Full Credits
18 members

Brian Donlevy
Maj. Gen. Leslie R. Groves

Robert Walker
Col. Jeff Nixon

Tom Drake
Matt Cochran

Beverly Tyler
Anne Cochran

Hume Cronyn
Dr. J. Robert Oppenheimer

Audrey Totter
Jean O'Leary

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

Ellen Ross
Waitress

Bobby Jordan
Radioman on Tinian Receiving A-Bomb Message
Jerry Schumacher
Nazi Officer
13 members
Norman Taurog
Director
Frank E. Myers
Assistant Director
Stanley Goldsmith
Assistant Director
Frank Wead
Writer
Bob Considine
Story
Samuel Marx
Producer
Ray June
Director of Photography
Daniele Amfitheatrof
Original Music Composer
Cedric Gibbons
Art Direction
F. Keogh Gleason
Set Decoration
Edwin B. Willis
Set Decoration
Hans Peters
Art Direction
George Boemler
Editor