Read more about Mr. Mxyzptlk at: Wikipedia
Official Site: DC Comics
He was created by Jerry Siegel and Joe Shuster, and first appeared in Superman #30 (September 1944). He is usually presented as a trickster, in the classical mythological sense, in that he enjoys tormenting Superman. In most of his writings he can only be stopped by tricking him into saying or spelling his own name backwards which will return him to his home in the 5th dimension and keep him there for a minimum of 90 days. However this specific limitation of the character has been eliminated since the Crisis on Infinite Earths reboot, upon which the character only leaves because he willingly agrees to do so after meeting some conditions he sets, such as having Superman succeed in painting Mxy's face blue.
In 2009, Mr. Mxyzptlk was ranked as IGN's 76th Greatest Comic Book Villain of All Time.
"Mister Mxyzptlk" was introduced in the Golden Age as an imp from the "fifth dimension". Not being bound by our physical laws, he can do things that seem to be magical. In his first appearance, Mxyzptlk wreaks havoc across Metropolis by using his powers to pull all manner of pranks. What's more, he destroys Superman's worldview of himself. Mxyzptlk jumps out a window, fooling Superman into thinking Mxyzptlk is committing suicide. When he appears unharmed, an astonished Superman exclaims "I-I thought I was the only man who could fly!!" Mxyzptlk soon tells Superman that he is a jester in his home dimension, explaining why he uses his powers to play practical jokes.
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