After a Middle Eastern oil-rich nation pulls out of contract negotiations with Great Britain, British Colonel Drexel enlists an American soldier-of-fortune, David Frazer, to help kidnap the 14-year-old heir to the throne, Prince Jamil.
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.
