Rex, or CT-7567, was a clone trooper captain during the Clone Wars. He personally commanded Torrent Company, part of the 501st Legion, a famous clone trooper unit in the Grand Army of the Republic. He served under Jedi General Anakin Skywalker and Jedi Commander Ahsoka Tano and lead the 501st Legion in many major battles such as on Christophisis, Teth, Rishi Moon, Saleucami,Kamino, Lola Sayu, Umbara, Mandalore, Scipio, Ringo Vinda and Anaxes. Later in the war, He sometime removed his inhibitor chip thus not following Order 66, along with Commander Wolffe and Captain Gregor. After the Clone Wars, He than resided in a modified AT-TE Walker along with Wolffe and Gregor. He was visited by the crew of the Ghost who was sent by Ahsoka Tano, his long time comrade to recruit him to the Rebellion.