One Million Years B.C. is a 1966 (released in the United States in 1967) adventure film and fantasy film starring Raquel Welch set - loosely - in the time of cavemen. The film was made by Great Britain's Hammer Film Productions, and was a remake of the 1940 Hollywood film One Million B.C.. It is marketed with the tagline "Travel back through time and space to the edge of man's beginnings...discover a savage world whose only law was lust!"

The film is largely ahistorical. It portrays dinosaurs and man living together, whereas dinosaurs died out some 64 million years prior to the date at which the film is set. Also, a million years ago the closest thing to a modern human being was Homo erectus. However, since it is a fantasy, Ray Harryhausen and Hammer felt free to put man and dinosaurs from different times together and invent a few fancy clothes. Harryhausen has stated in a commentary of the unfinished film, Creation shown on the King Kong 1933 DVD, that he did not make One Million Years B.C. for "professors" who in his opinion "probably don't go to the cinema anyway."

Caveman Tumak is banished from his savage tribe. He finds a brief home among a group of gentle seacoast dwelling cave people until he is banished from them as well. Missing him, one of their women, Loana leaves with him, deciding to face the harsh prehistoric world with its monsters and volcanos as a couple. Written by Jim Cobb

Tumak, a member of the Rock Tribe, is expelled from their cave after running afoul of their leader Akhoba, who also happens to be his father. After several days of wandering, he meets stumbles upon several female members of the Shell Tribe, a group that lives on the coast. Loana, the daughter of the chief, sees that he is in terrible shape from his ordeal and nurses him back to health. This causes her betrothed to become jealous and eventually the two of them get into a major fight and Tumak is expelled as a result. However, Loana decides to join him and follows him back to the caves of his people. While there Loana teaches the Rock people civility and this causes Tumak to become the new leader (Akhoba was severely injured while Tumak was away). This doesn't sit well with Tumak's brother Sakana who begins to plot to have Tumak overthrown. Written by Brian Washington