Abbott and Costello started with Frankenstein in 1948, and then proceeded to meet all the great monsters. In this film, the cowardly, hilarious duo team up with the King of Horror, Boris Karloff, as the misguided, evil Dr. Jekyll and his counterpart as the malicious, psychotic Mr. Hyde. This is the next best horror-comedy film for the duo after Frankenstein. It has wonderful sets, funny moments, and fantastic makeup as various individuals turn into Hyde-like beasts and Lou turns into a giant mouse. Karloff somehow remains his ever so serious self, amidst the slapstick humour. You can all most look in his eyes and see him thinking he is above this, but he turns in a very nice performance nonetheless.