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CC-5576-39, nicknamed Gregor, was a Clone Commando and the Captain of Foxtrot group. He crashed landed after the Battle of Sarrish on the remote planet of Abafar. He suffered Amnesia and forgot all from before, working for Mister Borkus. After realising who he actually was, Gregor helped D-squad escape the planet and seemingly sacrificed himself so they could escape. However, he survived and returned as he said he would and made his way back to the republic, being promoted to Commander at some point
Gregor, along with Captain Rex and Commander Wolffe didn't take part in Order 66, having removed their Control Chips and retired on Seelos in an old AT-TE Walker. Gregor's mind went a bit crazy from the explosion and he was crazy about catching Joopa's.