Trailer
 | Ralph Richardson as Prof. Heatherville |
 | Raymond Huntley as Prof. Laxton-Jones |
 | John Laurie as Dr. McVitie |
 | Ernest Jay as Dr. Dainty |
 | David Tomlinson as Mr. Watlington |
 | Finlay Currie as Sir Duncan Wills |
| Norman Webb as Dr. Wainwright |
 | Michael Hordern as Lt. Cmdr. Lowther |
 | Pamela Matthews as Mrs. Watlington |
| Joan Haythorne as Mrs. Laxton-Jones |
 | Joan Young as Mrs. McVitie |
| Ann Wilton as Mrs. Dainty |
 | Richard Attenborough as Jack Arnold |
 | David Hutcheson as Squadron Leader Sowerby |
 | Patrick Waddington as Group Capt. Aspinall |
 | Cyril Smith as Flight Sgt. Cox |
 | James Hayter as Warrant Officer |
| D. Bradley Smith as Air Marshal Cotter |
 | Robin Bailey as Wives' Escort Officer |
| Hugh Dempster as Sqdn. Ldr. Slatter |
| Kenneth Buckley as Sqdn. Ldr. Buckley |
 | Paul Carpenter as Flt. Lt. Argylle |
 | Anthony Dawson as Flt. Lt. Norton |
| Robert Long as Flying Officer Davies |
| Richard Mantell as Air Vice-Marshal |
 | Murray Matheson as Wing Cdr. Allen |
| Anthony Wyckham as Flying Officer Ogden |
 | Peggy Evans as Daphne Adams |
| Ingrid Forrest as Penelope Birkenshaw |
| Geraldine Keyes as Phyllis Hammond |
 | Vida Hope as WAAF Flight Sergeant |
| Sonia Elverson as WAAF Teller |
 | Robert Wyndham as Major |
| Andrew Blackett as Captain |
 | Bill Owen as Paratroop Sergeant (as Bill Rowbotham) |
| Tony Arpino as 1st Commando |
| Peter March as 2nd Commando |
| Bob Elson as 3rd Commando |
| Roger Keyes as 4th Commando |
| Trevening Hill as 5th Commando |
| Edward Hodge as 6th Commando |
| Joseph Almas as Dr. Klemmerhahn |
| Arthur Rieck as Lt. Hense |
| Ernest Urbank as 1st Sentry |
| Karl Morel as 2nd Sentry |
 | Marjorie Rhodes as Mrs. Arnold |
| Edward Lexy as Sir Desmond Prosser |
 | Hugh Pryse as Sir Nicholas Hathaway |
 | O.B. Clarence as Old Retainer |
 | Aubrey Mallalieu as 1st Club Member |
 | Desmond Roberts as 2nd Club Member |
| Guy Belmore as 3rd Club Member |
| Alvar Liddell as BBC Announcer (voice) |
 | Kenneth More as Bomb Aimer (uncredited) |
 | Arthur Mullard as (uncredited) |
| Ian Selby as Man at Dance (uncredited) |
| Directing | |
| Peter Ustinov | Director |
Writing | |
| Peter Ustinov | Writer |
Production | |
| George H. Brown | Producer |
Editing | |
| Russell Lloyd | Editor |
Sound | |
| Alan Rawsthorne | Original Music Composer |
Production | |
| Filippo Del Giudice | Executive Producer |
| Peter Ustinov | Producer |
Art | |
| Paul Sheriff | Supervising Art Director |
Costume & Make-Up | |
| Tony Sforzini | Makeup Artist |
| Vivienne Walker | Hairstylist |
Directing | |
| Michael Anderson | Assistant Director |
Camera | |
| Jack Hildyard | Director of Photography |
Sound | |
| Desmond Dew | Sound Recordist |
| Harry Miller | Sound Editor |
Production | |
| David Cousland | Production Manager |
Art | |
| Carmen Dillon | Art Direction |
Sound | |
| John Cook | Sound Recordist |
Lighting | |
| Norman Foley | Gaffer |
Sound | |
| Muir Mathieson | Music Director |
Camera | |
| Gilbert Taylor | Camera Operator |
