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Cast

• Brian Dennehy
  as Gen. Leslie Groves
• David Strathairn
  as J. Robert Oppenheimer
• Michael Tucker (I)
  as Leo Szilard
• Hume Cronyn
  as James F. Byrnes
• Richard Dysart
  as Harry S. Truman
• Hal Holbrook
  as Gen. George Marshall
• Jon Baggaley
  as James Tuck
• David Bolt
  as Harry Gold
• Peter Boretski
  as Albert Einstein
• Lorne Brass
  as Klaus Fuchs
• Patrick Breen
  as Richard Feynman
• Tom Butler
  as Captain DeSilva
• Bob Clout
  as Alfred MacCormack
• Lawrence Z. Dane
• Norris Domingue
  as General Pa Watson
• David Ferry
  as Army Major
• David Gow
  as Jack Wisnovsky
• Roland Hewgill
  as Army General
• Barnard Hughes
  as Secretary Stimpson
• Olek Krupa
• Bernie McInerney
• John McMartin
• Isabelle Mejias
  as Mrs. Trowbridge
• Robert Morelli
  as T.O. Jones
• Frederick Neumann
  as Alexander Sachs
• Ken Pogue
• Gary Reineke
• Michael J. Reynolds
  as Kenneth Bainbridge
• George R. Robertson
  as Ed Condon
• Alan Scarfe
• Tony Shalhoub
• Michael Sinelnikoff
  as Lord Rutherford
• Philip Spensley
  as British Sr. Officer
• David Ogden Stiers
  as FDR
• Scott Thomson
  as Chemist
• Anne Twomey
• Vlasta Vrana
  as Hans Bethe
• Timothy Webber
  as Colonel Lansdale
• Ron White
• Jonathan Wise
  as Robert Serber
• Ronald C. Frazier
• John Seitz
• Joe Cazalet
  as Air Force Guard
• Stefan Balint
  as Eugen Wigner
• Graham Haley
  as Haakon Chevalier
• Francois Klanfer
  as Haagen
• Terence Labrosse
  as Allan Dulles
• George Popovich
  as Samuel Goudsmit
• Dee McCaffrey
  as William "Deke" Parsons
• John Pielmeier
• Richard A. Dysart
• Ron Frazier

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