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 evading capture, Black Mask comes across the Joker, who tries to kill him, alleging that the Mask stole his most valued position, leading to Robin's demise. Batman captures them both and turns them over to the authorities.