Teenager Terry McGinnis -- the new Batman -- thought he knew everything he needed to know about fighting crime in Gotham City. After all, the original Batman, Bruce Wayne, is his mentor. But when a gang of thugs known as the Jokerz suddenly starts following a mysterious new leader, Terry goes on full alert. Good plan. Because the "new" leader is really an old -- and feared -- enemy, the original Joker. And the diabolical prankster has it in for both Batmans. Now it's up to Terry to take the Joker down -- for good. But he may have to dig up some dark secrets from the Joker's past ...and from Bruce Wayne's.