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