Upon his release from Gotham City Prison, The Joker is immediately picked up by The Catwoman in her KittyCar. They soon arrive at a sleazy hotel across the street from Police HQ, where The Catwoman shows The Joker an old parchment that will direct them to a hidden cache of gunpowder they will use to blast a hole in The Federal Depository and clean the place out! Before leaving, they alert The Batman by shooting at him from an open window. The Caped Crusader traces the gunfire to the hotel room and finds The Joker's prison garb and a corner from the parchment. Moments later, Batgirl arrives and makes off with the fragmented parchment; returning to the library as Barbara Gordon, she finds the parchment was purr-loined from the very same library out of which she works. She locates a mircofilm copy and discovers that it contained an ancient riddle, which when mixed with certain clues will lead to the hidden gunpowder!

Barbara solves the riddle and goes to her father's office at Police HQ to call Batman (via The Batphone!!!) and arrange to rendezvous with The Dynamic Duo at the home of Little Louie Groovy, who owns the parchment's first clue: a nightshirt. The Batman and Robin arrive just as The Catwoman and The Joker arrive to steal the nightshirt. Joker tricks The Duo into shaking hands and buzzes them with his deadly Joker buzzer, and he and Catwoman leaves with the shirt. Batgirl appears moments later to revive batman and robin, and informs them that the shirt was only half the clue to the gunpowder's location, and The Dynamic Trio speed for the home of mod clothier Karnaby Katz, who owns the clue' second half in the form of a crib. However, The Trio arrive too late - or so it seems! Just outside the bushes Joker, Catwoman and their men wait in ambush for them!