Unhinged bumpkin Greely (Billy Thurman) has two companions: Bella (Annabelle MacAdams), a young woman he's kidnapped, and a huge monster that lives in a cave near his rural home. The monster typically eats animal flesh, but when strangers -- a vacationing couple, Norman (Corveth Ousterhouse) and Leilla (Shirley Bonne), and paleontologist Wayne (Tommy Kirk) -- wander onto his land, Greely fixes to give his bucktoothed buddy a human treat. Unless they escape, the four abductees will be supper.