The Bride of Frankenstein

Mary Shelley reveals the main characters of her novel survived: Dr. Frankenstein, goaded by an even madder scientist, builds his monster a mate.
Dr. Frankenstein and his monster both turn out to be alive, not killed as previously believed. Dr. Frankenstein wants to get out of the evil experiment business, but when a mad scientist, Dr. Pretorius, kidnaps his wife, Dr. Frankenstein agrees to help him create a new creature.