American Playhouse

Robert Oppenheimer / John Honeyman

Alger Hiss / The Headmaster

Narrator (voice)

Edward Teller / Joe

Kitty Oppenheimer / Kitty Harrison

Enrico Fermi

Colonel Kenneth Nichols

Widow Douglas / Fanny Church

Agnes Wood / Elizabeth Vaughn

Peter / Daniel Cooper (segment 'Peacemaker')

Bert Franklin / Nolan

Robert Serber

General Leslie Groves

Hans Bethe

Aunt Josephine / Mrs. Rice

Jack / Judge Dennis

Pap Finn / Buster McGuire

Lovely Mead / Wallace Kirkman

Mr. Tapping / Julian Hyde

Judge Mark Driscoll / Edward

Robert Wilson

Frank Oppenheimer

Ernest Lawrence

Isidor Rabi