As Jonathan Bishop approached Arnold Jones (a.k.a. Hun) to recruit him to his cause, he was accompanied by two clones of the recently murdered Slash. Unlike the original Slash, these clones were created to be mindless, as Slash's strong intelligence had previously hindered his remote-control use by Bishop.
In City at War, part 8, the clone controlled by Bishop was killed in battle by Bebop and Rocksteady. But the other clone was freed from control when Hun's headset was removed. This surviving clone proved not so mindless after all, as it recalled Slash's memories upon hearing a trigger phrase. As soon as he spotted Bishop's crippled exo-suit on the floor, this Slash recalled the memory of when Bishop forced him to kill Bishop's own father, and he promptly repeated his action, this time crushing the younger Bishop to death under his foot. The apparently sapient Slash was soon recognized by Leonardo. Having been shot at point-blank range by Bishop before his demise, the clone collapsed.