It rises from 2000 miles below the earth to melt everything in its path!
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.
Screenplay: Jimmy Sangster
Director: Leslie Norman
Director of Photography: Gerald Gibbs
Story: Jimmy Sangster
Producer: Anthony Hinds
X The Unknown / Original Theatrical Trailer (1956)