שחקנים
David Gow
Jack Wisnovsky
Hal Holbrook
Gen. George Marshall
Barnard Hughes
Henry Stimson
טוני שלהוב
Enrico Fermi
Vlasta Vrana
Hans Bethe
Lawrence Dane
Olek Krupa
Edward Teller
דייוויד סטראתיירן
J. Robert Oppenheimer
George R. Robertson
Ed Condon
Gary Reineke
Groves's Commanding Officer
Dee McCafferty
William 'Deke' Parsons
John Seitz
Ralph A. Bard
Roland Hewgill
Army General
Lorne Brass
Klaus Fuchs
Lia Sargent
Mrs. Wisnovsky
Jonathan Wise
Robert Serber
Scott Thomson
Chemist
Ron White
Colonel Nichols
Isabelle Mejias
Mrs. Trowbridge
Heinar Piller
Fleischmann
Richard Dysart
President Harry S. Truman
Romano Orzari
Leo Szilard's Prime Scientist (uncredited)
Michael Sinelnikoff
Lord Rutherford
Brian Dennehy
Gen. Leslie Groves
Michael Tucker
Leo Szilard
Michael J. Reynolds
Kenneth Bainbridge
יום קרונין
James F. Byrnes
דיוויד אוגדן סטיירס
Franklin D. Roosevelt
טום באטלר
Captain DeSilva
Bernie McInerney
Alan Scarfe
Arthur Holden
Scientist (uncredited)
Ken Pogue
Dwight D. Eisenhower
Patrick Breen
Richard Feynman
David Ferry
Army Major
John McMartin
Dr. Arthur Compton
Ron Frazier
Colonel Pash
Timothy Webber
Colonel Lansdale
Harry Standjofski
Robert Wilson
Anne Twomey
Kitty Oppenheimer