Sam WaterstonRobert Oppenheimer Vincenzo FiorilloEd Condon Alexander KnoxHenry Stimson Jana SheldenKitty Oppenheimer Edward HardwickeEnrico Fermi David SuchetEdward Teller James MaxwellLloyd Garrison Milton JohnsGeorge Kistiakowsky Bob ShermanErnest Lawrence Matthew GuinnessHans Bethe Christopher MalcolmSteve Nelson Garrick HagonFrank Oppenheimer David BaxtColonel John Lansdale Colin BennettSeth Neddermeyer Christopher MunckeColonel Kenneth Nichols Peter CarlisleH.U.A.C Counsel Peter GoodchildExekutiv producent Nicholas MallettProduction Assistant 
