Hungarian physicist Leo Szilard leaves Europe, eventually arriving in the United States. With the help of Einstein, he persuades the government to build an atomic bomb. The project is given to no-nonsense Gen. Leslie Groves who selects physicist J. Robert Oppenheimer to head the Los Alamos Laboratory in New Mexico, where the bomb is built. As World War II draws to a close, Szilard has second thoughts about atomic weapons, and policy makers debate how and when to use the bomb.
as Gen. Leslie Groves
as J. Robert Oppenheimer
as Leo Szilard
as James F. Byrnes
as President Harry S. Truman
as Gen. George Marshall
as Henry Stimson
as Dr. Arthur Compton
as Franklin D. Roosevelt
as Kitty Oppenheimer
as Colonel Pash
as Edward Teller
as Seth
as Dwight D. Eisenhower
as Groves's Commanding Officer
as Ralph A. Bard
as Enrico Fermi
as Trude Weiss
as Colonel Nichols
as Eugen Wigner
as Albert Einstein
as Richard Feynman
as Hans Bethe
as Samuel Goudsmit
as Klaus Fuchs
as Lord Rutherford
as Haakon Chevalier
as Michael Polanyi
as Ilse Polanyi
as Colonel Lansdale
as Robert Wilson
as Mrs. Wisnovsky
as Jack Wisnovsky
as Shapp
as Mrs. Trowbridge
as Robert Serber
as Ed Condon
as William 'Deke' Parsons
as Captain DeSilva
as T. O. Jones
as James Tuck
as Harry Gold
as Army Major
as Fleischmann
as Haagen Kistiakowski
as George Kistiakowski
as Kenneth Bainbridge
as William D. Leahy
as Paul Tibbets
as Air Force Guard
as Chemist
as Alfred MacCormack
as Army General
as John J. McCloy
as Allan Dulles
as London Pedestrian
as British Jr. Officer
as British Sr. Officer
as Alexander Sachs
as General Pa Watson
as Los Alamo Scientist (uncredited)
as Scientist (uncredited)
as Leo Szilard's Prime Scientist (uncredited)
