 Editor's Note
 Dr. Cameron (George Zucco), a mad scientist who is put upon by his contemporaries who believe his ideas to be foolish, decides to exact revenge by creating a wolf-man. He injects wolf's blood into the veins of a slow-witted handyman named Petro (Glenn Strange), turning him into a man-beast with a taste for blood. Cameron releases Petro on his fellow scientist, with ghastly results.
 Plot Summary
 When a mad scientist turns a man into a werewolf, death and destruction quickly follow.| Dr. Cameron has been kicked off his university's faculty, and is out for revenge against the four former peers responsible for his dismissal. To accomplish this, he injects wolf blood into a peasant from the neighborhood, transforming the helpless man into a monster that goes out at night to kill. The doctor then orders his creation to slay the scientists who got rid of him.| As the bodies begin piling up, reporter Tom Gregory starts to piece together clues; soon, he's figured out what's going on. But can he stop Cameron and his fiendish beast?
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