Lady Frankenstein.

Dr. Frankenstein is killed by his own monster. His daughter and his lab assistant Marshall continue his experiments. The two fall in love and 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.

This is another one of those psycho-horror italian films in the late 1960’s style. It had violence and nudity and is therefore Rated R.