History WesternAnimation / SonicUnderground

* CanonImmigrant: Knuckles's grandfather, Athair, was originally a character from the Archie ''Sonic'' comics.

* BadassMustache: Dr. Robotnik.

TheOneWith... Sonic's long-lost siblings, ThePowerOfRock, and the [[BreadEggsMilkSquick exploding baby hedgehog]].

* ExpositoryThemeTune: The theme song describes the show's premise and what the hedgehogs hope to accomplish.

* MechaMooks: SWAT Bots.

* MessyHair: Manic has it.

* MusicalAssassin: All three of the hedgehogs.

After ten years of being CutShort, it seemed that [[http://www.bumbleking.com/forum/viewtopic.php?f=4&t=6519&start=30 the story would conclude]] in the [[ComicBook/SonicTheHedgehogArchieComics Archie Sonic Comic's Sonic Universe]]. [[https://twitter.com/IanFlynnBKC/status/510281489292877824 Unfortunately, the project was cancelled.]] The Fan WebComic ''Webcomic/ArchieSonicOnline'' has however decided to give their own spin on this.

* ThemeTuneCameo: The main theme plays lots of times in the background, in different keys depending on the situation.

TheOneWith... Sonic's long-lost siblings, ThePowerOfRock, and the [[Memes/SonicTheHedgehog dead robot baby hedgehog]].

TheOneWith... Sonic's long-lost siblings, ThePowerOfRock, and the [[Memes/SonicTheHedgehog dead robot baby hedgehog].

TheOneWith Sonic's long-lost siblings and ThePowerOfRock.

* * A villainous version in the episode "Winner Fakes All". Robotnik sets up a race to crown "the fastest being on Mobius", knowing that [[FastestThingAlive Sonic]] will be unable to resist such a challenge. Sure enough, Sonic signs up for the race, ignoring the protests of his siblings... [[SubvertedTrope then changes his mind and pulls out at the last minute]].

* NoEnding: The show was cancelled before an ending could be written; the final episode doesn't resolve anything. The planned comic conclusion was also shelved.

After ten years of being CutShort, it seemed that [[http://www.bumbleking.com/forum/viewtopic.php?f=4&t=6519&start=30 the story would conclude]] in the [[ComicBook/ArchieComicsSonicTheHedgehog Archie Sonic Comic's Sonic Universe]]. [[https://twitter.com/IanFlynnBKC/status/510281489292877824 Unfortunately, the project was cancelled.]] The Fan WebComic ''Webcomic/ArchieSonicOnline'' has however decided to give their own spin on this.

* FullyAbsorbedFinale: The series' story was meant to get a conclusion through the ''[[ComicBook/SonicTheHedgehog Archie Sonic the Hedgehog]]'' comics, but it ended up being canceled.

* ThoseTwoBadGuys: Sleet and Dingo.

* DisappearedDad: No mention has ever been made of Aleena's husband/the siblings' father. Not even in the Mirror Universe. However, FanFiction and FanArt shows that his name might have been Jules. His purported appearance, however, varries -- some say his fur color was blue like his son Sonic's. Others say it was green like Manic's.

* AbsenteeFather: The identity of the King of Mobius -- Aleena's husband and the triplets' father -- remains a mystery, though FanFiction and FanArt shows that his name might have been Jules.

* DisappearedDad: No mention has ever been made of Aleena's husband/the siblings' father. Not even in the Mirror Universe.

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* LaserGuidedAmnesia: Happens to Sonia in one episode.

Not to be confused with the [[WesternAnimation/SonicSatAM three]] [[WesternAnimation/AdventuresOfSonicTheHedgehog other]] [[WesternAnimation/SonicBoom western]] [[WesternAnimation animated]] series based on Sonic the Hedgehog, the {{anime}} series ''Anime/SonicX,'' the {{OVA}} ''Anime/SonicTheHedgehogTheMovie'', the [[Film/SonicTheHedgehog2020 film adaptation]] or the game that helped to [[CutShort kill it off]] that same year, ''VideoGame/SonicAdventure''.

* MaliciousMisnaming: Like ''WesternAnimation/SonicSatAM'' and ''WesternAnimation/AdventuresOfSonicTheHedgehog'' before it, the show has Sonic constantly refer to Robotnik as "Robuttnik", and occasionally "Buttnik". The triplets occasionally get in on it as well.

** In the first episode, Uncle Chuck and Sonic are seen in the former's base from ''WesternAnimation/SonicSatAM''. When Robotnik is taking over, a statue of King Acorn (also from ''[=SatAM=]'') is seen crumbling.

* ScienceIsBad: Surprisingly downplayed. In this show, unlike in ''WesternAnimation/SonicSatAM'', Robotnik is much less of a polluting industrialist and mostly sees technology as a way to maintain his control over the planet. Therefore, there's much less of an incentive for him to pollute the entire planet purely for the sake of doing so. Granted, the places under his most secure control aren't paradise, but they're still livable, and it's heavily implied that the hedgehogs' secret home base is located in Robotnik's capital city. That, and Sonic and Company have used futuristic technologies (i.e. a RV van, a hover board, motorcycle, several other vehicles) constantly in their fight against Robotnik. Furthermore, there are several incredibly beautiful and highly futuristic cities on this version of Mobius.

** Thanks to the reuse of Mobius, roboticizing, and other aesthetics, ''Underground'' was likely intended to be one to ''WesternAnimation/SonicSatAM''.

* TotallyRadical: Sonic, as in [[WesternAnimation/AdventuresOfSonicTheHedgehog the previous]] [[WesternAnimation/SonicSatAM two shows]], but Manic also gets in on the act, using nonsensical adjectives like "crashin'" and "rippin'" as well as "bogus".

* UnwillingRoboticization: Similar to how it works in ''WesternAnimation/SonicSatAM'', with one major difference being that most of the time, beings that undergo roboticization come out looking like cyborgs and not full-fledged robots. However, the minds of roboticized beings are still enslaved to Robotnik and this control can only be broken temporarily. Robotnik used the roboticizer much more sparingly in this show, treating it more as a punishment for rebellion or failing to carry out his orders, rather than an umbrella treatment for all living creatures. Most people are not roboticized and Robotnik employs two unroboticized bounty hunters who are threatened several times with the treatment but are never actually subjected to it.

[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/Sonic_Underground_7556.jpg]]
[[caption-width-right:320:They made a vow - their mother will be found!]]

Not to be confused with the [[WesternAnimation/SonicSatAM three]] [[WesternAnimation/AdventuresOfSonicTheHedgehog other]] [[WesternAnimation/SonicBoom western]] [[WesternAnimation animated]] series based on Sonic the Hedgehog, the {{Anime}} series ''Anime/SonicX,'' the {{OVA}} ''Anime/SonicTheHedgehogTheMovie'', the [[Film/SonicTheHedgehog2020 film adaptation]] or the game that helped to [[CutShort kill it off]] that same year, ''VideoGame/SonicAdventure''.

* FourFingeredHands: Robotnik for reasons unexplained retains this from the previous shows save for an [[OffModel error or two in the animation]]. Averted otherwise, with even Sonic gaining a fifth finger.

* CanonForeigner: Besides most of the main characters, a notable example is Cyrus, a lion and member of the resistance movement.

* WhatAnIdiot:The Oracle tells Queen Aleena that her and her children will one day overthrow Robotnik.\\
'''You'd expect:'''That the Oracle will keep silent about it, only telling the queen and her children.\\
'''Instead:'''He gloats to Robotnik about the prophesy. Robotnik didn't even know there was a threat, and now has a reason to actually find the queen and her children.

Not to be confused with the [[WesternAnimation/SonicSatAM three]] [[WesternAnimation/AdventuresOfSonicTheHedgehog other]] [[WesternAnimation/SonicBoom western]] [[WesternAnimation animated]] series based on Sonic the Hedgehog, the {{Anime}} series ''Anime/SonicX,'' the {{OVA}} ''Anime/SonicTheHedgehogTheMovie'', the [[Film/SonicTheHedgehog2020 upcoming film adaptation]] or the game that helped to [[CutShort kill it off]] that same year, ''VideoGame/SonicAdventure''.