* AlternativeCharacterInterpretation: Superman gives up his powers when he is forced to kill Mr. Mxyzptlk. This is either his noblest act... or his most selfish. See the [[Analysis/WhateverHappenedToTheManOfTomorrow Analysis page]] for why.
* AntiClimaxBoss: The story seems to be building towards a major confrontation between Superman and Brainiac, but Brainiac is ultimately defeated by Lana, whose MercyKill of Lex [[PuppeteerParasite robbed Brainiac of a viable host]]. Instead of a great battle, Brainiac simply breaks down at Supermanís feet. Superman's true greatest threat is [[spoiler:evil!Mxyzsptlk]].
* CompleteMonster: ComicBook/{{Brainiac}}. He brainjacks Luthor in the most horrifying way possible, murders most of Superman's remaining friends, and is completely devoid of anything resembling a conscience.
* ContinuityLockout: Shades of this, since it references Superman's history, both famed and obscure. However, that's the entire point of the two-parter, to briefly touch on the Superman mythos. Do you ''really'' have to have read the Jimmy Olson book in which he became Elastic Lad to enjoy the story?
* EvilIsCool: Despite appearing in a few panels, Moore's revision of Mr. Mxyzsptlk, has remained an iconic rendition of that character. Post-Crisis authors increasingly nerf him because Moore demonstrated quite successfully that the Fifth-Dimensional being is capable of being Superman's worst enemy.
* HarsherInHindsight: The Prankster and Toyman were re-imagined as psychopaths in the Post-Crisis universe.
* HilariousInHindsight:
** Jordan Elliot looks like [[Comicbook/{{Watchmen}} the Comedian.]]
** Even more hilarious, the [[https://pbs.twimg.com/media/Cl7HKSTXIAIaEuZ.jpg original printing]] had a "Who Watches The Watchman" blurb in the area reserved for the barcode. Considering the events of ''ComicBook/DCRebirth'' and the post-Crisis Superman...
* OneSceneWonder: Mr. Mxyzsptlk appears in one-scene, and less than ten panels, but to say he steals the scene is an understatement.
* {{Narm}}: Batman and Robin attacking Brainiac's energy shield with sticks.
* TheyWastedAPerfectlyGoodCharacter: Lex Luthor, Superman's greatest ArchEnemy, the greatest criminal mind of our time, is reduced to a meat puppet in his final (Silver Age) appearance. THAT'S how Lex Luthor goes out.
----