The Dynamic Duo, Batman and Robin, are invited to Gotham State Penitentiary to witness a new crime-fighting device - a crime-prevention device. There, along with Gotham City District Attorney, Harvey Dent, Dr. Hugo Strange is demonstrating his Evil Eradicator. The Joker, Penguin, Riddler, Egghead and Mr. Freeze are ushered in as test subjects. Strange's assistant, Dr. Harleen Quinzel operates the machine. However, the dastardly villains have cooked up a counter-plot - to overload the machine with their evil - which leads to disastrous results.
Soon, a new criminal mastermind is unleashed on Gotham! Who works behind the scenes of King Tut's and Bookworm's schemes. His dual, diabolical plots unfold, selling The Dynamic Duo's secret identities to the highest bidder, which includes a game show-style panel of The Joker, Penguin, Riddler, Egghead, Freeze, Shame and Clock King; while unleashing the evil within every Gothamite!
Horrors! How will The Caped Crusader and The Boy Wonder ever save the day?