On April 17th at 8 PM EST, Turner Classic Movies (TCM) will be airing this movie. Here is a plot description:
The Mysterious House of Dr. C. (1976) is a rarely seen, reworked version of the 1966 Dr. Coppelius, a dance film based on the classic 19th-century Leo Delibes ballet "Coppelia
The plotline is developed from two macabre stories by E.T.A. Hoffman of The Tales of Hoffman fame, Der Sandmann (The Sandman) and Die Puppe (The Doll). It concerns a scientist who creates Coppelia, a mechanical doll so beautiful and lifelike that both he and Franz, a swain from the local village, become infatuated with her. Swanhilda, Franz's jealous bride-to-be, poses as the doll, convincing the scientist that he is a great wizard who has given his creation the gift of life.
Following the movie is the Tales from Hoffman film.