Tony Britton
Dr. Robert Marriott
Acting
Virginia Maskell
Dr. Lucy Byrne
Acting
Ian Bannen
Alan Andrews
Acting
Kenneth Griffith
Dr Shole
Acting
Peter Cushing
Professor Sewell
Acting
Thorley Walters
Special Agent Prince
Acting
Donald Pleasence
Parsons, alias Bill Brown
Acting
Spike Milligan
Arthur, lab orderly
Acting
Raymond Huntley
Sir George Gatting the Minister of Defense
Acting
Sam Kydd
Slater
Acting
Anthony Booth
Parkin
Acting
Basil Dignam
Dr Childs
Acting
Brian Oulton
Director
Acting
Robert Bruce
Levers
Acting
John Payne
Iverson
Acting
Bruce Wightman
Phil the Barman
Acting
Geoffrey Bayldon
Rosson
Acting
Andre Charisse
Heller
Acting
Ian Wilson
Pin Table Man
Acting
Margaret Lacey
Prince's Secretary
Acting
Murray Melvin
Teddy Boy
Acting