Nikola Tesla
Anne Morgan
George Westinghouse
Thomas Edison
J.P. Morgan
Robert Underwood Johnson
Anital Szigeti
Katherine Johnson
Bourke Cochran
Charles Peck
Mina Edison
Nichols
William Kemmler
Francis Upton
Professor Anthony
Roller Skating Fiddler
Fred Ott
John Kruesi
Ed the Organist
Tesla's Mother
Bill Edison
Tom Edison Jr.
Dot Edison
Alfred Brown
Evelyn
Man Comforting Dog
Harold P. Brown
Tracy Becker
The Grande Dame
Young Anne Morgan
Agnes Johnson
Warden Durston
Prison Doctor
Westinghouse Assistant
Waiter
Sarah Bernhardt
Swami Vivekananda
Fritz Lowenstein
Alta Vista Waiter
Richard Gregg
Alta Vista Concierge
Alta Vista Violinist
J.P. Morgan's Assistant
Science Society President (uncredited)
Science Society Dignitary (uncredited)
Macak