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Brian Donlevy as Maj. Gen. Leslie R. Groves |
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Robert Walker as Col. Jeff Nixon |
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Tom Drake as Matt Cochran |
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Beverly Tyler as Anne Cochran |
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Hume Cronyn as Dr. J. Robert Oppenheimer |
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Audrey Totter as Jean O'Leary |
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Hurd Hatfield as Dr. John Wyatt |
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Joseph Calleia as Dr. Enrico Fermi |
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Godfrey Tearle as President Franklin D. Roosevelt |
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Victor Francen as Dr. Marre |
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Richard Haydn as Dr. Chisholm |
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Jonathan Hale as Dr. Vannevar Bush |
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John Litel as K.T. Keller |
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Henry O'Neill as Gen. Thomas F. Farrell |
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Warner Anderson as Capt. William S. Parsons |
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Ellen Ross as Waitress |
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Bobby Jordan as Radioman on Tinian Receiving A-Bomb Message |
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Jerry Schumacher as Nazi Officer |
| Directing | Norman Taurog | Director |
| Writing | Frank Wead | Writer |
| Production | Samuel Marx | Producer |
| Writing | Bob Considine | Story |
| Art | Cedric Gibbons | Art Direction |
| Art | F. Keogh Gleason | Set Decoration |
| Directing | Frank E. Myers | Assistant Director |
| Directing | Stanley Goldsmith | Assistant Director |
| Art | Edwin B. Willis | Set Decoration |
| Sound | Daniele Amfitheatrof | Original Music Composer |
| Art | Hans Peters | Art Direction |
| Camera | Ray June | Director of Photography |
| Editing | George Boemler | Editor |
