|Base:||The Fifth Dimension|
Mister Mxyzptlk (pronounced "mix-yez-spit-lick") was an imp from the Land of Zrff in the Fifth Dimension.
Bored with living in the Fifth Dimension, Mr. Mxyzptlk started going to the Third Dimension where his powers were unrivaled. Using these powers he tormented humans, including mortal sorcerers such as Doctor Strange and Doctor Doom, and even gods. His mischief also brought the wrath of the Asgardian gods, in which he was banned from Asgard by Odin. However, Mxyzptlk is able to be send back to his dimension by having him uttering his name backwards, "Kltpzyxm" (Pronounced "Kill-tip-see-zim").
Working with LokiEdit
When Superman and his allies stopped the Annihilator and separated the Eye of Odin from it and kept it at the Fortress of Solitude, Loki allied with Mxyzptlk in threatening the lives of the X-Men and forcing Superman to giving up the Eye of Odin.
Mxyzptlk began annoying Alison Blaire, in which only she can see him, before being tricked in speaking his name backwards by Siryn - who was well knowledge about the imp's existence from her adopted father Doom. Mxyzptlk, however, only persists in harassing the other members of the X-Men by playing various pranks on them until being likewise tricked to saying his backward name - usually the students and staff members of the Xavier Institute play dumb.
In spite of the X-Men's constant victories, Mxyzptlk was provided a Norn Stone by Loki and used it to transport the Xavier Institute to the Fifth Dimension. Loki's plan almost worked, but ultimately to be defeated by the Justice League and his brethren Thor, Sif, and Balder. Odin soon arrived on the scene and Mxyzptlk was terrified of the god's appearance. Mxyzptlk attempt to escape back to the Fifth Dimension, but only to be struck by a thunderbolt from Odin. He is then returned to his world, but the power surge made by Odin's thunderbolt fried Mxyzptlk's 3-D/4-D Imaging Projector that had brought him to the Third Dimension and ensuring that the imp doesn't return. Mxyzptlk is shortly left to the mercy of his wrathful wife Mltzpkly for slacking away and ignoring her.