Campbell Scott
Self - Narrator (voice)
Boyd Gaines
Chairman Gray (voice)
Daniel Gerroll
Colonel Pash
Michael Stuhlbarg
Edward Teller
Ellen Katz
The Stenographer
Michael Cumpsty
Harold Agnew
Self
Jeremy Bernstein
Freeman Dyson
Richard Rhodes
Martin J. Sherwin
Joseph McCarthy
Self (archive footage)
J. Robert Oppenheimer
David Strathairn
