Heathcliff and the Catillac Cats

The Baby Buggy Badguys [Heathcliff] (1x119)

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Marcy dresses Heathcliff in baby clothes and is pushing him down the street, when two crooks disguised as mother and child rob a jewellery store. The police confuse the duos and throw Heathcliff in jail! Undaunted, our courageous cat escapes his cell, apprehends the true offenders, and surfaces a hero.