Grand Duchess Gloriana XIII
Margaret Rutherford
Prime Minister Rupert Mountjoy
Ron Moody
Wendover
Tom Aldredge
British Aide
Michael Trubshawe
Russian Delegate
Peter Sallis
Bandleader
Clive Dunn
Plumber
Hugh Lloyd
Standard Bearer
Graham Stark
Mario - the Valet
Mario Fabrizi
Russian Aide
Jan Conrad
Von Neidell
John Bluthal
U.S.A.F. General
Archie Duncan
Vincent Mountjoy
Bernard Cribbins
Russian Scientist
Guy Deghy
Russian Air Force General
Richard Marner
Member of Whitehall Conference
Allan Cuthbertson
Robin Bailey
Gerald Andersen
Civil Sergeant
Gordon Phillott
Countryman
John Wood
Wine Waiter
George Chisholm
Pilot
Vincent Ball
News Announcer
Frank Duncan
Professor Kokintz
David Kossoff
American Astronaut
Ed Bishop
Bill Edwards
Russian Astronaut
Laurence Herder
Harvey Hall
Self
Frankie Howerd
1st Councillor (uncredited)
Stringer Davis
Lady-in-Waiting (uncredited)
Lucy Griffiths
Cynthia
June Ritchie
Maurice Spender
Terry-Thomas
British Delegate
John Le Mesurier
Bracewell - U.S. Delegate
John Phillips
M.I.5 Man
Eric Barker
Benter
Roddy McMillan
Director
Richard Lester
Music
Ron Grainer
Assistant Art Director
William Alexander
Camera Operator
Kelvin Pike
Costume Designer
Anthony Mendleson
Sound Recordist
Bill Daniels
Sound Editor
Roy Hyde
Animation
Trevor Bond
Continuity
Eileen Head
Makeup Artist
George Blackler
Hairdresser
Stella Rivers
Dudley Messenger
Title Designer
Maurice Binder
Wardrobe Master
Laurel Staffell
Assistant Director
Ross MacKenzie
Director of Photography
Wilkie Cooper
Production Manager
R. E. Dearing
Novel
Leonard Wibberley
Screenplay
Michael Pertwee
Production Design
John Howell
Editor
Bill Lenny
Producer
Walter Shenson