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