CT-5385, nicknamed "Tup," was a clone trooper who served in the 501st Legion of the Grand Army of the Republic during the Clone Wars. Like his fellow clone soldiers, he was created on Kamino from the DNA of bounty hunter Jango Fett. He was also given the same bio-chip as the other clones, containing Clone Protocol 66—a secret command that the Sith could use to force the clones into killing Jedi.