Commander Rex (birth number CT-7567) is a former clone trooper commander of the Grand Army of the Republic, who fought alongside Jedi Knight Anakin Skywalker and his then-apprentice, Ahsoka Tano (until she left the Jedi Order after being framed for bombing the Coruscant Jedi Temple and murdering Letta Turmond by Barriss Offee, the real saboteur). At the end of the war, Rex, Bo-Katan and Ahsoka; who had unofficially rejoined the order, led part of the 501st in the Siege of Mandalore, intent on capturing the renegade Sith, Darth Maul. They succeeded in capturing Maul, but on the way back to Coruscant, Palpatine issued Order 66, activating the clones' inhibitor chips that compelled them to follow all orders. While the rest of the clones, including Jesse, immediately tried to kill Ahsoka, Rex resisted his programming and told Ahsoka to "find Fives", who had died while trying to warn him about the conspiracy against the Jedi. Rex then began shooting at Ahsoka against his will, but she escaped. After being forced to free Maul to use him as a distraction, Ahsoka successfully removed Rex's chip, freeing him from its violent programming, although this also turned the rest of the clones against Rex. After he, Maul, and Ahsoka escaped the Venator-class Star Destroyer, all three of them faked their deaths. Rex went into exile on Seelos with fellow clones Gregor and Wolffe, who had also had their inhibitor chips removed. Rex is later recruited by the crew of the Ghost to join the Rebellion, and eventually fought in the climactic Battle of Endor.