Sam Waterston

Robert Oppenheimer

JO

John Carson

Narrator

Shane Rimmer

Ed Condon

Alexander Knox

Henry Stimson

Jana Shelden

Kitty Oppenheimer

Phil Brown

Lewis Strauss

Edward Hardwicke

Enrico Fermi

David Suchet

Edward Teller

James Maxwell

Lloyd Garrison

Milton Johns

George Kistiakowsky

Barry Dennen

Isidor Rabi

BO

Bob Sherman

Ernest Lawrence