There's something pretty grisly going on under London in the Tube tunnels between Holborn and Russell Square. When a top civil servant becomes the latest to disappear down there Scotland Yard start to take the matter seriously. Helping them are a young couple who get nearer to the horrors underground than they would wish.
Donald Pleasence
as Inspector Calhoun
Norman Rossington
as Det.Sgt. Rogers
David Ladd
as Alex Campbell
Sharon Gurney
as Patricia Wilson
Hugh Armstrong
as The "Man"
June Turner
as The "Woman"
Clive Swift
as Inspector Richardson
James Cossins
as James Manfred O.BE.
Heather Stoney
as P.C.W. Alice Marshall
Hugh Dickson
as Dr. Bacon
Christopher Lee
as Stratton-Villiers, MI5
Jack Woolgar
as Platform Inspector
