as Ledoux

as Dr. Rowitz

as Israelite Slave (uncredited)

as Professor Darcy

as 'Con' Arnold (as Arthur Carewe)

as Professor Bowen

as Bolton (as Arthur Carewe)

as Don Jose Alvarado (as Arthur Carewe)

as Kenneth Bellwood

as Stinson

as Henri La Flamme

as Salvatti

as Col. Fentress

as Christiansen

as Major Anthony Kinsella

as Suave Man

as Ivan Borolsky, aka Jim

as Dr. Louis Dumont

as Dr. Fried (credits) / Dr. Beaudine (in film)

as Capt. Spicer

as Count Orloff

as Count Alix Voronassof

as Harry

as Gigberto

as Professor Omega

as Prince Yussuf

as Ramlika

as Duke d'Alba

as Middy Knox

as Lieutenant Destin

as George Harris

as Prince Hagane (as Arthur Carewe)

as Captain Herault

as Paul Savelli

as Grant Lewis

as Svengali

as Claude Estabrook

as Maurice Séquineau

as Poulet