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?
| Actor | Role |
|---|---|
 Lex BarkerFBI Agent Joe Como | FBI Agent Joe Como |
 Karin DorLiane Martin | Liane Martin |
 Werner PetersMartin Droste, aka Bobo the Clown | Martin Droste, aka Bobo the Clown |
 Siegfried LowitzPolice Commissioner Brahm | Police Commissioner Brahm |
 Walo LüöndDetective Haase | Detective Haase |
 Wolfgang PreissDr. Krone / Dr. Mabuse | Dr. Krone / Dr. Mabuse |
 Kurd PieritzDr. Bardorf | Dr. Bardorf |
 Rudolf FernauProfessor Erasmus | Professor Erasmus |
| HHans Schwarz Jr.Henchman Max | Henchman Max |
 Walter BluhmTheater Watchman | Theater Watchman |
| AAlain DijonAgent Nick Prado | Agent Nick Prado |
| HHeinrich GiesOptiker | Optiker |
 Carl de VogtEmpfangschef | Empfangschef |
 Zeev BerlinskyMann im Leichenschauhaus | Mann im Leichenschauhaus |
 Gert Günther HoffmannFBI Agent Joe Como (German voice) | FBI Agent Joe Como (German voice) |
 Georg ThomallaKriminalbeamter Hase (voice) | Kriminalbeamter Hase (voice) |
 Harry WüstenhagenClown Bobo (voice) | Clown Bobo (voice) |