During a battle on Christophsis, Gus and the rest of his unit were setting up for ambush on the Droid army from a tower with Jedi General Obi-Wan Kenobi and Commander Cody. Gus then spotted the battle droids bring up AATs and were splitting up. The battle droids then stormed the tower and Gus was wounded. They were then saved by Jedi General Skywalker, Captain Rex and their men and then retreated to the roof top. Before being picked up by Hawk's gunship, Gus then took TJ-55's head back with him.
Gus and the rest of platoon were called to their barracks by Cody and Rex for questioning if someone among them were a spy, much to Sergeant Slick's chagrin. Gus then told them he was being treated for his wound after the ambush and that the medical droid would have the records. He then ganged on up on Chopper when he lied about his whereabouts. However, Slick was revealed to be the true spy and escaped. Gus and the others then went to the base's weapons depot and spotted Slick going into the command center after blowing up the depot.