Star Wars: The Bad Batch is an American animated series based on the Star Wars universe.. KS-1409 or Echo - clone trooper serving in the Grand Army of the Republic during the Clone Wars. During the war, he was assigned to the 501st Legion by Captain Rex and became an ARC soldier.. Believed to have died during a mission to Lola Sayu, however, as it later turned out was captured and turned into a cyborg by the Techno Union. He was rescued from captivity by Clone Squad 99 and Captain Rex on the planet Skako Minor. Previously included in the Domino squad. He got his nickname because he repeated all the orders he received..