Dr. Fletcher runs a mental institution for women. When an inmate gets out of line, she takes them down below to perform horrible experiments on them. Though "on the record" she defends it by saying that they'll be able to achieve scientific breakthroughs that can help mankind, her true purpose is to receive sexual satisfaction from it; a fact that she doesn't deny when brought up by her reluctant assistant. All girls who she experiments on die and then become zombified. Dr. Fletcher, herself, succumbs to this fate in the film's climax when her undead victims get their revenge.