 Cillian MurphyJ. Robert Oppenheimer | J. Robert Oppenheimer |
 Emily BluntKitty Oppenheimer | Kitty Oppenheimer |
 Matt DamonLeslie Groves | Leslie Groves |
 Robert Downey Jr.Lewis Strauss | Lewis Strauss |
 Florence PughJean Tatlock | Jean Tatlock |
 Josh HartnettErnest Lawrence | Ernest Lawrence |
 Casey AffleckBoris Pash | Boris Pash |
 Rami MalekDavid Hill | David Hill |
 Kenneth BranaghNiels Bohr | Niels Bohr |
 Benny SafdieEdward Teller | Edward Teller |
 Jason ClarkeRoger Robb | Roger Robb |
 Dylan ArnoldFrank Oppenheimer | Frank Oppenheimer |
 Tom ContiAlbert Einstein | Albert Einstein |
 James D'ArcyPatrick Blackett | Patrick Blackett |
 David DastmalchianWilliam Borden | William Borden |
 Dane DeHaanKenneth Nichols | Kenneth Nichols |
 Alden EhrenreichSenate Aide | Senate Aide |
 Tony GoldwynGordon Gray | Gordon Gray |
 Jefferson HallHaakon Chevalier | Haakon Chevalier |
 David KrumholtzIsidor Rabi | Isidor Rabi |
 Matthew ModineVannevar Bush | Vannevar Bush |
 Scott GrimesCounsel | Counsel |
 Kurt KoehlerThomas Morgan | Thomas Morgan |
 John GowansWard Evans | Ward Evans |
 Macon BlairLloyd Garrison | Lloyd Garrison |
 Harry GroenerSenator McGee | Senator McGee |
 Gregory JbaraChairman Magnuson | Chairman Magnuson |
 Ted KingSenator Bartlett | Senator Bartlett |
 Tim DeKaySenator Pastore | Senator Pastore |
 Steven HouskaSenator Scott | Senator Scott |
