"Tumak" (John Richardson) finds himself banished from his tribe and forced to survive alone after an initial disagreement. He’s lucky enough to run into "Loana" (Raquel Welch), who lives with her own group near the ocean, though not everyone is welcoming of him – particularly "Payto" (William Lyon Brown), who wants what Tumak has. The story itself, along with the performances and lines spoken, are pretty much worthless from beginning to end. What prevents it from being completely discarded is the visual effects work by Ray Harryhausen. This stop motion animation is exceptional - the dinosaurs and pterodactyls, even though they’re constructed from materials like Styrofoam and paper-mâché, do a better job than all of the human actors combined. Raquel Welch seems entirely misplaced, and Robert Brown, who usually appears more dignified, looks rather silly in his elaborate animal skins as "Akhoba." The conclusion arrives at what feels like the perfect time, but it disappointingly doesn’t give much focus to the dinosaurs themselves.

Source on TMDB