Entertaining mad scientist flick directed by Reginald Le Borg, notable for its cast of horror vets. Basil Rathbone plays the lead character, a surgeon whose beautiful young wife is suffering from a brain tumor. To save her he will need to operate but first he wants to get plenty of practice in on the unsuspecting locals. Rathbone's assistant, played by Herbert Rudley, has some objections. Bela Lugosi (not looking well) plays a mute servant in his last completed film role. A waste of his talents but at least this movie isn't as bad as his Ed Wood dreck. Lon Chaney, Jr. plays a lunatic brute, as he often did late in his career. Just like Bela, he has no lines. Also appearing are John Carradine, Akim Tamiroff, Tor Johnson, and Patricia Blair. No one in this has a good part except for Rathbone and Rudley. Still, it's a good B movie of the kind that was so prominent in the '30s and '40s but had died out by this point. Too bad they couldn't get Boris Karloff, though.