Rex's programming and appearance were standard for the RX series. He had a segmented body with wider sections of burnished metal trimmed in gold and blue, and narrower sections in black. He had three arms with clawed hands, blue photoreceptors that glowed with a white light, a retractable blue visor, and a repulsorlift generator at his base to facilitate movement. Rex was friendly with organic beings, and he affected a brave demeanor even during his disastrous flight to Endor. He was in a romantic relationship with a fellow droid, ROX-N.
"Okay! I've always wanted to do this. We're going in!"
―RX-24, joining Red Squadron in an attack run on an Imperial battlestation[src]
Upon arrival at Star Tours from the factory, RX-24 was marked as defective.
RX-24 was an RX-Series pilot droid manufactured by Reubens Robotic Systems.[1] The droid was one of several purchased by the galactic travel agency known as Star Tours at some point before the Battle of Yavin in 0 BBY.[8] RX-24 was shipped to the agency defective; once removed from his shipping crate, the droid was almost completely non-functional, muttering random phrases in Basic, speeding up and slowing down his speech at irregular intervals, and sparking at the neck. With a decal reading, "DEFECTIVE" and "RETURN TO FACTORY" on his base, he sat outside his crate up to the time of Star Tours Flight 1401,[5] which took place at some point between 2 and 0 BBY.[8]
Rex's first flight brought him to an immense Imperial battlestation.
Rex took his post in front of the StarSpeeder's cockpit shield. Promising a smooth ride, the droid lowered the shield and greeted his passengers as his navigator, R2-D2, was loaded into the craft's astromechslot. With approval from control, Rex lurched the starship into motion but then took a wrong turn while still inside the spaceport. Unable to find the StarSpeeder 3000's brakes, he nearly collided with a wall before wrenching the craft up and over the obstruction and into space. Despite this inauspicious beginning, RX-24 then ordered R2-D2 to launch the craft into hyperspace.[3]
The pilot's next mistake was to come out of lightspeed too late, passing Endor completely and inadvertently moving the StarSpeeder into a field of icycomets instead. He deftly piloted the craft through the comet field only to emerge within a restricted combat zone, where several[3]New Republic[17]X-wing starfighters were in the midst of a battle with an Imperial Star Destroyer and its complement of TIE/LN starfighters. Rex found his passenger craft caught in the Star Destroyer's tractor beam, but a tip from one of the New Republic pilots to ease up on his main thruster allowed the droid to escape capture. The voyage nearly came to an end when an Imperial fighter shot the ship and caused it to lose altitude, but R2-D2 repaired the damaged stabilizer on the Captain's orders. Rex then moved the starship to join the New Republic's Red Squadron in an attack run against a massive Imperial battlestation. After following two X-wings through a giant trench and helping them shoot down enemy TIE fighters, Rex and his passengers saw that the attack was a success. Rex then ordered R2-D2 to take the craft to lightspeed; they returned to the spaceport from which Flight ST-45 had originated, scathed but intact.[3]
RX-24's flight proved something of a harbinger for the future of the Star Tours travel agency. Within months of the Battle of Endor,[18] accidents and poor management drove the company to go out of business.[12]
RX-24 was a standard RX-Series model, making him a second-degree droid,[3][2] that is, one of a category of droids who aided in spaceflight and vehicle or starship maintenance.[19] He possessed standard equipment for his model, including three clawed arms with which to manipulate starship controls, a heuristic processor[6] to facilitate learning and creativity,[20] two photoreceptors with which to see,[7] a repulsorlift platform at his base for locomotion, and a vocabulator with which to speak.[3][6] The droid was programmed with a masculine personality,[3] and he was able to speak and understand Basic and Binary.[6] Rex's photoreceptors were blue[4] unless illuminated, which made them shine with a white light.[3] The wider sections of his chassis were burnished metal trimmed with gold and blue; between these were narrower sections in black. Rex's clawed fingers, upper anterior facial plating, and vocabulator were also gold. The droid pilot had a retractable blue visor that he could lower over his photoreceptors.[4]
Upon his arrival at the Star Tours travel agency, RX-24 suffered from severe factory defects, sputtering random phrases and shorting out frequently.[5] Once restored to normal working order, Rex enjoyed the same programming as other RX units. He was skilled at starship piloting, ship maintenance, and computer use. His photoreceptors had great acuity to allow him to efficiently locate obstacles in spaceflight, and his dexterity enabled him to fly through dangerous situations.[7] Nevertheless, Rex had yet to become accustomed to actual spaceflight on his first mission; indeed, he exhibited some confusion and insecurity on the flight, nearly crashing the StarSpeeder 3000 and narrowly escaping several other hazards. Ultimately, his reflexes and daring allowed him to return to the Star Tours dock intact.[3]
Similarly, the fully functional Rex exhibited his model's ease of interaction with organic beings.[2] He was friendly and upbeat even in dire situations. When his first flight went awry, he tried to keep a professional veneer of calm, claiming that some of his mistakes had been intentional. Still, his anxieties manifested at particularly harrowing moments in screams and cries of exasperation. Despite his claims that he wanted to keep his passengers safe, RX-24 showed a daredevil streak on his maiden voyage; for instance, when he stumbled upon an Imperial battlestation, he chose to join a New Republic attack on it rather than retreat to safety. The pilot droid interacted smoothly with other mechanicals, such as his first navigator, R2-D2,[3] as well as RX-24's romantic interest, ROX-N.[11]
"Finding the right voice for 'Rex' was a real challenge. As a first-time pilot, much of the adventure was going to be an out-of-control wild ride. That meant he was going to be doing a lot of screaming!"
―Star Tours writer and producer Tom Fitzgerald[src]
Comedian Paul Reubens provided the voice of RX-24.
When Lucasfilm Ltd. and the Walt Disney Company teamed up to create an attraction for the Disneyland theme park in Anaheim, California, the two sides chose to use flight simulator technology to allow the park guests to feel like they were traveling into space on a passenger liner.[21] Creating the film to be projected to audience members proved a challenge, since all the drama had to come from either the visuals created by Industrial Light & Magic or from dialogue; the ride, therefore, needed a compelling and sympathetic narrator.[22]George Lucas proposed a droid pilot for the role to help connect audience members to the greater experience the ride was intended to mimic.[21] Lucas's original idea for the robot was to call him "Crazy Harry" and make him a sarcastic, wisecracking veteran of the Clone Wars,[23] an idea based on the skippers of the Jungle Cruise attraction in the park's Adventureland area in the 1980s.[21] However, the ride's director, Tony Baxter,[24] suggested the pilot be more of a jittery beginner and that the ride's harrowing narrative arise from the pilot's beginner's blunder; such a character would be more sympathetic, Baxter suggested.[21] The team ran with the idea, also making the robot a stand-in for the audience members. For instance, the team felt that the pilot's insistence on participating in an attack run on a Death Star—along with his exclamation, "I've always wanted to do this!"—would mirror the feelings of anyone who had seen Luke Skywalker's trench run in Star Wars Episode IV: A New Hope.[25]
The team then had to find a voice actor to perform the droid's lines. The idea that Rex had lost control of the StarSpeeder suggested the character would need to scream frequently on the audio track.[25]Tom Fitzgerald, lead writer and producer on the project,[26] and Mark Eades, media producer for the ride, have both claimed credit for eventually casting comedian Paul Reubens for the role.[27] Fitzgerald says that he thought Reubens might fit the bill after seeing the comedian's television special as the character Pee-wee Herman, a role that required Reubens to scream frequently and humorously. Fitzgerald felt the actor would fit the idea of a slightly comical, inexperienced pilot well.[25] Eades's version of the story says that in seeking a voice actor who could portray a "slightly cracked' character, they auditioned over two dozen talents, including Billy Barty and Frank Welker. When Eades heard Reubens as the voice of a robot spaceship in the Disney film Flight of the Navigator, he thought the comedian would suit the part. Reubens soon signed on to the project.[27]
Lucas provided basic ideas for Rex's physical appearance. Based on these, ImagineerChris Runco sculpted a prototype Rex puppet from green foam. Two other ride designers, Larry Sheldon and Lance Updyke, used this template to create the Rex puppets from aluminum. With four separate StarSpeeder 3000s that audience members might board in the attraction after its opening in 1987, four separate animatronic Rex puppets were also needed.[11]
RX-24's flight is chronicled in the Star Tours attraction at various Disney amusement parks.
The Star Tours ride spread to other Disney parks, which required more Rex puppets to be created. With the opening of Star Tours at Disneyland Paris, the designers added a new robot to the queue area of the attraction, ROX-N, whom they designed as Rex's girlfriend.[11] Expansion to new parks meant finding new voice talents for non-English versions of the ride; for Disneyland Paris, the company cast voice actor Luq Hamet to portray Rex.[28]
When Lucasfilm and Disney teamed up again to update Star Tours in 2005, designers decided to set the new version in the era between Star Wars Episode III: Revenge of the Sith and Star Wars Episode IV: A New Hope, well before the timeframe of the original ride.[29] To preserve continuity with the original ride, wherein Rex tells guests that it is his first flight, the team decided to create a new pilot. The droid AC-38 ("Ace") was the result, and the new pilot exhibits similar physical and behavioral features to Rex. Nevertheless, the newer ride's plot sees the protocol droid C-3PO replace Ace by mistake. As a nod to the original ride, the designers included an RX-24 animatronic puppet in the queuing area audience members must pass through as they wait to board the attraction.[30] There, the pilot-to-be is non-functioning and marked defective, uttering lines from the original Star Tours seemingly at random.[5]Star Tours: The Adventures Continue opened to the public in 2011.[31]