• 
  Roger Spottiswoode

  regizor

• 
  John Hopkins

  scenarist

• 
  Saul Rubinek

  Leo Szilard
• 
  Jaimz Woolvett

  George Caron
• 
  Lynne Adams

  Reporter
• 
  Allen Altman

  Joseph Stiborik
• 
  Wesley Addy

  Secretar de razboi Henry L. Stimson
• 
  James Bradford

  Adm. Ernest J. King

• 
  Mark Camacho

  Charles Sweeney
• 
  J. Winston Carroll

  Chief Justice Stone
• 
  Serge Christianssens

  Joseph Stalin
• 
  Dan Corby

  Marinar
• 
  Teddy Lee Dillon

  John Kuharek
• 
  Roger Dunn

  Reporter
• 
  Timothy West

  Prim Ministru Winston Churchill

• 
  Gary Reineke

  Capt. William 'Deke' Parsons
• 
  David Gow

  Col. Paul Tibbets
• 
  Akira Terao

  Taro Kishikawa
• 
  Akira Kubo

  Sadajiro Toyoda
• 
  Charles Edwin Powell

  Kermit Beahan
• 
  Ken Jenkins

  Secretary of State James F. Byrnes
• 
  Tom Rack

  Under Secretary of the Navy Ralph Bard
• 
  Hisashi Igawa

  Foreign Minister Shigenori Togo
• 
  Kei Sato

  Koichi Kido
• 
  Kurt Reis

  Gen. Thomas T. Handy
• 
  Dennis St John

  Walter Bartky
• 
  Tatsuo Matsumura

  Prime Minister Kantaro Suzuki
• 
  Leon Pownall

  Gen. George C. Marshall
• 
  Sheena Larkin

  Bess Truman
• 
  Colin Fox

  Secretary of the Navy James Forrestal
• 
  George R. Robertson

  Adm. William D. Leahy
• 
  Vlasta Vrana

  Gen. Tom Farrell
• 
  Tim Post

  Thomas Ferebee
• 
  Richard Masur

  Gen. Leslie R. Groves
• 
  Frank Fontaine

  Reporter
• 
  Martin Sims

  Wyatt Duzenbury
• 
  Cedric Smith

  Gen. Curtis LeMay
• 
  Frank Schorpion

  Frederick Ashworth
• 
  Alain Goulem

  Robert Lewis
• 
  Jeffrey DeMunn

  J. Robert Oppenheimer
• 
  Ron Gabriel

  Press Secretary
• 
  Shigeru Kôyama

  Adm. Yonai
• 
  David Hemblen

  Steve Early
• 
  Richard Zeman

  Flight Engineer
• 
  Philip Pretten

  Charles Bohlen
• 
  David Siscoe

  Jacob Beser
• 
  Harry Standjofski

  Flight Surgeon Young
• 
  Leni Parker

  Margaret Truman