Penguin and Catwoman join forces to steal a pair of valuable gems. But when The Batman arrives to stop them, Catwoman is double-crossed by Penguin, who handcuffs her to the Dark Knight.
Fearing that Riddler will make good on his threat to destroy the city, The Batman and Detective Yin's secret alliance is put at risk when they must work together to solve a string of riddles that have been scattered throughout Gotham.
Firefly and Mr. Freeze make an unlikely pair as they join forces to plunge Gotham into a permanent winter. With the entire police force "iced over," The Batman is the city's only hope for survival.
Joker, dressed as Batman, begins a new reign of terror in Gotham. When the real Batman tries to stop him, Joker injects him with a poison that will cause him to laugh to death, unless he can come up with an antidote.
Penguin discovers a sonic device that allows him to turn Man-Bat into his personal slave. Meanwhile, Alfred must deal with a raccoon that has found its way into the Bat-Cave and is wreaking havoc on the electrical equipment.
Despite intensive rehabilitation, Ethan Bennett once again takes the form of Clayface in order to seek revenge against Joker, the man who turned him into that monster.
Joker pirates the airwaves of Gotham in order to broadcast his crimes on TV as entertainment. When Detective Yin's overzealous new partner tries to bring down the clown prince of crime, he merely becomes Joker's latest "costar."
Spellbinder, a three-eyed mystic with the ability to induce both hypnosis and visions, sets his sights on stealing the valuable Eye of Sarkana--mesmerizing Alfred to be his personal thief.
Joker takes Detective Yin hostage; he is captured he refuses to reveal her location. Batman must use a device created by Professor Hugo Strange to enter the Joker's mind in search of an answer.
Joker, Penguin and Riddler battle over control of the City. They finally decide to settle their differences by giving all of Gotham over to whoever is able to capture and discover the true identity of the Batman.