Arthur Edmund Carewe

as Professor Bowen

as Professor Omega

as Professor Darcy

as Dr. Rowitz

as Suave Man

as Dr. Louis Dumont

as Ivan Borolsky, aka Jim

as Capt. Spicer

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

as George Harris

as Lieutenant Destin

as Harry

as Major Anthony Kinsella

as Captain Herault

as Count Orloff

as Maurice Séquineau

as Salvatti

as Gigberto

as Prince Yussuf

as Ledoux

as Poulet

as Kenneth Bellwood

as Henri La Flamme

as Ramlika

as Israelite Slave (uncredited)

as Svengali

as Paul Savelli

as Prince Ferdinand

as Duke d'Alba

as 'Con' Arnold (as Arthur Carewe)

as Col. Fentress

as Grant Lewis

as Stinson

as Bolton (as Arthur Carewe)

as Heminway

as Christiansen

as The Rajah

as Prince Hagane (as Arthur Carewe)

as Don Jose Alvarado (as Arthur Carewe)

as Arthur Howison

as Archibald Loveday

as Count Alix Voronassof

as Wilbur Searles

as Joseph Rayberg / Baron Landsandhome

as Claude Estabrook

as Middy Knox