출연진
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