| Person | Type | Job | Role(s) |
|---|---|---|---|
 Anthony Mendleson | Crew | Costume & Make-Up | Costume Designer |
Austin Dempster | Crew | Camera | Camera Operator |
Edwin Astley | Crew | Sound | Original Music Composer, Conductor |
Geoffrey Drake | Crew | Art | Art Direction |
George Stephenson | Crew | Sound | Sound |
 Jack Arnold | Crew | Directing | Director |
James H. Ware | Crew | Production | Production Manager |
John Wilcox | Crew | Camera | Director of Photography |
Jon Penington | Crew | Production | Associate Producer |
Leonard Wibberley | Crew | Writing | Novel |
 Maurice Binder | Crew | Art | Title Designer |
Raymond Poulton | Crew | Editing | Editor |
Red Law | Crew | Sound | Sound |
Richard Marden | Crew | Sound | Sound Editor |
Roger MacDougall | Crew | Writing | Screenplay |
 Stanley Mann | Crew | Writing | Screenplay |
Stuart Freeborn | Crew | Costume & Make-Up | Makeup Artist |
Walter Shenson | Crew | Production | Producer |
Joyce James | Crew | Costume & Make-Up | Hairdresser |
John Winbolt | Crew | Crew | Second Unit Cinematographer |
Pamela Davies | Crew | Directing | Continuity |
Leon Becker | Crew | Production | Production Supervisor |
Philip Shipway | Crew | Directing | Assistant Director |
Gerald Endler | Crew | Visual Effects | Mechanical Designer |
 Alan Gifford | Cast | Actor | Air Raid Warden |
 Austin Willis | Cast | Actor | United States Secretary of Defense |
 Bill Nagy | Cast | Actor | U.S. Policeman (uncredited) |
 Colin Gordon | Cast | Actor | BBC Announcer |
 David Kossoff | Cast | Actor | Professor Alfred Kokintz |
 Eve Eden | Cast | Actress | Spectator (uncredited) |
 Fred Wood | Cast | Actor | Bird Seller (uncredited) |
George Margo | Cast | Actor | O'Hara (uncredited) |
 Guy Deghy | Cast | Actor | Soviet Ambassador (uncredited) |
 Harold Kasket | Cast | Actor | Pedro |
 Jean Seberg | Cast | Actress | Helen Kokintz |
 Juba Kennerley | Cast | Actor | Maybury (uncredited) |
 Leo McKern | Cast | Actor | Benter |
 MacDonald Parke | Cast | Actor | General Snippet |
 Mavis Villiers | Cast | Actress | Telephone Operator (uncredited) |
 Monte Landis | Cast | Actor | Cobbley |
 Peter Sellers | Cast | Actor | Grand Duchess Gloriana XII / Prime Minister Count Rupert Mountjoy / Tully Bascombe |
 Robert O'Neil | Cast | Actor | Reporter (uncredited) |
 Stuart Saunders | Cast | Actor | Sergeant (uncredited) |
 Timothy Bateson | Cast | Actor | Roger |
 William Hartnell | Cast | Actor | Will Buckley |
 Lionel Murton | Cast | Actor | American General at the Pentagon (uncredited) |
 Bill Edwards | Cast | Army Captain (uncredited) | |
Pat Ryan | Cast | American General (uncredited) | |
John Tatum | Cast | American Admiral (uncredited) | |
Mabel Etherington | Cast | Actress | Ada - Lady in Waiting (uncredited) |
Muriel Greenslade | Cast | Lady in Waiting (uncredited) | |
Fred Haggerty | Cast | Actor | Fenwickian (uncredited) |
Fred Stroud | Cast | Fenwickian (uncredited) | |
| Person | Type | Job | Role(s) |
