John Hurt

Narrator (voice)

Shuntaro Hida

Self - Hiroshima Survivor

George Anton

Parsons

Paul Tibbets

Self - Pilot, Enola Gay

Daniel Ben Zenou

Beser

Ed Bishop

Stimson

長克巳

Admiral Yonai

Garry Cooper

Groves

Kenneth Jay

Harry Truman

Haruka Kuroda

Akiko Takakura

Tim Matthews

Major Thomas Ferebee

Shane Rimmer

James F. Byrnes

Fredrick Ruth

Robert Oppenheimer

J. Robert Oppenheimer

Self (archive footage)

Harry S. Truman

Self (archive footage)

Emperor Hirohito of Japan

Self (archive footage)