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)