Heathcliff knows he is the best cat around! Never have we seen such self-confidence topped off with a heavy dose of vanity, cunning, ruthlessness, and a mischievous love of gags. He cruises and struts down the street and watch out any person, cat, or dog who gets in his way! Although he may terrorize the neighborhood, let an outsider try to push anyone around and he is a veritable tiger of defense. On the other side of town are The Catillac Cats, which typically revolve around leader Riff-Raff's get-rich-quick schemes or searches for food.
Heathcliff and Sonja go to the circus to see Heathcliff's cousin, Rollo the cat-clown. Rollo is troubled because the wild circus animals have become tame, the trapeze artists are afraid of heights, etc. Our hero discovers a plot by a rival circus, and with the help of the Catillac Cats, he fails the evil plan.
Riff Raff and the Catillac Cats sneak onto the Space Shuttle in order to carry a home-made satellite into space and focus it toward Westfinster. They get it up and make it home by the skin of their teeth, but the satellite will only send back pictures of the junkyard!!
Sonja tells Heathcliff he needs to lose a little weight, so he goes on to crash diet with the help of the Alley Cats. Every time Heathcliff weakens and tries to eat something, Mungo or Hector snatch the food away. When Heathcliff is finally able to tell Sonja he has lost ten pounds, she admits he'll love him at any weight, so our hero instantly returns to his former gluttonous ways.
Leroy gets a new assistant dog in the junkyard and announces that tougher rules will now be enforced. The new dog is the world's worst practical joker and makes our heroes suffer unmercifully until Riff Raff discovers that the new dog can dish it out, but he can't take it.
Heathcliff suffers a nasty bang on the head, which renders the "Devil Cat" side of his personality stunned and permits the "Angel Cat" side to take over. Suddenly Heathcliff is good as gold and begins performing numerous acts of kindness toward Spike. Spike is confused, but certainly willing to take advantage of the situation. He even puts on a show for the other animals to demonstrate his new ability to make Heathcliff do his bidding. However, when the "Devil Cat" recovers, Heathcliff puts Spike back in his place posthaste.
Riff Raff must survive one night in a haunted mansion to win a contest of bravery for Cleo's affections. The Catillac Cats accompany Riff Raff, and are terrorized by all manner of embodied spirits. In the end, however, Riff Raff manages to employ the spooks to frighten away the competition for his love.
