
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.
Genres:

Dean Jagger as Dr. Adam Royston

Leo McKern as Inspector McGill

William Lucas as Peter Elliott

Edward Chapman as John Elliott

John Harvey as Maj. Cartwright

Michael Ripper as Sgt. Harry Grimsdyke

Anthony Newley as LCpl. 'Spider' Webb

Ian MacNaughton as Pvt. Haggis

Peter Hammond as Lt. Bannerman

Kenneth Cope as Pvt. Lansing

Michael Brooke as Willie Harding

Frazer Hines as Ian Osborn

Neil Wilson as Russell

Stella Kimball as Willie's Nurse

Jameson Clark as Jack Harding

Jane Aird as Vi Harding

Neil Hallett as Harry, the amorous intern

Marianne Brauns as Zena, the amorous nurse

Max Brimmell as Hospital Superintendant

Brown Derby as The Vicar

Norman MacOwan as Old Tom

Anthony Sagar as Rear Gate Night Watchman

Edwin Richfield as Soldier Burned on Back

John Stone as Gerry

Lawrence James as Gerard

Frank Taylor as Constable Williams

John Stirling as Police Car Driver

Jack Lambert as Police Sergeant

Archie Duncan as Sgt. Yeardye
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