Calificación
Reparto

Tony Britton
Dr. Robert Marriott

Virginia Maskell
Dr. Lucy Byrne

Ian Bannen
Alan Andrews

Kenneth Griffith
Dr Shole

Peter Cushing
Professor Sewell

Thorley Walters
Special Agent Prince

Donald Pleasence
Parsons, alias Bill Brown

Spike Milligan
Arthur, lab orderly

Raymond Huntley
Sir George Gatting the Minister of Defense

Sam Kydd
Slater

Anthony Booth
Parkin

Basil Dignam
Dr Childs

Brian Oulton
Director

Robert Bruce
Levers

John Payne
Iverson

Bruce Wightman
Phil the Barman