Dr. Haverill is asked to fill in as local physician for the skittish Dr. Lennox in a small Pennsylvania town. The locals seem to be a superstitious bunch, prone to fearing traveling in the woods at night and with good reason. It seems a series of vicious attacks have occurred by what appears to be some kind of large animal. As the bodies begin to pile up, Dr. Haverill starts to question whether the responsible party could be something beyond humanity.