All Cast
Paul Frees
Self - Narrator (voice)
Jon Else
Interviewer
J. Robert Oppenheimer
Self (archive footage)
Hans Bethe
Self
Frank Oppenheimer
Self
Haakon Chevalier
Self
Robert Serber
Self
Holm Bursom
Self
Stirling Colgate
Self
Freeman Dyson
Self
Susan Evans
Self
Francis Fergusson
Self
Leslie Groves
Self (archive footage)
Elizabeth Ingram
Self
Robert Krohn
Self
Dave MacDonald
Self
Joseph McCarthy
Self (archive footage)
Dorothy McKibben
Self
Robert Porton
Self
Isidor Isaac Rabi
Self
Harry S. Truman
Self (archive footage)
Francoise Ulam
Self
Stanislaw Ulam
Self
Jane Wilson
Self