Man Made Monster (1941)
Just caught this on Svengoolie and loved it. Lon Chaney Jr gives a great performance. It's one of those classic stories about a monster whose not really the bad guy so the ending is always tragic. It plays out pretty formulaic here but it's done well enough that it's definitely worth seeing. The pseudo science is silly fun plus Lon Chaney glows through half the movie what's not to like.