"Sketch" was the nickname of a clone trooper who served in Clone SergeantSlick'splatoon during the Clone Wars. In 22 BBY, he was dispatched with a Jedi-led contingent of the Grand Army of the Republic to liberate the planetChristophsis from the Confederacy of Independent Systems. Sketch joined his unit on reconnoitering the planet for a strategical ambush site, but the Confederacy was able to ambush the Republic forces. After the clone troopers returned to the base, Sketch and fellow trooperPunch went to the mess hall. When Clone CaptainCT-7567 and Clone CommanderCC-2224 interrogated the members of Slick's platoon to locate a possible Confederate spy, Sketch vouched for trooper Jester, and Punch and Sketch served as each other's alibis. Trooper Chopper claimed to have immediately gone to the mess hall, but Sketch objected and stated that he had come in later. However, Sergeant Slick himself was later revealed to be the turncoat and was apprehended.
When the battle droids discovered a crippled Christophsian and discussed killing the man, the clones intervened and eliminated the droids before returning to the base.[8] Later, Sergeant Slick's platoon was stationed in the South tower with General Kenobi and Clone CommanderCC-2224, while Skywalker and Clone CaptainCT-7567 were based with their troopers in the parallel North tower. The Republic troops prepared to attack the Confederate droids below, but the approaching droid column unexpectedly split in two, and battle droids arrived in the South tower and ambushed the clones. Skywalker and his men arrived in the South tower to reinforce Kenobi's group, and taking a turbolift to the roof of the tower, the Republic forces escaped in clone pilotHawk'sLAAT/i gunship.[3]
After the Republic forces had returned to their base, Sketch and fellow trooper Punch went to the mess hall,[3] which they habitually frequented.[1] During investigations regarding the possibility of a Confederate spy amongst their ranks, CC-2224 and CT-7567—nicknamed "Cody" and "Rex," respectively—traced an irregular wavelength in external communications to Slick's barracks. Suspecting that one of the sergeant's men was the turncoat, the two clone officers called the unit to individually interrogate them in the platoon's quarters. Sketch vouched for the nervous Jester and verified his alibi, and Punch and Sketch supported each other's claims that they had been in the mess hall. When trooper Chopper stated that he had been in the mess hall with them, Sketch refuted his claim, and with encouragement from Cody, Sketch revealed that Chopper had gone to the mess hall later. However, Slick was eventually revealed to be the spy, and escaped before severely damaging the Republic's gunships, AT-TE walkers, and weapons depot. The turncoat sergeant was spotted running into the base's command center, and Rex and Cody ordered Slick's platoon to secure the perimeter. The two clone officers later managed to apprehend the traitorous Slick.[3]
Sketch and his brethren discover Slick's treachery.
During the Battle of Christophsis, Sketch frequented the Republic base's mess hall with fellow trooper Punch to the point where it became a habit.[1] In the course of investigations into a possible traitor within his unit, Sketch verified Jester's claim, and noted Jester's "obsession" for always cleaning his blaster after every battle.[3] His keen observation skills helped Cody and Rex eliminate suspects and zero in on the real traitor.[1] When Chopper claimed to be in the mess hall, Sketch objected to his statement but then stopped. Only with persuasion from Cody did Sketch continue, and Sketch was later shocked when his own sergeant, Slick, was revealed to be the turncoat.[3] Sketch had a tattoo of the Aurebesh letter Senth, or "S," above his left eye.[2] He was trained for combat, and his clone armor's greaves were dingy with grime from fighting.[1]