Trailer
Cast
Henry O'Neill
Gen. Thomas F. Farrell
Brian Donlevy
Maj. Gen. Leslie R. Groves
Robert Walker
Col. Jeff Nixon
Hume Cronyn
Dr. J. Robert Oppenheimer
Joseph Calleia
Dr. Enrico Fermi
Warner Anderson
Capt. William S. Parsons
Ellen Ross
Waitress
Godfrey Tearle
President Franklin D. Roosevelt
Victor Francen
Dr. Marre
Jonathan Hale
Dr. Vannevar Bush
Tom Drake
Matt Cochran
Beverly Tyler
Anne Cochran
Hurd Hatfield
Dr. John Wyatt
John Litel
K.T. Keller
Bobby Jordan
Radioman on Tinian Receiving A-Bomb Message
Audrey Totter
Jean O'Leary
Richard Haydn
Dr. Chisholm