Heinz von Cleve

as Dr. Seward

as Obrist

as Harrison Howell

as Richter

as Major von Meszaros

as Pferdezüchter von Tweel

as Wienhold, Kriminalkommissar

as Saganoff

as Redakteur Hofstetten

as Konstrukteur Dr. Fleischer

as Eberhard von Waltzien

as Prinz von Gottorp Vetter der Zarin

as Stallbursche Geza von Rakos

as Roland de Saint Cour

as Kapitän Rist, Militärattaché

as Prinzgemahl Albert

as Butler Eric