Thomas Alva Edison

Spencer Tracy

General Powell

Charles Coburn

Mary Stilwell

Rita Johnson

Bunt Cavatt

Lynne Overman

Mr. Taggart

Gene Lockhart

Ben Els

Henry Travers

Michael Simon

Felix Bressart

Ashton

Peter Godfrey

Galbreath

Frank Faylen

Lundstrom

Guy D'Ennery

Edwin Hall

Byron Foulger

'Acid' Graham

Milton Parsons

Dr. Johnson

Addison Richards

Bigelow

Arthur Aylesworth

Jimmy Price

Gene Reynolds

Shade

Grant Mitchell

Sheriff

Paul Hurst

Jordan

Don Douglas

Toastmaster

George Lessey

Bisbee

Harlan Briggs

John Schofield

Jay Ward

Clark

Charles Trowbridge

Nancy Grey

Ann Gillis

Blair

Harold Minjir

First Lecturer

Erville Alderson

Minister

George Meader

Minor Role

William Arnold

Workman

Milt Kibbee

First Commissioner

Charles Waldron

Broker

Hooper Atchley

Sheriff

Irving Bacon

Second Lecturer

Charles Lane

Broker

Arthur Belasco

Party Guest

Edward Biby

Broker

Edward Earle

Minor Role

Joe Whitehead

Reporter

Billy Bletcher

Secretary

Emmett Vogan

Preacher

Harry C. Bradley

Policeman

Tom Mahoney

Minor Role

Fritzi Brunette

Coachman

Bruce Mitchell

Mechanic

John Butler

Party Guest

James Carlisle

Woman

Nell Craig

Gold Exchange Clerk

George Chandler

Minor Role

Howard Chase

Party Guest

James Conaty

Waiter

Jimmy Conlin

Reporter

Nick Copeland

Broker

Maurice Costello

Lamplighter

George Ovey

Minor Role

Jack Daley

Policeman

Edgar Dearing

Cashier

Eddie Gribbon

Minor Role

Helen Dickson

Newsboy

Robert Winkler

Broker

John Dilson

Doctor

Edward J. LeSaint

Footman

Roy Cummings

Marion Estelle Edison

Eve Kendall

Man at Banquet

Walter Fenner

Thomas Edison Jr.

Michael Simms

Broker

Hale Hamilton

Butler

Alex Pollard

Party Guest

Sam Harris

Third Lecturer

Edward Keane

Broker

Edward Hearn

Broker

Arthur Stuart Hull

Broker

Harry Humphrey

Reporter

Cyril Ring

Reporter

Ralph McCullough

Broker

Wilfred Lucas

Party Guest

Eric Mayne

Broker

Louis Natheaux

Party Guest

Hans Moebus

Party Guest

Edmund Mortimer

Broker

Forbes Murray

Broker

Lloyd Whitlock

Party Guest

Alex Novinsky

Minor Role

Harry Strang

Waiter

William H. O'Brien

Minor Role

Billy Arnold

Minor Role

Thomas Pogue

Butler

Alexander Pollard

Party Guest

Count Stefenelli

Trailer Narrator (voice)

Frank Whitbeck