Mister Mxyzptlk was one of the supervillains that attacked Metropolis when Batman visited for the first time in a while. Superman quickly gets rid of him by getting the imp to say Kltpzyxm as part of a knock-knock joke.



Superman Villain(s)
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This character is or was primarily an enemy of Superman in any of his various incarnations, or members of the Superman Family. This template will categorize articles that include it into the "Superman Villains category."