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.

Cast:Dean Jagger, Leo McKern, William Lucas, Edward Chapman, John Harvey, Michael Ripper,

Genre:Horror, Science Fiction, Mystery,

country:United Kingdom,

Production:Hammer Film Productions,