Guest Stars T.R. Knight as J. Edgar Hoover David Dencik as Niels Bohr Jodhi May as Helen Dukas Nikola Djuricko as Leo Szilard Jolyon Coy as Max Laue Rob LaBelle as Henry Morgenthau Robert Picardo as Abraham Flexner Adam Garcia as Moe Berg Ania Bukstein as Margarita Konenkova John Sackville as R. Davis Halliwell Karel Dobrý as Mikhail Ivanushkin Christian Rubeck as Werner Heisenberg Co Starring Lucy Farrett as Older Margot Nancy Crane as Eleanor Roosevelt Zita Téby as Older Ilse Jim High as British Guard Georg Nikoloff as Sergei Konenkov Miles Richardson as Vannever Bush Bryan Bounds as Judge Mitchell Mullen as Franklin Roosevelt Stephen Chance as Paul Scherrer Gunnar Cauthery as Joseph Goebbels Tom Knight as Waspy Donor Charlie Field as Carl Von Weizsacker David Hunt as General Leslie Groves Timo Willman as Young Nazi Steve Mirer as Doctor Daniel Kötter as Gestapo Officer