The Mad Monster is a 1942 American black and white horror film, produced and distributed by "Poverty Row" studio Producers Releasing Corporation. The film stars George Zucco, Glenn Strange, Johnny Downs, and Anne Nagel.

Plot

On a fog-bound moonlight night, a wolf howls in a swamp. In his nearby laboratory, Dr. Lorenzo Cameron draws blood from a caged wolf. Secured to a table is Dr. Cameron's simpleminded but strong gardener, Petro, who is to be the subject of the doctor's experiment. Cameron injects a serum made from a wolf's blood into the cooperative Petro, who loses consciousness, grows fur and fangs, and awakens after he has transformed into a wolfman.