Professor Bowen
Professor Omega
Professor Darcy
Dr. Rowitz
Suave Man
Dr. Louis Dumont
Ivan Borolsky, aka Jim
Capt. Spicer
Dr. Fried (credits) / Dr. Beaudine (in film)
George Harris
Lieutenant Destin
Major Anthony Kinsella
Captain Herault
Count Orloff
Maurice Séquineau
Salvatti
Gigberto
Prince Yussuf
Kenneth Bellwood
Henri La Flamme
Ramlika
Israelite Slave (uncredited)
Svengali
Paul Savelli
Duke d'Alba
'Con' Arnold (as Arthur Carewe)
Col. Fentress
Grant Lewis
Stinson
Bolton (as Arthur Carewe)
Christiansen
Prince Hagane (as Arthur Carewe)
Don Jose Alvarado (as Arthur Carewe)
Count Alix Voronassof
Claude Estabrook
Middy Knox
