Heathcliff and the Catillac Cats

The Big Break In [Catillac Cats] (1x110)

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A lady moves into the neighborhood that has twelve gorgeous female cats. Riff Raff, Hector and Mungo try several plans to break into the house and meet the new felines, but only Riff Raff succeeds. However, once inside, he discovers that a harem is more than he had bargained for, and makes his escape.