The Monster Maker (1944)

Mad scientist (as all scientists are in old movies) Dr Markov (J. Carrol Naish) is conducting crazed experiments on living creatures, he also likes a piano recital. While at such a recital by Lawrence (Ralph Morgan) he spies the pianist's daughter Patricia (Wanda McKay) who looks so much like his old wife he resolves to do everything he can to make her his, and that everything involves plenty of evil antics...

That includes injecting Lawrence with a disease that turns the pianist into a disfigured "monster". Dr Markov now blackmails Patricia to marry him in return for curing her father. That probably isn't the basis of a happy marriage to honest...

A typical low budget horror film including a man in a rather unconvincing gorilla suit. Although a bit silly it has some good acting turns and the central premise is appealingly twisted.