Heathcliff and the Catillac Cats

Terrible Tammy [Heathcliff] (1x59)

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Marcy gets a new cat, Tammy, who challenges Heathcliff's position as top cat in the neighborhood. It's a terrible blow to Heathcliff's ego to have a female cat take over, but neither he nor the alley cats can defeat this lady. Sonja knows how to handle Tammy, however, and puts Heathcliff back in charge.