Lex Barker
FBI Agent Joe Como
Karin Dor
Liane Martin
Werner Peters
Martin Droste, aka Bobo the Clown
Siegfried Lowitz
Police Commissioner Brahm
Walo Lüönd
Detective Haase
Wolfgang Preiss
Dr. Krone / Dr. Mabuse
Kurd Pieritz
Dr. Bardorf
Rudolf Fernau
Professor Erasmus
Hans Schwarz Jr.
Henchman Max
Walter Bluhm
Theater Watchman
Alain Dijon
Agent Nick Prado
Heinrich Gies
Optiker
Strange things happen in a revue theatre. The dancer Maria seems to be hunted by an invisible admirer. When the body of a probable FBI agent is found in a trunk the police asks FBI man Joe Como for help. Como gets interested in the revue theatre and an ominous transport firm soon. When he is receiving mysterious threatening letters he is sure that Dr. Mabuse has risen again. But what is going on at "Enterprise X" so that both the goverment and the mad genius in crime are interested in it?
