Mr. Mxyzptlk - An impish little man who lived in the fifth dimension and who was a constant irritation to Superman in the comics and on episodes of THE ADVENTURES OF SUPERBOY/SYN/1988-91. Lacking excitement in his own home world, Mr. M transported himself to the city of Metropolis where he wreaked mischievous havoc on its citizenry. The only one capable of getting the unwanted visitor out of town was Superman, an alien from the planet Krypton who now resided in Metropolis in the guise of Clark Kent, a reporter for the Daily Planet. If Superman could fool Mr. Mxyzptlk into saying his name "backwards," (KLTPZYXM) the bratty little alien would have to return to the fifth dimension for 90 days. Because he enjoyed being a pain in the butt, he wasn't about to volunteer the information, so it fell on Superman to get the job done and send Mr. "M" back to his homeland of ZRFFF and to his parents TLNDSA (father), and FUZASTL (mother). The strange land was ruled by King BPRXZ. Truly, these are names that only a cryptologist could love.