Valley of the Dragons (released in UK as Prehistoric Valley) is a black and white 1961 American science fiction film loosely based on Jules Verne's 1877 novel Off on a Comet (aka Hector Servadac) and heavily dependent on stock footage from the movies One Million B.C., King Dinosaur, Cat-Women of the Moon and Rodan. Director Edward Bernds says the film was originally built around stock footage from One Million B.C.

Plot

Two men preparing for a duel in 1881 Algiers, Irishman Michael Denning and Frenchman Hector Servadac, are swept from the face of the Earth by a passing comet and find themselves on another world with cavemen and prehistoric animals. They try to find a way back to Earth.