Mickey Rooney
Role: Thomas Alva 'Tom' Edison
George Bancroft
Role: Samuel 'Sam' Edison
Fay Bainter
Role: Mrs. Samuel 'Nancy' Edison
Virginia Weidler
Role: Tannie Edison
Eugene Pallette
Role: Mr. Nelson
Victor Kilian
Role: Mr. Dingle
Bobby Jordan
Role: Joe 'Joey' Dingle
Lloyd Corrigan
Role: Dr. Pender
John Kellogg
Role: Bill Edison
Clem Bevans
Role: Mr. Waddell
Eily Malyon
Role: Miss Lavina Howard, School Teacher
Harry Shannon
Role: Army Captain Brackett
Ernie Adams
Role: Passenger Buying Maple Sugar
Maude Allen
Role: Woman Fainting at Downed Bridge
Jessie Arnold
Role: Woman at Station
Polly Bailey
Role: Woman at Station
Sherwood Bailey
Role: Red, Joe's Friend
Jack Baxley
Role: Man at Dingle's Store
Arthur Belasco
Role: Telegrapher
Sammy Blum
Role: Train Passenger
Stanley Blystone
Role: Army Officer on Train
Wade Boteler
Role: Si Weaver
Eddy Chandler
Role: Mr. Briggs
Jack Daley
Role: Man at Station
Leigh De Lacey
Role: Train Passenger
John Webb Dillion
Role: Man at Station
Fern Emmett
Role: Mrs. McCarney
Budd Fine
Role: Train Passenger
Olin Howland
Role: Telegrapher (Indian Attack)
Philip Hurlic
Role: Black Boy at Tree
John Ince
Role: Man at Station
Mitchell Ingraham
Role: Man at Station
Milton Kibbee
Role: Baggage Man
Del Lawrence
Role: Train Passenger
Mitchell Lewis
Role: McGuire - Train Engineer
George Magrill
Role: Train Passenger
Wally Maher
Role: Man at Station
Claire McDowell
Role: Woman at Station
Frances Morris
Role: Woman at Station
Lee Phelps
Role: Train Engineer Miller
Victor Potel
Role: Mr. Tompkins
Mickey Rentschler
Role: Johnny, Joe's Friend
Marion Sheldon
Role: Train Passenger
Buster Slaven
Role: Boy at Tree
Marvin Stephens
Role: Frank Allen
Harry Strang
Role: Army Officer
Forrest Taylor
Role: Train Passenger
Spencer Tracy
Role: Man Admiring Portrait of Thomas A. Edison
Frank Whitbeck
Role: Narrator (voice)
Joe Whitehead
Role: Mr. Hodge
Al Thompson
Role: Man at Station
J.M. Kerrigan
Role: Mr. McCarney