X: The Unknown (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.

Directed by: Leslie Norman

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

Links: IMDb, Movie posters, Movie stills