A practical joker and trouble maker Heathcliff struts through life in search of new ways to torment Spike the neighborhood bulldog, or to woo Sonja his beloved fancy feline girlfriend. At home he is bane of Grandpa's existence ,but adored by Grandma and Iggy Nutmeg his human owners. Joined with Heathcliff is The Catillac Cats gang, a band of junkyard cats with there leader Riff-Raff, a short cat with a tall sexy feline girlfriend named Cleo and, a Cadillac car that can change into almost anything. Riff-Raff's get-rich-quick schemes and search for good eats have the rest of the gang Hector, Mungo, and Wordsworth constantly in and out of trouble and adventures.