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[[folder:Games]]
* AscendedMeme: On [[http://blogs.sega.com/2012/09/05/fast-cars-and-fast-hogs-now-on-sale/ their official website]], Sega used the "Gotta go fast!" meme in an announcement about Sonic 4: Episode 2 being on sale.
* BreakthroughHit: It was the first ''VideoGame/SonicTheHedgehog'' that put Creator/{{Sega}} on the map as a gaming company and SonicTeam as a premier development team.
* CashCowFranchise: Even after Sega got out of the console business, it's still Sega's PREMIER Franchise!
* CrossDressingVoices:
** Sonic has actually been voiced by at least three women -- Keiko Utoku in ''VideoGame/SonicCD'', Keiko Toda in the Japanese dub of ''Sonic Underground'', and Meg Inglima in ''SonicsSchoolhouse''.
** Tails used to be voiced by young boys, but since ''Anime/SonicX'', he has been voiced by women. In the Japanese versions, he has been voiced by one single woman since ''VideoGame/SonicHeroes'' and ''Sonic X''.
* CreatorBacklash: Mild, but Yuji Naka said that he feels the more recent Sonic games aren't as fun as the older ones, his main complaint being that [[ItsEasyNowItSucks they're too easy.]]
** Sega has deliberately been pulling recent Sonic titles with a below average metacritic score out of circulation [[AuthorsSavingThrow in an attempt by them to improve Sonic's quality image.]] And for [[ObviousBeta obvious]] [[ChristmasRushed reasons]], they're not too fond of Sonic 2006 and the [[NeverLiveItDown black mark PR damage]] it gave them, even firing its writers after the game was released and apologizing for its multiple issues. Despite including (refined) elements of it in the series MilestoneCelebration, SonicGenerations, Sega was [[SelfDeprecation modest enough to joke about its mixed reputation in one ad]]; while it was very impartial to the previous Sonic games it celebrated, once it got to Sonic the Hedgehog (2006), the music stopped and Sonic got an angry look on his face.
** On the subject of the newer games, the new development staff of Sonic Team admitted in Magazine/NintendoPower in a preview feature on Sonic Colors that the were-hog elements of Sonic Unleashed and the swordplay of Sonic and the Black Knight were not good ideas; and based Colors largely around the well-received day stages of the former.
** Yuji Naka and Takashi Iizuka have both publicly apologized for the [[GuideDangIt infamous]] [[FanNickname Barrel of Doom]] from "Carnival Night Zone" in SonicTheHedgehog3, as seen [[http://m.youtube.com/watch?v=3XeBgeN5uG8 here.]]
** Sonic Team openly despised the early [[AmericanKirbyIsHardcore American "Mohawk quill" redesign]] of Sonic featured in box and promo art, even seeing it as redundant because Sonic was designed to appeal to western audiences in the first place, and only relented when they felt that it and other Americanized changes to the series did help Sonic get off the ground in the long run, and it became a moot point when the redesign was retired in artwork in favor of the original japan design by the mid 90s.
* DuelingGames: The first game with ''VideoGame/SuperMarioWorld'', a launch title for Creator/{{Nintendo}}'s answer to the Genesis, the SuperNES.
* FanNickname: Several over the past two decades, but the most recent and most amusing nickname Sonic has been referred is "Generic Sonic", as his current design is referred to in the coding for the ''Generations'' demo.
* GeniusBonus: Planet Mobius was named for the Möbius strip, a reference to the loop-de-loops founds in the original ''Sonic'' game and its sequels. Neat, eh?
* HeyItsThatVoice:
** Sonic: [[FamilyMatters Jaleel White]] (Steve Urkel) in the American animated shows (''[[WesternAnimation/AdventuresOfSonicTheHedgehog AoStH]]'', ''WesternAnimation/SonicSatAM'' and ''SonicUnderground'').
*** Japanese-wise, the game ''[=SegaSonic=] the Hedgehog'' (A.K.A. ''Sonic Arcade'') featured [[Creator/TakeshiKusao Takeshi]] "[[DragonBall Trunks]]" [[Creator/TakeshiKusao Kusao]] as Sonic.
*** And now as of VideoGame/SonicColors/Colours and SonicFreeRiders he is voiced by RogerCraigSmith ([[Franchise/ResidentEvil Chris Redfield]], [[Franchise/AssassinsCreed Ezio Auditore da Firenze]], [[Anime/{{Naruto}} Deidara]], [[Anime/{{Bleach}} Shinji Hirako]], [[WesternAnimation/AvengersAssemble Captain America]], and [[VideoGame/BatmanArkhamOrigins Batman]]).
*** For [[Film/MegaMan Eddie Lebron's]] [[http://sonicfanfilm.com/ upcoming fan-film]], Jaleel White WILL reprise his role as Sonic.
** Knuckles: Creator/DanGreen, better known for his work in ''Anime/YuGiOh''.
*** Or for the Japanese, it's Creator/NobutoshiCanna.
*** His new English voice actor '''[[TravisWillingham LOVES]]''' [[Manga/FullMetalAlchemist DOGS]]!
** Amy: Went from [[Creator/LisaOrtiz Serenity]] [[Anime/YuGiOh Wheeler]] to [[Creator/CindyRobinson Makoto]] [[VideoGame/BlazBlue Nanaya]].
** Blaze[=/=]Maria: She used to be [[Anime/OnePiece Luffy]] (the [[FourKidsEntertainment 4Kids]] [[TheOtherDarrin one]]), [[DullSurprise but that]] didn't work [[CutAndPasteTranslation out for her]].
*** Now she's currently voiced by LauraBailey, known (among other roles) for Lust from ''Manga/FullmetalAlchemist''.
** Chip: Tony Salerno who voices Chazz Princeton in ''Anime/YuGiOhGX''.
** Dr. Eggman: Robotnik has been voiced by blues singer Long John Baldry (in ''[=AoSTH=]''), veteran voice actor JimCummings (in ''[=SatAM=]'' and the unaired pilot of ''[=AoSTH=]''), Creator/GaryChalk ([[HeyItsThatVoice the voice of]] [[TransformersArmada Opti]][[TransformersEnergon mus]] [[TransformersCybertron Prime]] and [[WesternAnimation/BeastWars Optimus]] [[BeastMachines Primal]], and who voiced Grounder in ''[=AoSTH=]''), MikePollock (''SonicX'' and all games starting from ''Shadow''), and Creator/ChikaoOhtsuka (in the Japanese dub).
** Rouge: Her [[LaniMinella original voice]] was [[VideoGame/ProfessorLayton Luke Triton]] and also [[VideoGame/SuperSmashBros voices]] [[VideoGame/KidIcarus Pit]] and [[VideoGame/{{Mother 3}} Lucas]], as well as [[VideoGame/NewSuperMarioBrosWii four of the Koopalings]]!
*** And now she's voiced by the appropriately {{Stripperific}} character [[GunXSword Fasalina.]]
** Big the Cat: He was originally voiced by VideoGame/DukeNukem. Now he's voiced by [[Anime/TengenToppaGurrenLagann Kamina]]. Shades-wearing badasses are apparently in his blood.
** E-123 Omega is now voiced by [[Manga/FullMetalAlchemist Edward]] [[VicMignogna Elric.]]
** Silver is now voiced by Creator/QuintonFlynn, otherwise known as [[Franchise/KingdomHearts Axel]] or [[Franchise/MetalGear Raiden]].
*** In the Japanese version he shares a voice with [[LightNovel/{{Durarara}} Shizuo]] [[Creator/DaisukeOno Heiwajima]], as well as [[Manga/BlackButler Sebastian Michaelis]]
** As of 2010, Wave now shares the same Japanese and English voice as Sakura Haruno.
* KeepCirculatingTheTapes: The bulk of the original games have seen a rerelease in some form, but there are a handful of titles that haven't and probably won't get ports anytime soon, including KnucklesChaotix and the arcade game SegaSonicTheHedgehog.
* MidDevelopmentGenreShift: The initial concept was a more traditional platformer with puzzles and exploration akin to ''VideoGame/SuperMarioBros2''. The final product, while still a platformer, focused more dominantly on its now trademark speed. This evolution is even more prominent in [[VideoGame/SonicTheHedgehog2 its sequel]].
* PortOverdosed: The original 1991 game. There is hardly a platform for which Sega has not released a version since going third-party.
* [[PromotedFanboy Promoted Fanboys:]] Pop duo Cash Cash, the people responsible for the vocals in [[VideoGame/SonicColors "Reach for the Stars"]] and some of the tracks in ''VideoGame/SonicGenerations'', are big Sonic fans themselves.
* TalkingToHimself: In ''Anime/SonicX'' and the games through 2005-2010, JasonGriffith did both Sonic and Shadow — not to mention Jet the Hawk in ''VideoGame/SonicRiders''. JaleelWhite also voiced Sonic, Sonia, and Manic in ''WesternAnimation/SonicUnderground''. Ryan Drummond who portrayed played Sonic in the old(er) pre-4Kids games also voiced Knuckles in ''VideoGame/SonicShuffle''. On top of that, he and Metal Sonic shared the same voice actor in both the Japanese and American versions of ''VideoGame/SonicHeroes''.
* TropeNamer for:
** BadFuture
** CasinoPark
** EternalEngine
** GreenHillZone
** PalmtreePanic
** SuperMode
** UltimateLifeForm
* WhatCouldHaveBeen: Sonic went through several character designs before he was settled on as a hedgehog, including a fox, a dog, a rabbit, an armadillo, and a TheodoreRoosevelt look-alike in pajamas. Also, his original name was "Mr. Needlemouse" (from a literal translation of the Japanese word for hedgehog, harinezumi). The armadillo idea would later become Mighty the Armadillo, and the rabbit idea is the basis for [[VideoGame/{{Ristar}} another Sega game]] (but with a star instead of a rabbit). Of course, we all know who the Roosevelt man turned out to become. Also, the "Roosevelt" concept was attached to an idea of the hero being some type of "dream warrior" that fought nightmare creatures, likely as a counter to ''VideoGame/SuperMarioBros2.'' This idea obviously ended up getting reworked over the decade and turned into ''NightsIntoDreams''.
** Oh, and he was also gonna have a {{cute little fang|s}} sticking out.
** Robotnik's original design was actually intended as the design for the hero, until a change in direction. His concept was actually TheodoreRoosevelt in pajamas.
** At one point in development, he was much larger and not the main antagonist.
** Sonic could have had a human love interest named Madonna.
** Sonic the Hedgehog 2 was ''intended'' to involve TimeTravel with a Good Future and BadFuture possible but the limitations of the Genesis cartridges at the time of development in 1991 prevented this. About Six months later ''SonicCD'' started development with the concepts intact and was released in 1993.
** Sonic 3 was intended to have both Tails and Knuckles as playable characters but, after being rushed for time, only Tails was left in the game planning. You can play as Knuckles when the [=S3=] cartridge is locked onto the [=S&K=] cartridge, however.
** Sonic & Knuckles and Sonic 3 w/ Lock On Technology were intended to be a single large game, code named Project Blue Red in alpha and beta stages, Sega realized that the cost of producing this one game (which would need to be larger then their own self-set system cartridge limits allowed) would out weight the cost of splitting it down and making two games which could be linked together.
** Tails was originally planned to be a {{Tanuki}}, but this apparently caused confusion due to the {{Main/Mario}} franchise already having the Tanooki Suit, so he was made a fox instead.
* There are exactly four games in the entire franchise where Sonic does not appear at all, not even as a cameo; DrRobotniksMeanBeanMachine, TailsSkypatrol, TailsAdventure and Tails and the Music Maker.
** Likewise, Eggman has had the honor of either starring or cameoing in almost ''every single game in the franchise'', with the exceptions of TailsAdventure, TailsSkypatrol, Tails and the Music Maker and SonicAndTheBlackKnight.
* Both Metal Sonic and his earlier version, Silver Sonic, can be seen in tubes in the Final Egg section of the Mystic Ruins in ''Sonic Adventure''.
* Want to know which version of the original ''VideoGame/SonicTheHedgehog'' you're playing? Check out the clouds in Green Hill Zone. In the Japanese versions, they scroll, but in the U.S. versions, they're static.
* Also from the [[VideoGame/SonicTheHedgehog original game]], there was originally supposed to be a sound test menu with an animated band "playing" the music while Sonic partakes in some breakdancing. It was nixed so the game could meet deadlines, and its space was replaced with the famous "SAY-GUUUUH!" choir heard at the end of Sega's Japanese adverts for the [[VanityPlate company logo]].
** Furthermore, the synthesis player of the band, Vector the Crocodile, would go on to become a supporting player in the series.
* Yuji Naka reportedly added the seventh emerald and Super Sonic to ''Sonic 2'' as a ShoutOut to ''DragonBallZ''. To make it even more obvious, in ''Sonic 3'', Super Sonic had green eyes.
** Also introduced in Sonic 2, the Death Egg was a ShoutOut to the Death Star from StarWars. Supposedly this was to balance out the Japanese fanservice with some American fanservice.
* The giant skeleton platform seen in [[VideoGame/SonicHeroes Mystic Mansion]] resembles the character select screen of ''VideoGame/GoldenAxe II''.
* There's an infamous "bug" in the original Sonic Genesis game where, if you land on a group of spikes after being hit without wearing a shield and without landing on the ground first, you will die regardless of the fact that you're supposed to have MercyInvincibility, at that point. "Bug", because until recently [[http://info.sonicretro.org/Spike_damage_behavior it was thought to be a bug, and not a preprogrammed behavior]]. Fortunately, all sequels and future releases of the game eliminate this "bug".
* Almost all badniks in ''VideoGame/SonicCD'' are based on bugs. The exception is Bigbom, a GiantMook version of Sonic 1's Bomb badnik.
* Sonic characters do not have toes. However, in the cartoons, they do. And if ''[[VideoGame/SegaSuperstars Sonic & All-Stars Racing Transformed]]'' is anything to go by, they seem to have toe bones despite not having toes.
* Amy was originally brown and called "Rosy".
[[/folder]]

[[folder: Animation]]
* HeyItsThatVoice:
** Some of the ''[=SatAM=]'' voice actors are JimCummings (Robotnik), [[FamilyMatters Jaleel White]] (Sonic), CharlieAdler (Snively), Creator/CreeSummer (Dulcy), TimCurry (King Acorn), KathSoucie (Sally), RobPaulsen (Antoine), ChristineCavanaugh (Bunnie)... among others. The team of actors providing the voices for this show each have a long list of acting gigs under their belts, so it would be surprising if you didn't recognize at least ''one'' of the characters voices from somewhere else.
** MasamiKikuchi voiced Sonic in the two-episode Japanese [=OVAs=].
* ScrewedByTheNetwork: ABC put ''[[WesternAnimation/SonicSatAM SatAM]]'' up against ''PowerRangers''. The results were not pretty. Also, since this was the time when ABC affiliates started airing Saturday Morning ''Newscasts'', some markets never even saw the show first-run.
* WordOfGod: The answers to questions about the series-ending cliffhanger to ''[=SatAM=]'' were eventually discovered in interviews with the writing staff, including some plot threads which were supposed to continue from this point, such as Snively's HeelFaceTurn, Robotnik becoming Naugus' Right Hand Man as the latter became the series' BigBad, the introduction of Knuckles, and increased prominence for Tails.
[[/folder]]
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