Abbott & Costello play Slim & Tubby, two American policemen in London in order to study their local police tactics. They get a big chance when a series of murders break out with respected doctors being the victims. It turns out to be the work of Henry Jekyll(played nicely by Boris Karloff) who is frustrated and vengeful against the men who laughed at his research and theories. He developed the serum that turned him into Mr. Hyde, who is more athletic and stronger than Jekyll. Hyde becomes the object of a manhunt, with the expected comedic results. Despite the decline in quality of their films, this is an unexpected bright spot, being both funny and scary, and directed with energy and enthusiasm. I agree it would have been better if Karloff had the chance to do an entirely serious adaptation of the Robert Louis Stevenson novel, but this will have to do!
