The Joker breaks the Penguin out of Gotham State Prison to help him complete his "Zodiac" themed crime spree. Their primary goal is to collect a $10 million ransom by threatening to turn Gotham City's water supply into jelly.

In the 1960s television series, Season 2, Episode 39 is titled "The Penguin Declines." It originally aired on January 18, 1967, and serves as the conclusion to a multi-part story arc involving a criminal alliance between the Joker and the Penguin . Episode Synopsis

Anticipating their move, Batman ensures the villains are knocked unconscious or otherwise blinded to the cave's location during the trip. In the final confrontation inside the Batcave, the Dynamic Duo defeats the Joker, the Penguin, and their henchmen, officially ending the Zodiac crimes. Production Details Director: Oscar Rudolph . Writers: Stephen Kandel and Stanford Sherman. Guest Stars: Burgess Meredith as the Penguin. Cesar Romero as the Joker. Terry Moore as Venus.

This episode features the first use of the "Batdrone," used to search Gotham for an unauthorized broadcast.