Mister Mxyzptlk is a fictional male in the Justice League comic series who was portrayed on screen by -. He is a mischievous imp from a Parallel universe who appears every so often to cause problems for Clark Kent/Superman.
The only way in which he can be defeated is by being tricked into saying his name backwards. He hasn't appeared in any of the films yet, although he has appeared in the cartoons and the nineties version of Superman with Dean Cain.
Copyright: DC Comics
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