Maj. Gen. Leslie R. Groves

Brian Donlevy

Acting

Col. Jeff Nixon

Robert Walker

Acting

Matt Cochran

Tom Drake

Acting

Anne Cochran

Beverly Tyler

Acting

Dr. J. Robert Oppenheimer

Hume Cronyn

Acting

Jean O'Leary

Audrey Totter

Acting

Dr. John Wyatt

Hurd Hatfield

Acting

Dr. Enrico Fermi

Joseph Calleia

Acting

President Franklin D. Roosevelt

Godfrey Tearle

Acting

Dr. Marre

Victor Francen

Acting

Dr. Chisholm

Richard Haydn

Acting

Dr. Vannevar Bush

Jonathan Hale

Acting

K.T. Keller

John Litel

Acting

Gen. Thomas F. Farrell

Henry O'Neill

Acting

Capt. William S. Parsons

Warner Anderson

Acting

Waitress

Ellen Ross

Acting

Radioman on Tinian Receiving A-Bomb Message

Bobby Jordan

Acting

Nazi Officer

Jerry Schumacher

Acting