Trilogy of Terror movie

Three horror anthology stories featuring Karen Black in four different roles playing tormented women. In the first story, Julie Eldridgex (Karen Black) is a sexually repressed high school teacher who is blackmailed by one of her students for a past indiscretions which she played an unwilling part. But the student is unaware that Julie plots to turn the tables on him the first chance she gets. In the second story, Millicent Larimore (Karen Black) is a plain-looking, almost reclusive woman whom lives with her amoral twin sister Therese (also Karen Black) whom delights in tormenting her. However, only their doctor whom visits from time to time knows the real thing behind the scene. In the final story, Amelia (Karen Black... again) in a solo horror story monologue plays a mother-dominated woman who buys an African Zuni fetish doll for her latest boyfriend in which the doll comes to life and terrorizes her in her own apartment.