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 is trying to sleep in a vacant lot when he is disturbed by a noisy construction crew. To revenge his loss of sleep, Heathcliff single-handedly destroys the new structure and hides all of the workers' tools.
Cleo wants to take a trip, so Riff Raff packages her and the other cats up and sends them through the mail to what he believes to be a ski report. However, the gang end up in a wild animal park where they have endless adventures with the jungle beasts.
Iggy goes into a hospital to have his tonsils removed, and Heathcliff goes along - even though no pets were allowed. Heathcliff terrorizes the hospital in a very short time, and even gives a lecture posing as a visiting doctor.
Hector complains about Riff Raff's leadership of the Catillac Cats, so Riff Raff offers to let him take over. After a series of dumb decisions and blatant bungles, even Hector has to agree there is no leader for the gang except Riff Raff.
Iggy and Marcy take Heathcliff along shopping for an anniversary gift for Grandma and Grandpa Nutmeg. Heathcliff seizes every opportunity to cause mayhem in the department store, and even tries to swipe a rhinestone collar for Sonja to replace the one she's recently lost. On the way home, Heathcliff finds Sonja's lost collar in the grass, which makes him a hero.
Riff Raff's brother comes to visit and gets into trouble with the junkyard dog Leroy.
