- HD 1080
- Runtime: 81m.
- Status: Released
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- Languages: en
- Country: United Kingdom
- Director: Leslie Norman
- Stars: Dean Jagger, Leo McKern, William Lucas, Edward Chapman, John Harvey
- keywords: monster, scotland, radiation, radioactivity
- Production_studio: Hammer Film Productions
- Slogan: It rises from 2000 miles below the earth to melt everything in its path!
- The X the Unknown is featured in the top rankings of 1956
- #6 in Top Mystery Movies of 1956
- #7 in Top Horror Movies of 1956
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.
