Robert Oppenheimer
Narrator
Ed Condon
Henry Stimson
Kitty Oppenheimer
Lewis Strauss
Enrico Fermi
Edward Teller
Lloyd Garrison
George Kistiakowsky
Isidor Rabi
Ernest Lawrence
Hans Bethe
Steve Nelson
Frank Oppenheimer
Colonel John Lansdale
Joseph Volpe
John Manley
Seth Neddermeyer
Colonel Kenneth Nichols
H.U.A.C Counsel
