To Abbott and Costello, to their latest movies before "Meet The Mummy", they have a big monster problem that's even worse. After being fired by the police department in London, they run into a strange case until they met Dr. Jekyll and Mr. Hyde played by Boris Karloff!! In the case chasing, they try to bring Mr. Edward Hyde to justice, until they are being fooled when they find Dr. Jekyll instead. Lou could be sure about that, but Bud is crossed about the way they think they did.
As they searched in Dr. Jekyll's lab, Lou was injected by a formula which he had the head and paws of a mouse!! The bartender and two customers were being nuts and frightened when they saw his head. Even a small little mouse. At last finally, he was back to his normal self.
As this case would go on, who knows what they might get into. Hyde formula?