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| Gene Evans | Steve Karnes | |
| André Morell | Prof. James Bickford | |
| John Turner | John Duncan | |
| Leigh Madison | Jean Trevethan | |
| Jack MacGowran | Dr. Sampson - the Paleontologist | |
| Maurice Kaufmann | Mini Submarine Officer | |
| Henri Vidon | Tom Trevethan | |
| Leonard Sachs | Scientist | |
| John Adams | P.C. Spotting Monster | |
| Joyce Adams | Laboratory Technician | |
| Chris Adcock | Fleeing Man in Crowd | |
| Neal Arden | TV Newscaster | |
| Jack Armstrong | Police Inspector | |
| Michael Beint | Navy Lieutenant | |
| Paul Beradi | Man Listening to Car Radio |
| Director |
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| Producer | David Diamond
Ted Lloyd |
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| Writer | Eugene Lourie
Robert Abel |
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| Cinematography | Ken Hodges
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| Musician | Edwin Astley
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Marine atomic tests cause changes in the ocean's ecosystem resulting in dangerous blobs of radiation and the resurrection of a dormant dinosaur which threatens London. |
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