Arnold Marlé

as Old Man on Train (uncredited)

as Dr. Murton

(1 episode) as Duval

as Prof. Ludwig Weiss

as Winkler

as Lhama

as Scientist (uncredited)

as Prof. Leon Dushenko

as Karl Kopek

as Papa Moreau

as Prof. Pal Kudnic

as Vittorio Miranda

as Otto

as Manager of Teatro La Fenice

as Professor Franz Menzel

as Joseph

as Prof. Gollner

as President of the Medical Society (uncredited)

as Pieter Sluys

as Dirk Brak