• 
  Joseph Sargent

  regizor

• 
  David Strathairn

  J. Robert Oppenheimer
• 
  Tony Shalhoub

  Enrico Fermi
• 
  John Seitz
• 
  Richard Dysart

  President Harry S. Truman
• 
  Hal Holbrook

  Gen. George Marshall
• 
  Gary Reineke

  Dwight D. Eisenhower
• 
  David Gow

  Jack Wisnovsky

• 
  Timothy Webber

  Colonel Lansdale
• 
  Alan Scarfe
• 
  Anne Twomey

  Kitty Oppenheimer
• 
  David Ogden Stiers

  President Franklin D. Roosevelt
• 
  Michael J. Reynolds

  Kenneth Bainbridge
• 
  Brian Dennehy

  Gen. Leslie Groves
• 
  John Pielmeier

  Seth

• 
  Ken Pogue

  Groves's Commanding Officer
• 
  Barnard Hughes

  Secretary Stimpson
• 
  Lia Sargent

  Mrs. Wisnovsky
• 
  George R. Robertson

  Ed Condon
• 
  Vlasta Vrana

  Hans Bethe
• 
  Bernie McInerney
• 
  Norris Domingue

  General Pa Watson
• 
  David Ferry

  Army Major
• 
  Lorne Brass

  Klaus Fuchs
• 
  Patrick Breen

  Richard Feynman
• 
  Michael Tucker

  Leo Szilard
• 
  Hume Cronyn

  James F. Byrnes
• 
  Jon Baggaley

  James Tuck
• 
  Kliment Denchev

  Michael Polanyi
• 
  Ron White

  Colonel Nichols
• 
  Olek Krupa

  Edward Teller
• 
  Lawrence Dane
• 
  John McMartin

  Dr. Arthur Compton
• 
  Tom Butler

  Captain DeSilva
• 
  Harry Standjofski

  Robert Wilson

• 
  Guy Lalande

  art director
• 
  Kees Van Oostrum

  imagine
• 
  Mason Daring

  departament sunet
• 
  Renée April

  costume
• 
  Mario Davignon

  costume and wardrobe departmen
• 
  Aaron Spelling

  producător
• 
  E. Duke Vincent

  producător
• 
  Josette Perrotta

  producător
• 
  David W. Rintels

  producător
• 
  Josette Perrotta

  production manager
• 
  Ken Gord

  production manager
• 
  Mike Williams

  second unit director or assist
• 
  Stephen Lawrence

  sound department
• 
  Louis Craig

  special effects
• 
  Mario Dumont

  special effects
• 
  David W. Rintels

  scriitor