Brian Donlevy

Maj. Gen. Leslie R. Groves

Robert Walker

Col. Jeff Nixon

Tom Drake

Matt Cochran

Beverly Tyler

Anne Cochran

Hume Cronyn

Dr. J. Robert Oppenheimer

Audrey Totter

Jean O'Leary

Hurd Hatfield

Dr. John Wyatt

Joseph Calleia

Dr. Enrico Fermi

Godfrey Tearle

President Franklin D. Roosevelt