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