* CompleteMonster: Superboy-Prime begins his descent towards the trope here, killing multiple superheroes, and then blaming them for it, trying to kill Superboy so that he can take his place, trying to kill the entire universe so that he can have ''his'' world back, and finally [[spoiler:beats Kal-L to death]] with his bare hands. Some feel that he hit CM status here, others think that didn't happen until the ''Sinestro Corps War'' or even ''Legion of Three Worlds'', but either way, by the time the story ends he has crossed the MoralEventHorizon and is heading on down.
* MemeticMutation: "Superboy punched [=reality/time/a wall=]" became a popular way to describe {{Asspull}} {{Retcon}}s for a while.
* MoralEventHorizon: Alexander Luthor has crossed it from before the story started and just kept on going. Superboy Prime crosses it at the end by killing [[spoiler: Golden Age Superman]].
** Alex's concrete crossing was probably in the lead-in series ''Villains United'', when he [[spoiler: kills [[TheWoobie Pariah]]]].
* {{Squick}}: Prime [[spoiler:carving his own chest. Wouldn't be so bad, if he didn't look like he had ''rabies'' or something...]]
* TearJerker: The deaths of [[spoiler: BlueBeetle, [[TheGoldenAgeOfComicBooks Golden Age]] Lois Lane, Superboy, and [[TheGoldenAgeOfComicBooks Golden Age]] Superman]].
* UnfortunateImplications: You'll often hear claims that Phantom Lady's death smacked of misogyny, as she ends up ImpaledWithExtremePrejudice on a long, thin object... right between the breasts!
** Also counts as DoesThisRemindYouOfAnything.
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