Batman Season 2 - Episode 39 -

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 was a rare instance of villains successfully entering the Batcave , though they failed to learn its secret location.

Batman manages to break free from his chains and uses his strength to pry open the giant clam, saving Robin just in time.

The story picks up from the previous episode's cliffhanger, with the having trapped Batman in chains and Robin inside a giant, lethal clam.

(in one of his earliest TV appearances) plays a delivery boy for the Penguin. Key Trivia

The villains trick Venus , the Joker’s former accomplice who was trying to reform, into believing the Penguin has also gone straight. They use her to try and find the location of the Batcave by hiding in the trunk of the Batmobile .