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 / Katherine Gerard

Agnes Wood / Elizabeth Vaughn

George Pierce Baker / Brently Mallard

Bert Franklin / Ted

Robert Serber

General Leslie Groves

Hans Bethe

Dottie McCann / Mrs. Griffin

Hank Kahler / Kennedy

Pap Finn / Buster McGuire

Lovely Mead / Wallace Kirkman

Mr. Tapping / Julian Hyde

Edward / The Narrator / The Mysterious Man

Robert Wilson

Frank Oppenheimer

Ernest Lawrence

Isidor Rabi