The biggest thing since creation!
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.
TMDB audience score
Based on 62 votes
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Availability in the US
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United States listings · Refreshed 13 Oct 2026. More horror to watch in the US
MyCinema quick facts
Worked out from the film's TMDB record and its United States provider listings. These are facts about the data, not a review.
Short watch · 1h 20m
At 1h 20m it runs under 90 minutes.
More horror under 90 minutesScience Fiction · Horror
TMDB files it under science fiction and horror.
3 free · 5 to rent · 5 to buy
Not listed on a subscription service. Free or ad-supported on Plex, Plex Channel, and Cineverse. Listed to rent from 5 stores. Listed to buy from 5 stores.
5.8 / 10 on TMDB
TMDB users rate it 5.8 out of 10 across 62 votes, a mixed audience score. That is a moderate sample of voters.
The scare meter is MyCinema's own rating, given by a person who has watched the film. It is not a TMDB score.
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Horror and thrillers that TMDB recommends alongside this film.
X: The Unknown
1956, 1h 21m
Army radiation experiments awaken a subterranean monster from a fissure that feeds on energy and proceeds to terrorise a remote Scottish village. An American research scientist at a nearby nuclear plant joins with a British investigator to discover why the victims were radioactively burned and why, shortly thereafter, a series of radiation-related incidents are occurring in an ever-growing straight line away from the fissure.
Open X: The Unknown
