The plot involves the Dynamic Duo trying to take down their main four nemeses -- Joker, Riddler, Penguin and Catwoman -- who've joined forces to capture a Replicator Ray. which is a laser-gun of sorts that can make an exact replica of anything it targets. Despite falling into the right hands, those with wrong hands still manage to manipulate matters to their benefit, resulting in a major upheaval in the city of Gotham that could have long-ranging consequences if the good guys can't figure out how to reverse the Ray's duplicative properties.