After a wealthy banker is given an opportunity to participate in a mysterious game, his life is turned upside down when he becomes unable to distinguish between the game and reality.

In the late 1960s/early 1970s, a San Francisco cartoonist becomes an amateur detective obsessed with tracking down the Zodiac Killer, an unidentified individual who terrorizes Northern California with a killing spree.

Having defeated the Joker, Batman now faces the Penguin - a warped and deformed individual who is intent on being accepted into Gotham society. Crooked businessman Max Schreck is coerced into helping him become Mayor of Gotham and they both attempt to expose Batman in a different light. Earlier however, Selina Kyle, Max's secretary, is thrown from the top of a building and is transformed into Catwoman - a mysterious figure who has the same personality disorder as Batman. Batman must attempt to clear his name, all the time deciding just what must be done with the Catwoman.