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.
You can now watch The Testament of Dr. Mabuse online on the following streaming providers in the United States.
| Directing | Fritz Lang | Director |
| Writing | Fritz Lang | Screenplay |
| Writing | Thea von Harbou | Screenplay |
| Production | Seymour Nebenzal | Producer |
| Production | Fritz Lang | Producer |
| Sound | Hans Erdmann | Original Music Composer |
| Camera | Fritz Arno Wagner | Director of Photography |
| Editing | Conrad von Molo | Editor |
| Editing | Lothar Wolff | Editor |
| Writing | Norbert Jacques | Novel |
| Sound | Walter Sieber | Original Music Composer |
| Camera | Károly Vass | Director of Photography |
| Art | Emil Hasler | Art Direction |
| Art | Karl Vollbrecht | Art Direction |
| Costume & Make-Up | Hans Kothe | Costume Design |
| Costume & Make-Up | Franz Siebert | Makeup Artist |
| Sound | Adolf Jansen | Sound Designer |
| Sound | Conrad von Molo | Sound Editor |
