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
Geoffrey Bayldon
Rosson
Andre Charisse
Heller
Ian Wilson
Pin Table Man
Margaret Lacey
Prince's Secretary
Murray Melvin
Teddy Boy
