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.

Directed by: Leslie Norman
Written by: Jimmy Sangster
Runtime: 81 minutes
Tagline: It rises from 2000 miles below the earth to melt everything in its path!
Cast:
Edward Chapman Edward Chapman
John Elliott 
Kenneth Cope Kenneth Cope
Pvt. Lansing 
Dean Jagger Dean Jagger
Dr. Adam Royston 
William Lucas William Lucas
Peter Elliott 
Ian MacNaughton Ian MacNaughton
Pvt. Haggis 
Leo McKern Leo McKern
Inspector McGill 
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Also known as:
  • Lo desconocido
  • X, O Monstro Radioativo
  • XX... Unbekannt