Brian Dennehy

Gen. Leslie Groves

David Strathairn

J. Robert Oppenheimer

Michael Tucker

Leo Szilard

Hume Cronyn

James F. Byrnes

Richard Dysart

President Harry S. Truman

Hal Holbrook

Gen. George Marshall

Barnard Hughes

Henry Stimson

John McMartin

Dr. Arthur Compton

David Ogden Stiers

Franklin D. Roosevelt

Anne Twomey

Kitty Oppenheimer

Lawrence Dane

Ron Frazier

Colonel Pash