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