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