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