4K Restoration | Official Trailer
Trailer
Jimmy Sangster (Screenplay) · Leslie Norman (Director)
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
4K Restoration | Official Trailer
Trailer
Original Theatrical Trailer
Trailer
The Scene That Made Audiences Afraid of the Ground Beneath Them
Clip
This Film Was Melting Faces Before Indiana Jones
Clip
The Moment Something Terrifying Awoke Beneath The Surface
Clip
Joe Dante on X - THE UNKNOWN
Featurette
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.
