Mr. Hauen
Mr. Sandor
Professor Kent
Dr. Adolph Behrens
Dr. O'Meara
Geneva Man
Otto Kuhn
Jan Dorchik
Dr. Franken
Hotel Barkeeper (uncredited)
Dr. Klauber
Dr. Brenner
Herr Barthel
Raymond Poincaré
Klaus
Regisseur
Dr. Zinker
German Businessman (uncredited)
Stage Director
Zar