Pierre Luigi - Photographer
Prof. Gruber
Lochner
Dr. Schwatzbacher
Rossi
Walter Vogel
Customer
George II
Hugo Bergmann
Brunet
Schroeder
Mr. Krohn
Schlip
Hendricks
Dr. Hans Tautz
Herman
Herr Schindler (uncredited)
Professor Topolski
Doctor Novotny
Schmidt
Professor Hansen
Dr. Odenheim
Dr. Fergus
Brodcynsky
Head Waiter
Carlo Penezzi
Papa
Mario - Waiter at the Savoy
Man with Microscope
Morgue Keeper
Dr. Schrott
Leon Stoltz
Dr. Rosen
Tony - Cafe Proprietor
Kublai Khan
Bandleader at Alligator Rally (uncredited)
Professor
Ambrose Solto
Police Chief (uncredited)
Watchmaker / Number Fifty Four
Prof. Yuri Dutrov
Astolat
Mr. Justin
Jerome