It rises from 2000 miles below the earth to melt everything in its path!
Dean Jagger
Dr. Adam Royston
Leo McKern
Inspector McGill
William Lucas
Peter Elliott
Edward Chapman
John Elliott
John Harvey
Maj. Cartwright
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.
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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
The Scene That Made Audiences Afraid of the Ground Beneath Them
Clip · YouTube
This Film Was Melting Faces Before Indiana Jones
Clip · YouTube
The Moment Something Terrifying Awoke Beneath The Surface
Clip · YouTube
4K Restoration | Official Trailer
Trailer · YouTube
Joe Dante on X - THE UNKNOWN
Featurette · YouTube
Original Theatrical Trailer
Trailer · YouTube
