Lady Frankenstein (1971)

When Dr. Frankenstein is killed by a monster he created, his daughter and his lab assistant Marshall continue his experiments. The two fall in love and attempt to transplant Marshall's brain in to the muscular body of a retarded servant Stephen, in order to prolong the aging Marshall's life. Meanwhile, the first monster seeks revenge on the grave robbers who sold the body parts used in its creation to Dr. Frankenstein. Soon it comes after Marshall and the doctor's daughter.

Lady Frankenstein is a horror movie featuring Joseph Cotten and directed by Mel Welles.

Lady Frankenstein is currently streaming for free (ad-supported) on Cineverse, Plex, Plex Player, Public Domain Movies, Shout! Factory TV, The Film Detective and Tubi TV and it's also available on Cultpix, Fandor Amazon Channel, Night Flight Plus, Screambox and Screambox Amazon Channel.

It is also possible to buy Lady Frankenstein on Amazon Video and Vudu.