Peter van Eyck
Henry B. Travers
Gert Fröbe
Detective Inspector Kras
Wolfgang Preiss
Prof. Jordan / Peter Cornelius / Dr. Mabuse
Dawn Addams
Marion Menil
Werner Peters
Hieronymus B. Mistelzweig
Andrea Checchi
Hotel Detective Berg
Howard Vernon
No. 12
David Cameron
Michael Parker
Christiane Maybach
Maid
Albert Bessler
Hotelingenieur
Marielouise Nagel
The Blonde Luck
Reinhard Kolldehoff
Roberto Menil aka 'Klumpfuß'
Nico Pepe
Hotel-Manager
Jean-Jacques Delbo
Cornelius' Butler
Linda Sini
Corinna
Renate Küster
TV announcer
Rolf Weih
Interpol-Chef
Rolf Moebius
Police-Officer
Maria Milde
Chambermaid
Dieter Hallervorden
Photojournalist (uncredited)
Bruno W. Pantel
Reporter (uncredited)
Wolfgang Völz
Barkeeper Karl (uncredited)
Werner Buttler
No. 11 (uncredited)
Hans W. Hamacher
BKA-Chef (uncredited)
Egon Vogel
Police doctor (uncredited)