Scream Blacula Scream (1973)

After an aging voodoo priestess dies, her arrogant son, Willis Daniels, believes he is next in line to lead her cult. He is outraged when Lisa Fortier, his mother's adopted apprentice and stepsister, is chosen as the cult's leader. Willis seeks revenge by reviving the vampire African prince Blacula, but soon finds, much to his horror, that he cannot control him.