The Beginning or the End

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

Cedric Gibbons Art Direction Norman Taurog Director Edwin B. Willis Set Decoration