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