The Beginning or the End

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

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