Guest Stars T.R. Knight as J. Edgar Hoover Sally Dexter as Older Mileva David Dencik as Niels Bohr Jodhi May as Helen Dukas Nikola Djuricko as Leo Szilard Joshua Akehurst as Hans Albert Einstein (Age 15) Ed Stoppard as Adult Hans Albert Einstein Aidan McArdle as Dr. Thomas Harvey Neal Huff as Robert Oppenheimer Michael Lindall as Agent McKee Dixie Egerickx as Alice Edwards Joseph Arkley as David Bohm Co Starring Nancy Crane as Eleanor Roosevelt Sinéad Phelps as Secretary Kit Ross as Younger Albert Einstein Roy McCrerey as Committee Chair Magnus Af Sandeberg as Male Secretary MaryKathryn Kopp as Nurse Howard Lotker as Reporter Bob Karper as Field Director Markus Pfeiffer as Young Hermann Einstein Joshua Glenister as Bernhard Einstein Carla Dixon as Evelyn Einstein Jasmin von der Born as Frieda Einstein Cornelius Geaney, Jr. as Assistant Director Andrew Boyer as Doctor Gary Fannin as Technician Stewart Alexander as Harold Urey Bob Boudreaux as Congressman Rankin
