Kalat says this was the sixth Mabuse movie, a combination sequel and remake. It has some typical sequel behavior, taking its villain backstory too far by explaining that brain abnormalities cause his evil power. Other than this, it’s a pretty good movie, much better than the 60’s Fantômas update.
Inspector Gert Fröbe (fresh off Fritz Lang’s own 1960 Mabuse movie) knows only one criminal mind could be behind a counterfeiting ring, but Mabuse (Wolfgang Preiss, also from the Lang) is secured in an asylum, so he visits the place and discovers that a doctor (the prolific Walter Rilla, who started out with Murnau’s Finances of the Grand Duke) is being hypnotized into passing along the mastermind’s messages. Corrupt cop Flocke tries to atone by getting into Mabuse’s gang, but is killed… Boxer Johnny joins the gang then finds he and his girl are trapped… the doctor apparently survives to appear in the next two movies.
Harmless Mabuse scribbles away while Gert reviews his notes and the bowtie doctor observes:
Mind-controlled doctor takes a drive: