• 
  David Lowell Rich

  regizor

• 
  Billy Crystal

  Jacob 'Jake' Beser
• 
  Gregory Harrison

  Captain Bob Lewis
• 
  Gary Frank

  Major Tom Ferebee
• 
  Kim Darby

  Lucy Tibbets
• 
  Michael Currie
• 
  Ed Nelson (VI)

  President Harry S Truman
• 
  Stephen Keep Mills

• 
  James Shigeta

  Field Marshall Abehata
• 
  John Fujioka

  General Nagai
• 
  Robert Walden

  J. Robert Oppenheimer
• 
  Stephen Macht

  Major Wiiliam 'Bud' Uanna
• 
  James Saito

  Lieutenant Tatsuo Yamato
• 
  Richard Herd

  General Groves
• 
  Michael Tucci

  Captain Claude Eatherly

• 
  Robert Pine

  Captain William 'Deke' Parsons

• 
  Lynn Stalmaster

  casting director
• 
  Maurice Jarre

  departament sunet
• 
  Tom Noga

  cascador
• 
  James Poe

  scriitor
• 
  Millard Kaufman

  scriitor