
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
Dr. Adam Royston

Leo McKern
Inspector McGill

William Lucas
Peter Elliott

Edward Chapman
John Elliott

John Harvey
Maj. Cartwright

Michael Ripper
Sgt. Harry Grimsdyke

Anthony Newley
LCpl. 'Spider' Webb

Ian MacNaughton
Pvt. Haggis

Peter Hammond
Lt. Bannerman

Kenneth Cope
Pvt. Lansing
Michael Brooke
Willie Harding

Frazer Hines
Ian Osborn

Neil Wilson
Russell
Stella Kimball
Willie's Nurse

Jameson Clark
Jack Harding
Jane Aird
Vi Harding

Neil Hallett
Harry, the amorous intern
Marianne Brauns
Zena, the amorous nurse
Max Brimmell
Hospital Superintendant
Brown Derby
The Vicar

Norman MacOwan
Old Tom
Anthony Sagar
Rear Gate Night Watchman

Edwin Richfield
Soldier Burned on Back

John Stone
Gerry
Lawrence James
Gerard

Frank Taylor
Constable Williams
John Stirling
Police Car Driver

Jack Lambert
Police Sergeant

Archie Duncan
Sgt. Yeardye
Crew
Leslie Norman
Director

Jimmy Sangster
Screenplay, Story, Production Manager
James Needs
Editor
Gerald Gibbs
Director of Photography
Christopher Sutton
Assistant Director

Michael Carreras
Executive Producer
Anthony Hinds
Producer
Len Harris
Camera Operator
Molly Arbuthnot
Wardrobe Supervisor
Philip Leakey
Makeup Artist, Makeup Effects
Alfred Cox
Sound Editor
Jock May
Sound Mixer
Jack Curtis
Special Effects
James Bernard
Original Music Composer
John Hollingsworth
Music Director
Mike Rutter
Clapper Loader
June Randall
Continuity
Edward Marshall
Art Direction
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