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Directed by | |||
| Norman Taurog | |||
Writing credits(in alphabetical order) | ||
| Robert Considine | story | |
| Frank Wead | ||
| Brian Donlevy | ... | Maj. Gen. Leslie R. Groves | |
| Robert Walker | ... | Col. Jeff Nixon | |
| Tom Drake | ... | Matt Cochran | |
| Beverly Tyler | ... | Anne Cochran | |
| Audrey Totter | ... | Jean O'Leary | |
| Hume Cronyn | ... | Dr. J. Robert Oppenheimer | |
| Hurd Hatfield | ... | Dr. John Wyatt | |
| Joseph Calleia | ... | Dr. Enrico Fermi | |
| Godfrey Tearle | ... | President Franklin D. Roosevelt | |
| Victor Francen | ... | Dr. Marre | |
| Richard Haydn | ... | Dr. Chisholm | |
| Jonathan Hale | ... | Dr. Vannevar Bush | |
| John Litel | ... | K.T. Keller | |
| Henry O'Neill | ... | Gen. Thomas F. Farrell | |
| Warner Anderson | ... | Capt. William S. Parsons | |
| Barry Nelson | ... | Col. Paul Tibbetts Jr. | |
| Art Baker | ... | President Harry S. Truman | |
| Ludwig Stössel | ... | Dr. Albert Einstein (as Ludwig Stossel) | |
| John Hamilton | ... | Dr. Harold C. Urey | |
| Frank Ferguson | ... | Dr. James B. Conant | |
| Tom Stevenson | ... | Dr. E.P. Wigner | |
| John Gallaudet | ... | Dr. Leo Szilard | |
| Nella Walker | ... | Grace Tully | |
| Edward Earle | ... | Charles G. Ross | |
| Moroni Olsen | ... | Dr. Arthur H. Compton | |
| Norman Lloyd | ... | Dr. Troyanski | |
| Jim Davis | ... | Pilot at Tinian | |
| Charles Trowbridge | ... | Walter S. Carpenter Jr. | |
| Frank Wilcox | ... | Dr. W.H. Zinn | |
| Henry Hall | ... | Gen. Brehon Somervell | |
| Paul Harvey | ... | Lt. Gen. W.D. Styer | |
| Larry Johns | ... | Quaker Scientist | |
| Robert Emmett Keane | ... | Dr. Rand | |
| James Bush | ... | Dr. Ernest O. Lawrence | |
| Trevor Bardette | ... | Clinic Doctor | |
| William Wright | ... | Col. John Lansdale | |
| Damian O'Flynn | ... | C.D. Howe | |
| rest of cast listed alphabetically: | |||
| John B. Kennedy | ... | Newsreel Narrator (voice) | |
| Richard Abbott | ... | Danish Underground Leader (uncredited) | |
| Philip Ahlm | ... | Armed Guard (uncredited) | |
| John Albright | ... | Quaker Scientist (uncredited) | |
| Erville Alderson | ... | Secretary of War Henry Stimson (uncredited) | |
| Kirk Alyn | ... | Scientist (uncredited) | |
| Rod Bacon | ... | Crew Member (uncredited) | |
| Frank Baker | ... | Canadian Officer (uncredited) | |
| Walter Baldwin | ... | Workman (uncredited) | |
| John Banner | ... | German Laboratory Assistant (uncredited) | |
| Gregg Barton | ... | Enola Gay Navigator (uncredited) | |
| Holger Bendixen | ... | German Submarine Commander (uncredited) | |
| Lee Bennett | ... | Sergeant (uncredited) | |
| Joseph E. Bernard | ... | Townsman (uncredited) | |
| Margaret Bert | ... | Townswoman (uncredited) | |
| Robert Bice | ... | Co-Pilot (uncredited) | |
| William Bishop | ... | 2nd Lieutenant--Electronics Officer, Enola Gay (uncredited) | |
| Carlyle Blackwell Jr. | ... | Armed Guard (uncredited) | |
| Larry J. Blake | ... | Tough MP (uncredited) | |
| Stanley Blystone | ... | Civilian Guard (uncredited) | |
| John Bogden | ... | Scientist (uncredited) | |
| Charles Bradstreet | ... | Airport Guard (uncredited) | |
| Tex Brodus | ... | Enola Gay Ground Crewman (uncredited) | |
| Paul Bryar | ... | Army Officer (uncredited) | |
| Tom Burton | ... | Officer (uncredited) | |
| Roy Butler | ... | Townsman (uncredited) | |
| George M. Carleton | ... | Senator (uncredited) | |
| James Carlisle | ... | Industrialist (uncredited) | |
| Douglas Carter | ... | Quaker Scientist (uncredited) | |
| Ed Cassidy | ... | Rafferty (uncredited) | |
| Frank Chalfant | ... | Scientist (uncredited) | |
| Spencer Chan | ... | Japanese Naval Officer (uncredited) | |
| Peter Chong | ... | Japanese General (uncredited) | |
| Bron Clifford | ... | Chaplain (uncredited) | |
| Bruce Cowling | ... | Enola Gay Ground Crewman (uncredited) | |
| Ralph Crane | ... | Weatherman (uncredited) | |
| Frank Dae | ... | Senator (uncredited) | |
| Bert Davidson | ... | Armed Guard (uncredited) | |
| Boyd Davis | ... | Senator (uncredited) | |
| Harry Denny | ... | Passing Officer (uncredited) | |
| Tom Dillon | ... | Gregor (uncredited) | |
| Ralph Dunn | ... | Guard (uncredited) | |
| Dick Earle | ... | Industrialist (uncredited) | |
| Helen Eby-Rock | ... | Townswoman (uncredited) | |
| Blake Edwards | ... | CIC Man (uncredited) | |
| Frank Erickson | ... | Attendant (uncredited) | |
| Lloyd Everett | ... | Enola Gay Ground Crewman (uncredited) | |
| Budd Fine | ... | Evictee (uncredited) | |
| William Forrest | ... | Brigadier General (uncredited) | |
| Ted French | ... | Townsman (uncredited) | |
| Arno Frey | ... | Nazi Official (uncredited) | |
| Paul Fung | ... | Japanese Radar Officer (uncredited) | |
| Jack Gallagher | ... | Evictee (uncredited) | |
| John Gannon | ... | Orderly (uncredited) | |
| Stewart Garner | ... | Communications Officer (uncredited) | |
| Kenneth Gibson | ... | President Truman's Secretary (uncredited) | |
| Tom Gibson | ... | Minor Role (uncredited) | |
| Frederick Giermann | ... | Nazi Officer (uncredited) | |
| Bob Gilbert | ... | Lieutenant, R.C.M., Enola Gay (uncredited) | |
| Jon Gilbreath | ... | Attendant (uncredited) | |
| William Graeff Jr. | ... | Emergency Switch Operator (uncredited) | |
| Clarke Hardwicke | ... | Enola Gay Co-Pilot (uncredited) | |
| Harry Hayden | ... | Harried Editor (uncredited) | |
| Bill Hickman | ... | Barometric Observer (uncredited) | |
| Russell Hicks | ... | General (uncredited) | |
| Earle Hodgins | ... | Gate Guard (uncredited) | |
| James Horne Jr. | ... | Barmetric Observer (uncredited) | |
| Anne Howard | ... | English Laboratory Assistant (uncredited) | |
| Jimmy Hunt | ... | Little Boy (uncredited) | |
| Selmer Jackson | ... | Senior Engineer (uncredited) | |
| John James | ... | Engineer (uncredited) | |
| William Janssen | ... | Instrument Operator (uncredited) | |
| Bobby Jordan | ... | Radioman on Tinian Receiving A-Bomb Message (uncredited) | |
| Tommy Kelly | ... | Mack (uncredited) | |
| Mike Killian | ... | Senior Engineer (uncredited) | |
| Martin Kosleck | ... | Dr. O.E. Frisch (uncredited) | |
| Paul Kruger | ... | Construction Engineer (uncredited) | |
| Al Kunde | ... | Evictee (uncredited) | |
| Nolan Leary | ... | Townsman (uncredited) | |
| William F. Leicester | ... | Enola Gay Flight Engineer (uncredited) | |
| Frank Leigh | ... | British General (uncredited) | |
| James B. Leong | ... | Japanese Army Officer (uncredited) | |
| Weaver Levy | ... | Japanese Sailor (uncredited) | |
| Donald S. Lewis | ... | Secret Service Man (uncredited) | |
| King Lockwood | ... | Col. Nichols (uncredited) | |
| Richard Loo | ... | Japanese Officer (uncredited) | |
| Robert Malcolm | ... | Keith (uncredited) | |
| Jack Manolas | ... | Minor Role (uncredited) | |
| Chris-Pin Martin | ... | Mexican Man (uncredited) | |
| Louis Mason | ... | Workman (uncredited) | |
| Roger McGee | ... | Scientist (uncredited) | |
| Michael McGrath | ... | Dr. Kistiakonsky (uncredited) | |
| Malcolm 'Bud' McTaggart | ... | Radio Operator (uncredited) | |
| Patricia Medina | ... | Mrs. Wyatt (uncredited) | |
| Danny Merrill | ... | Scientist (uncredited) | |
| Sybil Merritt | ... | Cute Guide (uncredited) | |
| Torben Meyer | ... | Milkman (uncredited) | |
| Howard M. Mitchell | ... | Townsman (uncredited) | |
| Forbes Murray | ... | Briefing Officer (uncredited) | |
| Merlyn Nelson | ... | Evictee (uncredited) | |
| James Nolan | ... | President Roosevelt's Bodyguard (uncredited) | |
| Wedgwood Nowell | ... | Industrialist (uncredited) | |
| Larry Nunn | ... | Worried GI (uncredited) | |
| Fred Nurney | ... | Nazi Officer (uncredited) | |
| Ray Page | ... | Meter Man (uncredited) | |
| Eddie Parks | ... | Bewildered Civilian (uncredited) | |
| Charles Peck | ... | GI Messenger (uncredited) | |
| Ray Pemberton | ... | Electronics Engineer (uncredited) | |
| Bob Pepper | ... | Crewman (uncredited) | |
| George Peters | ... | Nurse (uncredited) | |
| Tom Pilkington | ... | Man with Counter (uncredited) | |
| Otto Reichow | ... | Nazi Officer (uncredited) | |
| William Roberts | ... | Enola Gay Radio Operator (uncredited) | |
| Ellen Ross | ... | Waitress (uncredited) | |
| Carl Saxe | ... | German General's Aide (uncredited) | |
| Frank J. Scannell | ... | Winne (uncredited) | |
| Jerry Schumacher | ... | Nazi Officer (uncredited) | |
| Hans Schumm | ... | Nazi Police Officer (uncredited) | |
| Dorothy Scott | ... | Laboratory Assistant (uncredited) | |
| Robin Short | ... | Young Scientist (uncredited) | |
| Buster Slaven | ... | Enola Gay Assistant Gunner (uncredited) | |
| Lew Smith | ... | Wolfish Soldier (uncredited) | |
| Eunice Soo-Hoo | ... | Japanese Child (uncredited) | |
| Robert Spencer | ... | Nuclear Scientist (uncredited) | |
| Jack Sterling | ... | Enola Gay Tail Gunner (uncredited) | |
| Cedric Stevens | ... | Evictee (uncredited) | |
| William Tannen | ... | Loudspeaker Voice (voice) (uncredited) | |
| Richard Terry | ... | Enola Gay Radarman (uncredited) | |
| David Thursby | ... | English Bobby (uncredited) | |
| Frank Tomlinson | ... | Minor Role (uncredited) | |
| George Travell | ... | Tinian Co-Pilot (uncredited) | |
| H.T. Tsiang | ... | Prof. Okani (uncredited) | |
| George Turner | ... | Pilot (uncredited) | |
| Harry Tyler | ... | Man (uncredited) | |
| William Van Vleck | ... | Evictee (uncredited) | |
| Leslie Vincent | ... | English Junior Scientist (uncredited) | |
| Emmett Vogan | ... | Medical Major (uncredited) | |
| Hans von Morhart | ... | Danish Customs Man (uncredited) | |
| Eddy Waller | ... | Man (uncredited) | |
| Constance Weiler | ... | Minor Role (uncredited) | |
| Harry T. Wensel | ... | Wensel (uncredited) | |
| Carl Wester | ... | Construction Engineer (uncredited) | |
| Guy Williams | ... | Enola Gay Bombardier (uncredited) | |
| Ronald Wong | ... | Japanese Child (uncredited) | |
| Jack Worth | ... | Nazi Officer (uncredited) | |
Produced by | |||
| Samuel Marx | .... | producer | |
Original Music by | |||
| Daniele Amfitheatrof | |||
Cinematography by | |||
| Ray June | |||
Film Editing by | |||
| George Boemler | |||
Art Direction by | |||
| Cedric Gibbons | |||
| Hans Peters | |||
Set Decoration by | |||
| F. Keogh Gleason | (as Keogh Gleason) | ||
| Edwin B. Willis | |||
Makeup Department | |||
| Jack Dawn | .... | makeup creator | |
Production Management | |||
| Sergei Petschnikoff | .... | unit manager (uncredited) | |
Second Unit Director or Assistant Director | |||
| Stanley Goldsmith | .... | assistant director (uncredited) | |
| Frank E. Myers | .... | assistant director (uncredited) | |
Sound Department | |||
| Douglas Shearer | .... | recording director | |
Special Effects by | |||
| A. Arnold Gillespie | .... | special effects | |
| Donald Jahraus | .... | special effects | |
| Warren Newcombe | .... | special effects | |
Camera and Electrical Department | |||
| Paul Mantz | .... | aerial director of photography | |
Casting Department | |||
| Bobby Webb | .... | casting (uncredited) | |
Costume and Wardrobe Department | |||
| Irene | .... | costume supervisor | |
Editorial Department | |||
| Peter Ballbusch | .... | montage | |
Music Department | |||
| Sidney Cutner | .... | orchestrator (uncredited) | |
| Leo Shuken | .... | orchestrator (uncredited) | |
Other crew | |||
| William A. Consodine | .... | technical advisor: military | |
| David Hawkins | .... | scientific technical advisor (as Dr. David Hawkins) | |
| W. Bradford Shank | .... | scientific technical advisor | |
| Charles W. Sweeney | .... | technical advisor: military | |
| Edward R. Tompkins | .... | scientific technical advisor (as Dr. Edward R. Tompkins) | |
| H.T. Wensel | .... | scientific technical advisor (as Dr. H.T. Wensel) | |
| Paul Van Sloun | .... | technical advisor (uncredited) | |
| Hal B. Wallis | .... | advisor (uncredited) | |
Thanks | |||
| Tony Owen | .... | acknowledgment: for his cooperation | |
| Company credits | Technical specifications | Main details |