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He was a member Slick's platoon, which took part in an assault on Christophsis in which Republic forces tried to take back Christophsis after it had been taken by the Confederacy.
When being interviewed by Cody and Rex for being a possible Separatist spy, Sketch told to two officers that him and fellow platoon member Punch were in the mess hall and had nothing to do with betraying the Grand Army of the Republic. Rex and Cody eventually find out that it was Sergeant Slick who was the traitor. A fight ensued between Rex and Cody against Slick, and Slick was then taken into custody for being a spy against the Republic.