Edison, O Mago da Luz

Spencer Tracy

Thomas A. Edison

Charles Coburn

General Powell

Lynne Overman

Bunt Cavatt

Rita Johnson

Mary Stilwell

Gene Lockhart

Mr. Taggart

Henry Travers

Ben Els

Felix Bressart

Michael Simon

Peter Godfrey

Ashton

Guy D'Ennery

Lundstrom

Byron Foulger

Edwin Hall

Milton Parsons

'Acid' Graham

Arthur Aylesworth

Bigelow

Gene Reynolds

Jimmy Price

Addison Richards

Mr. Johnson

Grant Mitchell

Snade

Paul Hurst

Sheriff