Self - Narrator (voice)

Paul Frees

Acting

Interviewer

Jon Else

Directing

Self (archive footage)

J. Robert Oppenheimer

Acting

Self

Hans Bethe

Acting

Self

Frank Oppenheimer

Acting

Self

Haakon Chevalier

Acting

Self

Robert Serber

Acting

Self

Holm Bursom

Acting

Self

Stirling Colgate

Acting

Self

Freeman Dyson

Acting

Self

Susan Evans

Acting

Self

Francis Fergusson

Acting

Self (archive footage)

Leslie Groves

Acting

Self

Elizabeth Ingram

Acting

Self

Robert Krohn

Acting

Self

Dave MacDonald

Acting

Self (archive footage)

Joseph McCarthy

Acting

Self

Dorothy McKibben

Acting

Self

Robert Porton

Acting

Self

Isidor Isaac Rabi

Acting

Self (archive footage)

Harry S. Truman

Acting

Self

Francoise Ulam

Acting

Self

Stanislaw Ulam

Acting

Self

Jane Wilson

Acting

Self

Robert R. Wilson

Acting