Catwoman, released from jail, starts a weight-reducing salon as Selina Kyle. But her real ploy begins when she offers crash-reducing courses to eight women just out of the Women's House of Detention, who soon discover they are to be Catwoman's doubles and partners. The ladies balk at first, until Catwoman defeats them all in combat and, after slenderizing them, issues them all Catwoman costumes. That night as Batman and Robin go on patrol at night they see Catwoman's crooks driving the Catmobile stealing the pearl, Batman and Robin defeat the crooks.

Batman and Robin deduce that the Catwoman's target for theft will be the Petala Pearl, the Orient's biggest such gem, worn by the visiting Nizam of Nepal, because the capital of Nepal is Katmandu, cuing the cat-crime. Batman offers the Nizam the use of his mansion to stay in for a few days, and a police cordon is placed around the grounds.

Catwoman and her Feline Furies steal in, decoying and waylaying the police. Catwoman herself snatches what seems to be the pearl from what seems to be a sleeping Nizam, but the pearl is phony, and Batman and Robin trick her into getting tangled up in a ball of sticky plastic "yarn", trapping her. The "Nizam" proves to be Alfred in disguise while the real Nizam is hiding safely elsewhere.

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