An ancient tribe attempts to sacrifice Sanna as an offering to the Sun god to save their tribe from dinosaurs. Tara, a young man from another tribe, saves Sanna and takes her along with him.
Unfortunately the movie When Dinosaurs Ruled the Earth is not yet available on HBO Max.
| Directing | Val Guest | Director |
| Production | Aida Young | Producer |
| Sound | Mario Nascimbene | Original Music Composer |
| Camera | Dick Bush | Director of Photography |
| Editing | Peter Curran | Editor |
| Art | John Blezard | Art Direction |
| Crew | Alan Bryce | Special Effects |
| Crew | Roger Dicken | Special Effects |
| Crew | Brian Johnson | Special Effects |
| Visual Effects | Jim Danforth | Visual Effects |
| Writing | Val Guest | Writer |
| Writing | J.G. Ballard | Writer |
