as Prof. Ludwig Weiss
as Pieter Sluys
as Winkler
as Lhama
as Manager of Teatro La Fenice
as Professor Franz Menzel
as Joseph
as Prof. Pal Kudnic
as Dr. Murton
as Old Man on Train (uncredited)
as Prof. Leon Dushenko
as Scientist (uncredited)
as Vittorio Miranda
as Karl Kopek
as Otto
as Dirk Brak
as Flower Seller
as Prof. Gollner
as Papa Moreau
as President of the Medical Society (uncredited)
as Duval
