After a detective is assaulted by thugs and placed in an asylum run by Professor Baum, he observes the professor's preoccupation with another patient, the criminal genius Dr. Mabuse the hypnotist. When Mabuse's notes are found to be connected with a rash of recent crimes, Commissioner Lohmann must determine how Mabuse is communicating with the criminals, despite conflicting reports on the doctor's whereabouts, and capture him for good.
Elenco: Rudolf Klein-Rogge , Oscar Beregi Sr. , Paul Bernd , Henry Pleß , Otto Wernicke , Paul Henckels , Theo Lingen , Rudolf Schündler , Camilla Spira , Hans Salcher , Theodor Loos , Hadrian Maria Netto , Adolf E. Licho , Wera Liessem , Karl Meixner , Gustav Diessl , Gerhard Bienert , Josef Dahmen , Georg John , Karl Platen , Paul Rehkopf , Franz Stein , Ludwig Stössel , Eduard Wesener , Bruno Ziener , Heinrich Gotho , Michael von Newlinsky , Anna Goltz , Heinrich Gretler , Klaus Pohl .