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