Egghead steals the Gotham City charter. He finds a loophole that could give him control of Gotham City if descendants of the original founding families (including Bruce Wayne) do not pay nine raccoon pelts to Chief Screaming Chicken on time. Not only is he interested in stopping the payment, but Egghead believes he also has a lead on Batman's true identity.

When the lease payment for Gotham City fails to be made on time, possession of the city falls into the hands of Egghead. Chaos ensues as the villain fires Commissioner Gordon and bans the Dynamic Duo from city limits. While the criminal underworld enjoys free reign, Batman and Robin search the city charter's fine print for a solution.

Louie the Lilac has cornered the flower market in Gotham City, hoping to gain control over the entire "flower generation." He kidnaps the organizer of their planned flower-in, Princess Primrose, and brainwashes her with his Stupefying Aromatic Spray. Batman and Robin follow a clue to the villain's lair only to be captured by Louie and fed to his giant man-eating lilacs. With the Caped Crusaders out of the way, Louie heads back to the flower-in to continue his evil plan. Alfred, meanwhile, has been alerted to Batman and Robin's situation, and goes looking for Batgirl to aid in the fight.

Egghead and Olga, Queen of the Bessarovian Cossacks, team up to kidnap Commissioner Gordon. In exchange for his safety, they demand a ten cent tax for every egg eaten in Gotham City. Batman and Robin suspect that Olga may also be after the giant Samovar of Genghis Khan and use it to find a way into her hideout. However, it turns out that the Duo have been expected. While Olga targets Batman as her future husband, her cook prepares a wedding borscht which will contain Commissioner Gordon and Robin.

Egghead and Olga, Queen of the Cossacks, steal two pounds of Radium from the Gotham City Radium Center. Using it in their "Zapping Machine," they attempt to hatch an ancient Neosaurus egg, planning to feed the baby dinosaur a meal of Batman, Robin, and Batgirl. Surprisingly, the machine seems to be working. But when the egg cracks, the baby Neosaurus is more than they can handle.

The Catwoman targets the fashion industry by first terrorizing a banquet honoring Batgirl and then attacking a fashion show. During the attack on the fashion show, Catwoman captures Batgirl and takes her back to her hideout where she threatens to kill her with a pattern cutter. She then tells Batman that if he attempts to rescue her that it will leave the visiting Queen Bess of Bellgravia vulnerable for attack. Now the Caped Crusader must find a way to save Batgirl and prevent any harm to Queen Bess.

Egghead and Olga, Queen of the Cossacks, kick off their return with several thefts from the Gotham City Museum. Egghead begins planning a series of heists - intended to provide him with the dowry needed to marry Olga. Swiping 500 pounds of dehydrated caviar goes off without a hitch. But when Batgirl attempts to outfox Egghead, she is instead captured by the villain. It's up to Batman and Robin to find the villains' hideout before Olga's Cossacks make mincemeat out of their crime fighting friend.