One of my favorite mad scientist movies is Dr. Cyclops. It was one of those films which didn't get over played on my local TV stations when I was a kid - seeing it was always a surprise and a treat. I haven't watched it in a long time. It would be nice to see it again. I think I could still enjoy all of those zany mad scientist shenanigans.
Henry Kuttner wrote the story "Dr, Cyclops" for the June 1940 issue of Thrilling Wonder Stories. The release date for the movie was April 1940. I wonder if the story was just an adaption of the movie for a promotional tie-in.