In the prehistoric era, a young man (John Richardson) is banished from his people when he challenges his father (Robert Brown). After traveling for quite awhile, he discovers another tribe of people who are more civilized and enlightened than his own barbaric tribe. He finds himself attracted to a comely beauty (Raquel Welch) of the tribe and she seems to return the attraction. Directed by Don Chaffey and with special visual effects by the legendary Ray Harryhausen. It's a remake of the 1940 film ONE MILLION B.C. (no "years" in the title). Its story line is simplistic but no one watches a movie like this for its plot. The attributes of the spectacular Welch aside, the "stars" of the film are the wonderful creations of Harryhausen. Though the film uses real reptiles that are enlarged for the camera (like JOURNEY TO THE CENTER OF THE EARTH) for some scenes, it's Harryhausen's wizardry that antes up the fantasy quality of the film. Perhaps Harryhausen's most notable creation for the film is his Allosaurus and his fight with Richardson is probably the highlight of the movie. Special mention must be made of the other worldly stark Canary Islands location handsomely shot by Wilkie Cooper and the effectively eerie underscore by Mario Nascimbene. With Martine Beswick and Percy Herbert.