Using every ounce of his superhuman Batstrength, Batman bursts free of his chains, rushes over to the clam and pries it open long enough to rescue Robin from the maw of the menacing mollusk! Freing Venus, the trio make their escape, while The Joker, needing more assistance with his remaining 2 Zodiac Crimes, has his flunkies Uranus and Mars smuggle The Penguin out of prison in a prison laundry truck (by way of Operation Laundry Bag!). Using a mixture of his own insidious creation, The Joker turns the entire Gotham City water supply (Aquarius The Water-Bearer!) into Jokerjelly (concentrated strawberry gelatin which resembles strawberry jelly, but tastes like strawberry axle grease!), and then demands $10 million to change it back! Meanwhile, The Penguin, claiming he has reformed, tries to woo Venus (who's staying at Bruce Wayne's midtown apartment) into asking Batman to let her visit The Batcave, so she can remove Penguin's criminal record from The Batcomputer for him. The Dynamic Duo fly out to the Jokerjelly-infested Gotham City Reservoir by Batcopter and restore the water supply with the trusty aid of a Special Exploding Batarang and The Portable Batlab. Returning to the city, Batman and Robin pay a visit to Venus, who, falling for Penguin's fib about going straight, she convinces Batman into taking her to The Batcave.

Hoping to make Batman the goat (Capricorn!!!), Penguin, Joker, and henchmen Mercury, Mars, Saturn, Neptune and Uranus secretly stow away in The Batmobile's trunk. The Duo returns to The Batcave with Venus (having doused her with Batgas, naturally!), and there the crooks pop right out, ready for doing away with Batman and Robin, and converting The Batcave into the headquarters of Gotham City's criminals! But The Caped Crusader stops them by activating his newly designed Batspectrograph Criminal Analyzer, which recorded Joker and Penguin's bone structure, metabolism rate, molecular blood structure, retina patterns, and other invaluable scientific data (he knew of their hiding in the trunk all along, and so he brought them both to The Batcave in order to utilize The Analyzer which only works at close range and is too large to move). The Penguin tries to liquidate The Duo with his deadly Umbrella Gun, but The Batprobe Negative Ion Attractor, which Batman strategically installed in The Batmobile's trunk, depleted its power source during the time they were inside. After a fierce fight, the whole gang is captured and ready to be delivered to prison. Later at Wayne Manor, Dick Grayson cringes as he learns from Aunt Harriet that the main course for dinner is clam chowder, but his guardian Bruce assures him it's his chance to get even!

TOMORROW: the Cat-astrophic return of Julie Newmar as The Catwoman!