A cowboy named Tuck Kirby seeks fame and fortune by capturing an Allosaurus living in the Forbidden Valley and putting it in a Mexican circus. His victim, called the Gwangi, turns out to have an aversion to being shown in public.

Director: Jim O'Connolly

Cast: James Franciscus, Gila Golan, Richard Carlson, Laurence Naismith, Freda Jackson, Gustavo Rojo, Dennis Kilbane, Mario De Barros, Curtis Arden, Jose Burgos