Hervé Lacroix
Narrator (voice)
Albert Einstein
Self (archive footage)
Joseph Stalin
Self (archive footage)
Franklin D. Roosevelt
Self (archive footage)
Adolf Hitler
Self (archive footage)
Pyotr Vasilyevich Zarubin
Self - Son of Elizabeth Zarubina
Nikolai Bondarenko
Self - Historian and Journalist
Alexandre Adler
Self - Historian and Journalist
Nikolai Dolgopolov
Self - Author and Journalist
Patrick Pesnot
Self - Author and Journalist
Alan B. Carr
Self - Historian
Leó Szilárd
Self (archive footage)
Leslie Groves
Self - Director of the Manhattan Project (archive footage)
Jon Hunner
Self - Historian
J. Robert Oppenheimer
Self (archive footage)
Klaus Fuchs
Self - Theoretical Physicist and Atomic Spy (archive footage)
Claire Morin
Elizabeth Zarubina (voice)
