees Fives and Jesse, giving them back their armor and weapons. Rex and his men then go to the control tower to confront Krell. Rex then states that General Krell is relieved of his command. Krell's tells them that his men are committing mutiny. Krell then admits he did tell his men to kill each other. Just as the clones close in on Krell, Krell subdues them, killing some them with his double bladed lightsabers and then escapes in to the jungle. Rex then orders his platoons to go into the jungle and find him. Dogma, remaining loyal to Krell, tries to stop his brothers, calling them traitors. After Rex convinces him to stand down, Dogma is then taken to the brig. When Rex and the rest of his troops go into the jungle, Krell subdues one of the squads. Krell, using the Force, taunts Rex and his men, saying that he has been using them all along, laughing at them. Tup then has Rex lure Krell over to him. When Tup manages to lure Krell's attention from the rest of the clones, the general then runs into a Vixus. Though Krell is able to free himself from the Vixuses grasp, he is then stunned by Tup, then the troops places a pair of binders on his hands and is then taken into custody.
When Rex questions Krell about his actions, he admits that he has turned traitor and tells Rex that he foresees that the Jedi will lose the war, that a New Order will arise, and that in exchange for betraying the Republic, he will become Count Dooku's new apprentice. Rex then discovers that Krell had sabotaged the airbase's communications and that Gen. Kenobi's battalion had long since taken the capital. Unfortunately the Umbaran forces are on their way to retake the base. Rex then orders the battalion on full alert. When Fives warns Rex that if Krell is freed, he would undermine the Republic's foothold. So Rex decides to execute the fallen general. Rex and Fives then go down to the brig and let Dogma out. Rex then tells Krell to face the wall and get down on his knees. Krell taunts Rex that's he afraid to pull the trigger. Just when Krell finishes his last taunt, Dogma takes one of Fives's pistols and shoots Krell for betraying every one of his men. Rex then gets word that Kenobi's battalion have all sectors secured and that the enemy has been defeated, securing Republic victory on Umbara.
Battle of Kiros
After the Separatists occupied the Togruta colony world of Kiros, Rex, along with Generals Skywalker, Kenobi, Commander Ahsoka and Cody went to Kiros to liberate the planet. Rex rode in a BARC speeder sidecar with Gen. Kenobi along side Skywalker, Ahsoka, and the rest of BARC speeder squad. Rex, like Ahsoka, noticed that the colonists were missing. Rex found this worrisome since the Separatists were not hesitant to use civilians as living shields. After they took out the commando droids on Flitknot speeders, Rex then finished off one AATs with his rocket launcher. Rex, Cody and the rest of forces then surround the Separatist headquarters in the governor's tower. Though the Zygerrian Separatist commander, Darts D'Nar, tried to set off numerous bombs in the city, Skywalker and Ahsoka were able to disable the bombs. Though they were able to capture D'nar and his ship, the entire planet's Togruta population had been taken into slavery by the Zygerrians.
- "I'm no Jedi."
- ―Rex upon killing keeper Agruss
Following the battle of Kiros, Rex, along with with Anakin Skywalker, Obi-Wan Kenobi, and Ahsoka Tano, infiltrated the slaver world of Zygerria to locate the missing colonists. While Anakin and Ahsoka distracted the queen, Rex and Obi-Wan searched for any of the colonists. They found the leader of the colonists, Governor Roshti, and attempted to escape with him on a brezak. The Zygerrian guards shot at them, and knocked Obi-Wan and the governor off. Rex escaped, and later when Obi-Wan was to be executed, helped Anakin save Obi-Wan and stop the Zygerrians. Rex was incapacitated by an explosion however, and he along with Anakin, Obi-Wan and Ahsoka were captured by the Zygerrians. Rex and Obi-Wan were sent to the Kadavo slave processing facility on the planet of Kadavo and forced to work in the furnace room. Later, when Dooku ordered Obi-Wan's execution, Rex was taken along with him to the base's control room. When Anakin and Master Plo Koon caused a distraction for Obi-Wan to escape his binders, Rex attacked the Zygerrian guards with him. After defeating all the guards, Obi-Wan had slave keeper Agruss at the end of his lightsaber, but the Zygerrian mocked him, saying that a Jedi would never kill an unarmed man. To this, Rex picked up a Zygerrian spear and threw it at the keeper, killing him. Rex then escaped to the Republic fleet with the remainder of the group.
Aiding the Onderon Insurgency
- "They're not what I'd call shinies, sir."
- ―Rex upon seeing the Onderon Insurgency base.
Some time after infiltrating Zygerria, Rex, once again with Anakin Skywalker, Obi-Wan Kenobi, and Ahsoka Tano, went to the Seperatist world of Onderon to aid the insurgency resisting the droid occupation. Helping to train the ragtag militia how to fight the droids, he later aided in infiltrating the city to take out the droids at the source. After completing the rebel's training and oversaw their infiltration of the city, Rex returned to Coruscant with Kenobi and Skywalker, leaving Commander Tano in charge of guiding the rebels and overseeing their progress.
Chasing a Jedi
- "I know Commander Tano. She would never do something like this."
- ―Rex, after Ahsoka Tano was accused of killing clone troopers
Rex fought with Anakin Skywalker in the Battle of Cato Neimoidia. During this battle, Skywalker was ordered to return to Coruscant to investigate the Bombing of the Jedi Temple Hangar. Later, after Ahsoka Tano had been imprisoned for murdering Letta Turmond and had escaped, Rex helped Skywalker try to recapture his Padawan. It was believed that Tano had killed several clones in her escape from the Republic military base, but Rex did not believe his longtime associate would have done such a thing. Rex helped Skywalker and Captain Fox chase Tano through the base, into a nearby industrial area, and eventually, into a system of pipes. Rex found Tano and Skywalker together in the pipes just in time to see her jump from the pipe into a Coruscant Underworld portal.
Later, after Tano was seen the Coruscant underworld police on Level 1312, Rex went with Skywalker in a Republic police gunship to try to find her. As they were landing at terminal 24, Skywalker saw Ahsoka talking to Asajj Ventress. Skywalker jumped off the gunship after them, but the pair escaped. Later, Rex received word of a disturbance on Level 1315. Rex and Skywalker went to investigate and found Tano stunned by Commander Wolffe in a warehouse full of nano-droids.
Armor and equipment
Rex's armor used the color design that the entire 501st Legion had in 19 BBY, though the armor itself was still Phase I armor. He also wore a kama and pauldron, and his helmet displayed Jaig eyes. He carried twin DC-17 hand blasters but also utilized the more standard blaster rifles. His helmet featured a rangefinder, which was a tool more common among Advanced Recon Commandos. When required, Rex would also wear jetpacks or other mission-specific gear, such as customized clone cold assault trooper armor.
When the Phase II armor was issued to the clone troops, Rex saw it as an inferior replacement to the original Phase I: believing it to be more prefabricated, Rex took his original Phase I helmet, cut it out and welded it together with the parts of the Phase II he felt were an improvement, such as the breathing filters and communication systems. The remaining aspects of his armor, however, were swapped out for the Phase II variants. His armor also featured tally marks and welding marks on his helmet and chest and kept the same blue color layout as his Phase I armor.
Personality and traits
- "In my book, experience outranks everything."
Rex summarized his philosophy be asserting that experience outranked everything. An independent thinker, he wasn't afraid to voice his opinion to higher ranking officers, but still obeyed orders from his superiors under all but extreme circumstances. Rex was also very tactful, adept at diffusing tense or embarrassing situations. Because of his close relationship with General Skywalker, Rex learned to never underestimate the abilities of the Jedi, nor doubt their resolve.
Trained in a variety of fighting styles and combat tactics, he was a skilled soldier, unafraid to place himself in danger if required for the line of duty. These characteristics enabled Rex to survive many engagements and lead his troops to numerous victories. Rex demonstrated sufficient mental strength to resist a mind trick from a force user of Asajij Ventress' caliber.
Rex thought very highly of General Skywalker, who also respected the captain and placed a high degree of trust in him. Both men held each other in high esteem, and though Rex would at times protest Skywalker's orders, he followed them to the letter. In turn, Skywalker placed high value on Rex's suggestions, at times giving the captain the prerogative during battle operations.
Rex was also able to deduce that Skywalker was in love with Padmé Amidala due to the clones' heightened sensitivity to minute personal details—such as overly long glances, a tendency to snap to attention at the mention of her name—developed by living among individuals who all looked the same. However, Rex believed the feelings were unreciprocated and did not suspect that the two were secretly married.
Rex was known to have a close relationship with Ahsoka Tano; the two often interacting on a first name basis or even by nicknames.  Initially a bit taken aback by her enthusiasm, Rex grew fond of the eager young Jedi, initially acting as a mentor and offering her advice and support, and sticking up for her when her competency was challenged by others. As Ahsoka gained experience, Rex grew to respect her as a capable and trusted superior. Despite this, he did not think much of her early choice of clothing, and found it very amusing when Gilad Pellaeon gave her grief over it. 
As with most clone troopers, he held a high amount of loyalty to the Republic and was determined to win the Clone Wars in the Republic's favor regardless of cost, believing that if they lost, the Republic's future descendents would live under an unimaginable evil. Ultimately, his efforts would prove to be for naught even after the Republic won the Clone Wars due to the Declaration of a New Order and the formation of the Galactic Empire.
Rex had a strong working relationship with Commander Cody, and appeared to be friends with the Commander, working closely with him during many of General Skywalker and General Kenobi's shared missions. While Cody was at times skeptical of Rex's originality and creative tendencies  he admired Rex's quick thinking abilities, and greatly respected the lower-ranked officer.
Rex was an avid bolo-ball fan, partial to the Sullustan team, Bylluran Athletic. When first arriving aboard RAS Leveler, he had his hair dyed blue and cut into stripes in support of the team making the finals.
Rex first demonstrated his own independence by allowing Cut Lawquane's desertion to go unreported, although he turned down Lawquane's offer for a chance to also desert and live at the farm. Rex was affected by Cut's family, however, and asserted that his loyalty to the GAR was rooted in a desire to defend people like his brother's family. He recognized that people like the Lawquanes were the reason why he fought, rather than because of his conditioning.
Rex believed strongly in the humanity of himself and his fellow clones. While he would not hesitate to follow his superiors on dangerous or costly missions, he would react fiercely if he believed his men were being disrespected or treated inhumanely.  Despite this, Rex still believed that it was the duty of a soldier to sacrifice his life for victory, if necessary.
After his encounters with Cut Lawquane and General Krell, Rex began to reject the belief that being a good soldier meant that he must obey his orders without question. Rex likened the notion of blind obedience to that of a droid's programming, and argued that, as individuals, he and his fellow clones needed to make their own decisions when they believed an order was wrong.
Behind the scenes
According to the film DVD's commentary, the creators at first had decided to put in Alpha-17, the ARC Trooper known from the Dark Horse Star Wars comics, as the series' prime clone character. However, Lucas objected because his inclusion would make too much of an alliteration (Anakin, Artoo, Ahsoka, and now Alpha), so a different clone character was created.
In the episode "Carnage of Krell," Rex was originally set to pull the trigger and kill Pong Krell. However, the writers decided that it was contrary to his character, and they chose Dogma to fill the role instead.
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