The Beginning or the End › Cast
Brian Donlevy
Maj. Gen. Leslie R. Groves
Robert Walker (actor, born 1918)
Col. Jeff Nixon
Tom Drake
Matt Cochran
Beverly Tyler
Anne Cochran
Audrey Totter
Jean O'Leary
Hume Cronyn
Dr. J. Robert Oppenheimer
Hurd Hatfield
Dr. John Wyatt
Joseph Calleia
Dr. Enrico Fermi
Godfrey Tearle
President Franklin D. Roosevelt
Victor Francen
Dr. Marré
Richard Haydn
Dr. Chisholm
Jonathan Hale
Dr. Vannevar Bush
John Litel
K.T. Keller, K. T. Keller