John Hurt

Narrator (voice)

Shuntaro Hida

Self - Hiroshima Survivor

Robert Austin

Winston Churchill

George Anton

Parsons

George Elsey

Self - Military Advisor

Paul Tibbets

Self - Pilot, Enola Gay

Theodore "Dutch" Van Kirk

Self - Navigator, Enola Gay

Akiko Takakura

Self - Hiroshima Survivor

Daniel Ben Zenou

Beser

Ed Bishop

Stimson

Katsumi Cho

Admiral Yonai

Noboru Akima

General Anami

Lee Colley

Van Kirk

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)