Bernard Rebel

as Prof. Eugene Dubois (uncredited)

as Art Dealer

as Bearded Client (uncredited)

as Vachek

as Kalador (uncredited)

as Vinson - Spy Henchman

as Bearded Delegate (uncredited)

as Stefan

as Engraver

as The Count

as Mr. Wheeler

as Trubiev

as Lebrun

as Xenobian

as Doctor Bruno

as Prof. Leverrin

as Quisling

as Italian Passenger (uncredited)

as Klacken

as Bishop