cast
- Spencer Tracy
- Thomas Alva Edison
- Rita Johnson
- Mary Stilwell
- Lynne Overman
- Bunt Cavatt
- Charles Coburn
- Gen. Powell
- 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 Ayleswofth
- Bigelow
- Gene Reynolds
- Jimmy Price
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- Addison Richards
- Dr. Johnson
- Harlan Briggs
- Bisbee
- Donald Douglas
- Jordan
- Emmett Vogan
- Secretary
- Grant Mitchell
- Shade
- Tom Mahoney
- Policeman
- Milt Kibbee
- Workman
- Charles Lane
- Lecturer
- George Meader
- Minister
- Joe Whitehead
- Man
- Frank Faylen
- Galbreath
- Charles Trowbridge
- Clark
- Nell Craig
- Woman
- Irving Bacon
- Sheriff
- Edward Earle
- Broker
- Harold Minjir
- Blair
- Bruce Mitchell
- Coachman
crew
- Clarence Brown
- Director
- John W. Considine, Jr.
- Producer
- Bradbury Foote
- Screenwriter
- Dore Schary
- Screenwriter
- Hugo Butler
- Screenwriter
- Talbot Jennings
- Screenwriter
- Harold Hal Rosson
- Cinematographer
- Herbert Stothart
- Composer (Music Score)
- Frederick Y. Smith
- Editor
- Cedric Gibbons
- Art Director
- Edwin B. Willis
- Art Director, Set Designer
- John S. Detlie
- Art Director
- Orville O. Dull
- Associate Producer
- Dolly Tree
- Costume Designer
- Gile Steele
- Costume Designer
- Robert A. Golden
- First Assistant Director
- Edison Institute
- Consultant/advisor
- Norman R. Speiden
- Consultant/advisor
- William A. Simonds
- Consultant/advisor
- Jack Dawn
- Makeup
