* ActorAllusion:
** Creator/DaveWittenberg's character, Ferro Lad, at one point tells Lightning Lad that [[Manga/{{Naruto}} he doesn't want to see what's under his mask]].
** Dorian Harewood, who voices Dr. Londo in Season 2, also voiced another [[Anime/AstroBoy doctor who had issues with his son]]. Unfortunately, this one had much less of a "happy ending" vibe to it.
* ExecutiveMeddling: The reason Saturn Girl didn't make as many appearances in Season 2 was because the crew was told to make the cartoon appeal more to boys.
* HeyItsThatVoice
** Harry Lennix ([[Film/TheMatrix Commander Jason Lock]]) is [[InkSuitActor Dr. Mar Londo]], in ep.1x02 ("Timber Wolf").
*** In Season 2, he's played by Dorian Harewood ([[Anime/AstroBoy Dr. Tenma]], [[WesternAnimation/TheBatman Martian Manhunter]]).
** Creator/YuriLowenthal is Superman, Superman X, and Stone Boy.
** Creator/DaveWittenberg is Ferro Lad and Grullug.
** David Lodge ([[Manga/{{Naruto}} Jiraiya]], [[Manga/{{Bleach}} Kenpachi Zaraki]]) is Tharok and the Controller.
** Shawn Harrison ([[Series/FamilyMatters Waldo Geraldo Faldo]]) is Timber Wolf.
** Creator/WilWheaton is Cosmic Boy and Roderick Doyle.
** Creator/CoreyBurton is [[WesternAnimation/SupermanTheAnimatedSeries once]] [[RoleReprisal again]]] Brainiac 1.0.
** Creator/KariWahlgren is Saturn Girl, Triplicate Girl/Duo Damsel, Shrinking Violet, Infectious Lass, and Ayla Ranzz.
** Creator/JenniferHale is Emerald Empress (her original voice actress) and Martha Kent.
** Creator/TaraStrong is Alexis, Esper and Emerald Empress's [[TheOtherDarrin other voice actress]].
** Creator/JamesArnoldTaylor is Lightning Lord, Color Kid, and Porcupine Pete.
** Creator/LexLang is R.J. Brande and Grimbor the Chainsman.
** Phil Morris ([[WesternAnimation/JusticeLeague Vandal]] [[WesternAnimation/JusticeLeagueDoom Savage]], [[WesternAnimation/TheSecretSaturdays Doc Saturday]]) is Imperiex.
** Heather Hogan ([[VideoGame/TalesOfSymphonia Colette]], [[VideoGame/TheWorldEndsWithYou Shiki]], [[VideoGame/SoulSeries Amy Sorel]]) is Phantom Girl.
** Shab Shimono ([[WesternAnimation/JackieChanAdventures Uncle]]) is [=K3NT=]'s male personality.
** Creator/LaurenTom is Zyx and White Witch.
** Khary Payton ([[WesternAnimation/TeenTitans Cyborg]]) is Tyr.
** Keith Ferguson ([[Franchise/KingdomHearts Marluxia]]) is Karate Kid and Nemesis Kid.
** Bumper Robinson ([[WesternAnimation/TransformersAnimated Bumblebee]]) is Star Boy and Ontir.
** Richard [=McGonagle=] ([[WesternAnimation/StarWarsCloneWars General Grievous]], [[VideoGame/XMenLegends Apocalypse]]) is the Higher Elder.
** Creator/DavidSobolov is Persuader.
** Creator/TaraPlatt is Dream Girl.
** Alexander Polinsky ([[WesternAnimation/TeenTitans Control Freak]]) is Chameleon Boy.
* TheOtherDarrin: As mentioned above, both Emerald Empress and Dr. Londo have their voice actors changed in Season 2.
* RecursiveAdaptation: The tie-in comic, ''Legion of Super Heroes in the 31st Century'', though it [[http://www.worldsfinestonline.com/WF/losh/guides/comic/09.jpg features]] [[http://www.worldsfinestonline.com/WF/losh/guides/comic/11.jpg designs]] for characters who didn't appear in the show that were closer to the Franchise/{{DCAU}}, including ComicBook/{{Brainiac}} (who appeared in Season 2 with [[http://www.worldsfinestonline.com/WF/losh/episodes/2526darkvictory/02.jpg a far different design]]) and ComicBook/MartianManhunter.
* TalkingToHimself: Creator/YuriLowenthal plays Superman and Superman X.
* WhatCouldHaveBeen
** This series was originally pitched as part of the Franchise/{{DCAU}}, with ''WesternAnimation/JusticeLeague Unlimited's'' late series episode "Far From Home" as a PoorlyDisguisedPilot.
** There was to have been a third season. And it was to have been awesome.
** Also, Mon-El was supposed to be in the line-up for Season 2. Instead we got [[CanonForeigner Superman X]].
** James Tucker had plans to make Alexis Luthor into TheDragon for Imperiex in season two. She would have later made a HeelFaceTurn (out of personal selfishness, of course) and betrayed him, gaining the galaxy's trust and running for a political position. Due to ExecutiveMeddling, however, they had to reduce the number of female characters for most of the season, and the subplot was cut.
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