The Pit and the Pendulum
Vincent Price plays a 16th century Spanish nobleman who slowly goes crazy when he thinks that his wife has been buried alive. It's all a joint plot between the supposed dead wife and her doctor/lover to get Price's money. Price now totally insane, assumes his father's identity (that of a grand inquisitor) and starts to murder!
Starring
Vincent Price, John Kerr, Barbara Steele
Director
Roger Corman