Casts
Brian Donlevy
as Maj. Gen. Leslie R. Groves
Robert Walker
as Col. Jeff Nixon
Tom Drake
as Matt Cochran
Beverly Tyler
as Anne Cochran
Hume Cronyn
as Dr. J. Robert Oppenheimer
Audrey Totter
as Jean O'Leary
Hurd Hatfield
as Dr. John Wyatt
Joseph Calleia
as Dr. Enrico Fermi
Godfrey Tearle
as President Franklin D. Roosevelt
Victor Francen
as Dr. Marre
