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 Michael Lindall as Agent McKee Aidan McArdle as Dr. Thomas Harvey Neal Huff as Robert Oppenheimer Joseph Arkley as David Bohm Dixie Egerickx as Alice Edwards Co Starring Nancy Crane as Eleanor Roosevelt Sinéad Phelps as Secretary Bob Boudreaux as Congressman Rankin Roy McCrerey as Committee Chair Jasmin von der Born as Frieda Einstein Howard Lotker as Reporter Andrew Boyer as Doctor Gary Fannin as Technician Stewart Alexander as Harold Urey Cornelius Geaney, Jr. as Assistant Director 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 MaryKathryn Kopp as Nurse Magnus Af Sandeberg as Male Secretary
