CT-7567, nicknamed "Rex," was a veteran clone trooper captain who fought for the Galactic Republic and led the 501st Legion during the Clone Wars. 15 years after the end of the Clone Wars, Rex was still alive and was living in a modified AT-TE on Seelos with Clone Commando Gregor and Commander Wolf. After an encounter with the Galactic Empire, and being helped by members of The rebellion, Rex would join the Rebellion, becoming one of the main leaders of the rebellion, due to his knowledge of old abandoned Republic bases and outposts. Rex was also a close friend of Ahsoka Tano.

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