Psychiatrist who studies Mabuse's writings and becomes possessed by his criminal genius.
John is Giorgi's musician uncle, whom Giorgi locates through Helen's work recording folk music. Giorgi moves into his house, and John later accompanies him to Southern California, encouraging his journey to find Helen. Though gravely ill, John becomes an American citizen before he dies.
Lord Purdon is John's fast friend and understands the blackmailers' character. To expose their scheme, he separately invites the plotters to the Humphries home for a supposed private interview and promises a monetary settlement. His plan brings the gang together, allowing the police to recognize and arrest them.
Oscar Beregi Sr. has 28 screen credits in a career dating back to 1917. Their work is anchored in the Dr. Mabuse Collection universe with 1 titles. Signature works include The Testament of Dr. Mabuse, Jewels, Die Jugend am Scheideweg. Explore the interactive character relationship maps on each title page to trace how their roles connect across franchises.
Related entry on Wikidata (Q338756), public domain (CC0).
