An ancestor of John Thomas Stuart XI brought the alien, long-lived Lummox home from an interstellar voyage. The articulate, sentient pet he inherited has gradually grown from the size of a collie pup to a ridable behemoth--especially after consuming a used car. The child-like Lummox is perceived to be a neighborhood nuisance and, upon leaving the Stuart property one day, causes substantial property damage across the city of Westville.