Upset that Batman and his new sidekick, Batgirl, are ruining his plans, Joker decides that he needs a partner of his own. He soon finds the right person in Donnie, a misguided prankster who attends classes at the same high school as Barbara. When she realises that Donnie is Joker’s new sidekick called Prank, she and Batman find themselves trying to convince him that Joker is not a good role model to have.
