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