The Mad Monster - Region 1 DVD

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.