- Predrag 'Miki' Manojlovic
- Â Edward Teller 3 episodes, 1987
- Jean-Paul Muel
- Â Leo Szilard 3 episodes, 1987
- Maury Chaykin
- Â General Leslie Groves 3 episodes, 1987
- Tom Rack
- Â Robert Oppenheimer 3 episodes, 1987
- Pier Paolo Capponi
- Â Enrico Fermi 3 episodes, 1987
- Myriam Mézières
- Â Gertrude Weiss 3 episodes, 1987
- Géza Kovács
- Â Otto Frisch 3 episodes, 1987
- Vincent Grass
- Â Hans Bethe 3 episodes, 1987
- Marie Bunel
- Â Mici Teller 3 episodes, 1987
- Denis Forest
- Â Klaus Fuchs 3 episodes, 1987
- Peter Dvorsky
- Â Ernest Lawrence 3 episodes, 1987
- Amy Werba
- Â Laura Fermi 3 episodes, 1987
- Jean-Gabriel Nordmann
- Â John von Neumann 3 episodes, 1987
- Denis Manuel
- Â Albert Einstein 3 episodes, 1987
- Barry Morse
- Â Secretary Stimson 3 episodes, 1987
- Denis Bouchard
- Â Louis Slotin 2 episodes, 1987
- Michael Ironside
- Â Werner Heisenberg 2 episodes, 1987
- Lloyd Bochner
- Â General Curtis LeMay 2 episodes, 1987
- Peter Chatel
- Â Carl von Weizsacker 2 episodes, 1987
- Rosemary Dunsmore
- Â Jean O'Leary 2 episodes, 1987
- Maryline Even
- Â Irene Joliot-Curie 2 episodes, 1987
- Vjenceslav Kapural
- Â George Kistiakowsky 2 episodes, 1987
- Jacques Perrin
- Â Frederic Joliot-Curie 2 episodes, 1987
- Perica Martinovic
- Â Rose Bethe 2 episodes, 1987
- Michael Morris
- Â Company Executive 2 episodes, 1987
- Relja Basic
- Â Harry Gold 2 episodes, 1987
- Jim Kaufman
- Â Norris Bradbury 2 episodes, 1987
- Maud Rayer
- Â Lise Meitner 1 episode, 1987
- Leslie Nielsen
- Â Lewis Strauss 1 episode, 1987
- Ian Marshall
- Â James Chadwick 1 episode, 1987
- Tomasz Bialkowski
- Â Stanislaw Ulam 1 episode, 1987
- Alan Rossett
- Â Arthur Compton 1 episode, 1987
- Jean-Claude Deret
- Â Niels Bohr 1 episode, 1987
- Tom Stojkovic
- Â James Skardon 1 episode, 1987
- Jean-Louis Rolland
- Â Earl of Suffolk 1 episode, 1987
- Charles Millot
- Â Otto Hahn 1 episode, 1987
- Robert Barr
- Â James Byrnes 1 episode, 1987
- Joe Sheridan
- Â M.P. Officer 1 episode, 1987
- Allan Eastman
- Â Col. Paul Tibbets 1 episode, 1987
- Bruno Balp
- Â War Minister 1 episode, 1987
- Norman Stokle
- Â Pentagon General 1 episode, 1987
- Huguette Faget
- Â Marie Curie 1 episode, 1987
- Ronald Cohen
- Â Capt. William Parsons 1 episode, 1987
- William Doherty
- Â Weapons Testing Colonel 1 episode, 1987
- David Novek
- Â Congressman 1 episode, 1987
- François Dalou
- Â Company President 1 episode, 1987
- Cynthia Ashperger
- Â Jean Tatlock 1 episode, 1987
- Anna Gaylor
- Â Landlady 1 episode, 1987
- Silvije Petranovic
- Â Young Nazi (uncredited) 1 episode, 1987
- Boris Bakal
- Â Young Scientist (uncredited) 1 episode, 1987