Valley of the Dragons (UK title: Prehistoric Valley) is a black and white 1961 American science fiction film loosely based on Jules Verne's Off on a Comet and heavily dependent on stock footage from the movies One Million B.C., King Dinosaur, Cat-Women of the Moon and Rodan.

[2] 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.

The two men are reunited rescuing the Cave People from attacking dinosaurs (this earth's dragons) with an avalanche.

The film was produced by Al Zimbalist who says he was given a copy of the Verne novel that his 16 year old son Don had found in a London bookshop.

[2] Jules Verne adaptations were in vogue at the time ever since the success of Twenty Thousand Leagues Under the Sea and Around the World in 80 Days.

"[5] "Verne is the purest kind of escapist," said Zimbalist, adding that "whatever you say about his imagination and his genius, he just did not have a good storyline.

However he says he was saved by the fact that Zimbalist ensured the amount of company overhead was fixed, and that the filmmakers could use a left over jungle set from Columbia's The Devil at 4 O'Clock (1961) that cost half a million to make; the entire film was shot on that set.

Bernds believed that, in residual cheques for television showings over the years, Valley of the Dragons gave him more income than his script work on the Elvis Presley picture Tickle Me.