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