Storyline
When a government official disappears in the London tunnels, after several reports of missing people in the same location, Scotland Yard start to take the matter seriously, along with a couple who stumble into a victim by accident.
Director
Writers
Top Cast
Donald Pleasence
Inspector Calhoun
Norman Rossington
Det.Sgt. Rogers
David Ladd
Alex Campbell
Sharon Gurney
Patricia Wilson
Hugh Armstrong
The "Man"
June Turner
The "Woman"
Clive Swift
Inspector Richardson
James Cossins
James Manfred O.BE.
Heather Stoney
P.C.W. Alice Marshall
Hugh Dickson
Dr. Bacon
Christopher Lee
Stratton-Villiers, MI5
Jack Woolgar
Platform Inspector
