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| Bill Travers | Joe Ryan |
| William Sylvester | Sam Slade |
| Vincent Winter | Sean |
| Christopher Rhodes | McCartin |
| Joseph O'Conor | Prof. Hendricks |
| Bruce Seton | Prof. Flaherty |
| Martin Benson | Dorkin |
| Maurice Kauffman | Radio Reporter |
| Basil Dignam | Admiral Brooks |
| Barry Keegan | Mate |
| Thomas Duggan | First Naval Officer |
| Howard Lang | First Colonel |
| Dervis Ward | Bosun |
| Connie Tilton | |
| David Wilding | |
| Mick Dillon | Gorgo (uncredited) |
| Peter Brace | |
| Peter Perkins |
When an undersea volcano sends tremors throughout the Atlantic, aquatic creatures come out of hiding. Merchant seamen Joe Ryan and partner Sam Slade harness the most unusual of the lot, a massive beast that looks like a Tyrannosaurus Rex. The enterprising sailors deliver their quarry to a British circus, but it turns out that the animal is a newborn. And, when his much larger mother arrives in London to rescue her son, the city feels her wrath.
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