On the run, Black Mask runs into the Joker, who attempts to kill him, claiming that the Mask stole the Joker's favorite job, killing Robin. Batman captures them both and gives them to the police.
While on the lam, Black Mask meets up with the Joker, who attempts to murder him, claiming that the Mask appropriated his most cherished role, resulting in Robin's demise. Batman captures them both and turns them over to the authorities.