Bernard Rebel

as Kalador (uncredited)

as Prof. Eugene Dubois (uncredited)

as Prof. Leverrin

as Art Dealer

as Mr. Wheeler

as Bearded Client (uncredited)

as Italian Passenger (uncredited)

as Bearded Delegate (uncredited)

as Engraver

as Klacken

as Xenobian

as Doctor Bruno

as Stefan

as Vachek

as Quisling

as Vinson - Spy Henchman

as The Count

as Lebrun

as Trubiev