"Mister Mxyztplk" [məksɪtzpʌlk] (as his name was originally spelled, originally pronounced
mux-ITZ-pulk [məksɪtzpəlk] according to the title
Superman Family) was introduced as an
imp from the fifth dimension. Not being bound by our physical laws, he could do things that seemed to be magical. In his first appearance, Mxyztplk wreaked havoc across Metropolis by using his powers to pull all manner of pranks. What's more, he destroyed Superman's worldview of himself. Mxyztlpk jumped out a window, causing Superman to think Mxyztlpk was committing suicide. Mxyztplk was not. An astonished Superman exclaimed "I — I thought I was the only man who could fly!!". Mxyztplk soon told Superman that he was a
jester in his home dimension, explaining why he used his powers to play practical jokes.
Originally, Mxyzptlk had designs on conquering the planet for himself, but soon settled for tormenting Superman whenever he got the opportunity. His only weaknesses were that he could not stand being ridiculed and if he said or spelled his name backwards,
Kltpzyxm (kil-tip-zee-zim [kɪltɪpzizɪm]), he was involuntarily sent back to his home dimension for a minimum of 90 days. Mxyzptlk would often look for ways to counter the latter weakness, but he always proved gullible enough for Superman to trick him time and time again. In the Golden Age, saying "Kltpzyxm" would not only bring Mxy back to the fifth dimension, but would bring anyone else saying it to the fifth dimension. To return back to his/her home dimension, one had to say his/her name backward.
Mxyztplk appeared originally as a small bald man in a purple suit, green bow tie and purple
derby hat. This was changed to a futuristic looking orange outfit with purple trim in the mid-
1950s, although the hat remained. At around this time the spelling of Mxyztplk's name changed (by mistake) to "Mxyz
ptlk".
Superman himself decided to turn the tables and visit the 5th dimension, making trouble for the imp, who was running for mayor. When Myxzptlk furnished a huge supply of food for prospective voters, he said, "Eat up, folks, the food's on me!" Superman used super-breath to blow the food all over the imp and then chortled to the voters, "Like he said, folks--the food is on him!" The imp tried to get the Man of Steel to say "Namrepus," but that didn't work; Superman banished himself back to Earth by saying "Le-Lak"--his Kryptonian name backwards.