A turn of the century wild west show struggling to make a living in Mexico comes into the possession of a tiny prehistoric horse. This leads to an expedition to the Forbidden Valley where they discover living dinosaurs. They capture one and take it back to be put on display, leading to inevitable mayhem.

• Warner Bros.-Seven Arts
• James Franciscus
• Gila Golan
• Richard Carlson
• Laurence Naismith
• Freda Jackson
• Gustavo Rojo
• Dennis Kilbane
• Mario De Barros