Superman's latest week has been so odd that he wonders if he's going crazy. Things seem to be happening that no one else can see, and mixed up in it is a strange little man. Then the Man of Steel discovers that the bizarre occurrences have been caused by a 5th-dimensional imp, Mr. Mxyzptlk, who unfortunately wants to play games with him. The only way to get rid of him is to force him to say/spell/etc. his name backwards, but this only works for 90 days at a time, and each time Mxy gets angrier and more determined to beat him. Can Superman get rid of this exasperating imp once and for all?
This episode contains examples of:
- All Myths Are True: Mxy claims to have inspired the stories about genies and leprechauns.
- Batman Gambit: Superman plays Mxy every time after the rules are set, especially in their last battle.
- DVD Commentary: Received a video commentary for the Volume 2 DVD set. On it, Paul Dini refers to this as his favorite episode.
- Great Gazoo: Mr. Mxyzptlk.
- Jerkass: Mxy.
- Ms. Fanservice: Gsptlsnz
- Mythology Gag: Mxy turns Jimmy into a turtle. In the comics, a growth ray combined with a turtle turned the hapless kid into a giant turtle boy.
- Lois confirms her sister Lucy is in this continuity.
- Mxy using his powers to make Streaky the cat fly.
- The strip "Mr. Mxyzptlk" is said to be written by Jerry Siegel and Joe Shuster, Mxy's creators (not to mention Superman's).
- No Indoor Voice: Mxy. What do you expect from Gilbert Gottfried?
- No Ontological Inertia: After Mxy is banished for good, everything returns to the point immediately before he starting turning the staff into animals.
- Noodle Incident: Mxy spends three months creating a giant robot to fight Superman. We never hear about what happens, but he pops back into the fifth dimension a few seconds after leaving.
- Obfuscating Stupidity: Superman pulls this on Mxy twice. First is when he claims not to know which one of them is supposed to say Mxy's name backwards. Second is when he makes several writing mistakes, getting Mxy to spell-check and mark off the necessary letters.
- Oh Crap: Mxy several times.
- Reality Warper: Mxy, unfortunately.
- Screw This, I'm Outta Here: After Mxy turns the staff into animals, Superman just gives up and leaves. That was part of his plan, though.
- Ugly Guy, Hot Wife: Mxyzptlk and Gsptlsnz.