The arrival in a small mountain town of a dissheveled stranger launches a series of murders committed by some sort of animal. As the town doctor and his daughter attempt to help the stranger, the sheriff investigates the murders; and they uncover a sinister experiment involving two rogue scientists, a car accident victim, his wife and children, and a serum that causes a man to turn into a ravaging werewolf.

Steven Ritchas Duncan Marsh
Don Megowanas Sheriff Jack Haines
Joyce Holdenas Amy Standish
George Lynnas Dr. Morgan Chambers
S. John Launeras Dr. Emery Forrest
Harry Lauteras Deputy Ben Clovey
Kim Charneyas Chris Marsh
Don C. Harveyas Deputy (uncredited)