Through interviews with Manhattan Project scientists and newly declassified archival footage, this documentary examines the life of physicist J. Robert Oppenheimer and his leadership of the Manhattan Project. The film traces the development and testing of the first atomic bomb and follows Oppenheimer’s later opposition to nuclear proliferation during the early years of the Cold War.
| Actor | Role |
|---|---|
 Paul FreesSelf - Narrator (voice) | Self - Narrator (voice) |
 Jon ElseSelf - Interviewer | Self - Interviewer |
 J. Robert OppenheimerSelf (archive footage) | Self (archive footage) |
 Hans BetheSelf | Self |
 Frank OppenheimerSelf | Self |
 Haakon ChevalierSelf | Self |
 Robert SerberSelf | Self |
| HHolm BursomSelf | Self |
| SStirling ColgateSelf | Self |
 Freeman DysonSelf | Self |
| SSusan EvansSelf | Self |
| FFrancis FergussonSelf | Self |
 Leslie GrovesSelf (archive footage) | Self (archive footage) |
| EElizabeth IngramSelf | Self |
| RRobert KrohnSelf | Self |
| DDave MacDonaldSelf | Self |
 Joseph McCarthySelf (archive footage) | Self (archive footage) |
| DDorothy McKibbenSelf | Self |
| RRobert PortonSelf | Self |
 Isidor Isaac RabiSelf | Self |
 Harry S. TrumanSelf (archive footage) | Self (archive footage) |
| FFrancoise UlamSelf | Self |
| SStanislaw UlamSelf | Self |
| JJane WilsonSelf | Self |
| RRobert R. WilsonSelf | Self |