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

Christiane Maybach

Maid

Albert Bessler

Hotelingenieur

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

Dieter Hallervorden

Photojournalist (uncredited)

Bruno W. Pantel

Reporter (uncredited)

Wolfgang Völz

Barkeeper Karl (uncredited)