Obsada:

• John Hurt Narrator
• Noboru Akima General Anami
• George Anton Parsons
• Fred Ashworth Himself - Crewmember of the Enola Gay
• Robert Austin Winston Churchill
• Daniel Ben Zenou Beser
• Ed Bishop Stimson
• Katsumi Chô Admiral Yonai
• Lee Colley Van Kirk
• Garry Cooper Groves
• Gus Danowski Jeppson
• Tim Davenport Captain Bob Lewis
• George Elsey Himself
• Michael Fitzpatrick Farrell
• Teruko Fujii Herself - Student in Hiroshima
• Russell Gackenback Himself - Navigator of the Enola Gay
• Dr. Shuntaro Hida Himself - Army doctor in Hiroshima
• Hirohito Hirohito Himself
• Kenneth Jay Harry Truman
• Morris Jeppson Himself - Crewmember of the Enola Gay
• Sachi Kimura Takakura's friend
• Haruka Kuroda Akiko Takakura
• Kinuko Laskey Herself - Nurse in Hiroshima
• Tim Matthews Major Thomas Ferebee
• Martin McDougall Le May
• Eric Meyers Fermi
• Naoko Mori Shige Hiratsuka
• Hirofumi Muraka Dr. Shuntaro Hida
• David Nicolle Carron
• Junichi Oboshi Soldier Rescuer
• Miya Oishi Teruko Fujii
• J. Robert Oppenheimer Himself
• Toyotaka Ota Morio Ozaki
• Hocto Pearson Takashi Tanemori
• Shane Rimmer Byrnes
• Fredrick Ruth J. Robert Oppenheimer
• Minako Seki Nurse Kinuko
• Ian Shaw Colonel Paul Tibbetts
• Janet Suzman Japanese woman's
• Akiko Takakura Herself - Bank employee in Hiroshima
• Takashi Tanemori Himself - Pupil in Hiroshima
• Shigeru Terasawa Himself - Soldier in Hiroshima
• Clive Thompson George Elsey
• Paul Tibbets Himself - Pilot of the Enola Gay
• Harry S. Truman Himself
• Theodore Van Kirk Himself - Navigator of the Enola Gay
• Kenji Watanabe Shige's Husband
• Martin Wimbush General Sir Alan Brooke
• Waldemar Zalewski Josef Stalin
• Paul T.T. Easter Soldier / MP