Born Killer is the son of the Joker and Harley Quinn. Trained to be an assassan by military training in order to fuffil his father's death wish to kill The Batman and his sidekick Robin. He is dissapointed when he returns to Gotham, only to find that the Batman is already dead. He then becomes the arch-enemy of both of Batman Successors. The New Batman, Terry McGuiness and Dick Grayson, a.k.a Nightwing.