Eliot Kohen

Narrator (voice)

J. Robert Oppenheimer

Self (archive footage)

Frank Oppenheimer

Self

Hans Bethe

Self

Edward Teller

Self

Isidor Isaac Rabi

Self

Emilio Segrè

Self

Harold Agnew

Self

Stanislaw Ulam

Self

Victor Weisskopf

Self

George Kistiakowsky

Self

Philip Morrison

Self

Priscilla Duffield

Self

Dorothy McKibbin

Self

Robert R. Wilson

Self

Edwin McMillan

Self

Robert Bacher

Self