A practical joker and career 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 the bane of Grandpa's existence but adored by Grandma and Iggy Nutmeg, his human owners. Joined with Heathcliff is The Catillac Cats, a band of junkyard cats with their 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, Mugo, and Wordsworth) constantly in and out of trouble and adventures.