%% Image and caption selected per Image Pickin' thread: http://tvtropes.org/pmwiki/posts.php?discussion=1334926372016254700
%% Please do not change or remove either without starting a new thread.
[[quoteright:350:[[VideoGame/TeamFortress2 http://static.tvtropes.org/pmwiki/pub/images/119thUpdateCelebration_6277.png]]]]
[[caption-width-right:350:This was meant to be the 100th update.\\
[[ScheduleSlip Valve Time happened.]]]]

->''"I will not celebrate meaningless milestones."''
-->-- '''Bart's [[CouchGag chalkboard gag]]''', ''WesternAnimation/TheSimpsons'', "Sweet Seymour Skinner's Baadasssss Song" (100th episode)
%% One quote is sufficient. Please place additional entries on the quotes tab.

Show pilots are a very tricky process. They are made, and even if they get a chance on the air, the vast majority of them fail within a few weeks. With other shows, they sometimes will build up a dedicated audience that will fail to keep the show alive long enough. [[TheFireflyEffect Most of the time]].

Most full television seasons are between 20 and 26 episodes long. There are various exceptions, animated shows can go from 13 episodes to well over 40 episodes. With such a vicious market, the ability to reach the ''100'' episode mark is a rare and coveted thing. So when a show does achieve that milestone, they plan something big to not only draw ratings, but to break out into the [[EpisodeCodeNumber three digit episodes]].

This will often coincide with the VerySpecialEpisode, but it could also be the TonightSomeoneDies or other similar episodes. It may avoid all of that and the episode is just given an additional polishing to make it one of the best episodes of the series. It may also result in an InternalHomage, when elements (or even the entire plot) of the series' first installment is directly homaged in celebration of the event.

In the case of LongRunners and shows where a hundred episodes is not that big of a deal, the celebration is sometimes in the form of "10 Year Anniversary" or something similar.

Part of the celebration is that pure money is offered with syndication rights, which a general rule of thumb is to have 100 episodes to air in certain time slots like ''Nick at Nite'' does. Because the show was already financed and produced, this will bring in the nostalgic viewers without much effort.

But no matter what, remaining in the public view for five years is an impressive event in any form of media.

''Remember, Administrivia/ExamplesAreNotRecent.''



* For the 30th anniversary (2008) of both Creator/RumikoTakahashi's first published short story (''Katte na Yatsura'') and the manga version of ''Manga/UruseiYatsura'', three new OVA episodes (one for each of ''Urusei Yatsura'', ''Manga/RanmaOneHalf'', and ''Manga/InuYasha'') were made, along with an animated short {{crossover}} of those three series. (The ''Inu Yasha'' OVA episode, which covered the Black Tessaiga arc, was later reused as part of the second TV series.) These were initially shown during that year at a gallery show, called "It's a Rumic World", which also featured manga manuscript pages and other illustrators' drawings of Takahashi's characters on display.
* To celebrate Shonen Jump's 40th anniversary, there was a special anime tour moving through ten cities in Japan, showing anime movies that had been made just for the occasion. This included a new ''Manga/{{Dragonball}}'' [[Anime/DragonBallYoSonGokuAndHisFriendsReturn special]], which concluded its anime run (in Japan anyway) eleven years ago, making it a bit of a milestone celebration for Dragon Ball as well.
* On April 10, 2014, for the tenth anniversary of ''LightNovel/ACertainMagicalIndex'' and his debut as a writer, Creator/KazumaKamachi made ten announcements about his various works, including a MassiveMultiplayerCrossover between his novels.
* ''Anime/AquarionLogos'' was made to celebrate the series' 10th anniversary.
* For ''Manga/AzumangaDaioh's'' tenth anniversary, the manga was re-released with [[ArtEvolution updated artwork]] and new chapters.
* ''Anime/{{Diebuster}}'' was made to commemorate Creator/StudioGainax's 20th anniversary.
* ''Franchise/{{Digimon}}'' had a sequel series to ''Anime/DigimonAdventure'' announced on August 1, 2014, 15 years to the day the seven main characters were brought to the Digital World.
* ''Anime/DragonBallKai'' was released in Japan in 2009 to celebrate the 20th Anniversary of ''Anime/DragonBallZ''. Five years later in 2014, after the series had previously been cancelled in 2011 with one arc left to be redone, it was brought back to do the final arc, just in time for its 25th Anniversary. That same year, Americans got to join in on the celebration: not only was it announced that ''Kai'' would now be airing uncut on {{Toonami}}, but Funimation announced that they were giving the ''[[Anime/DragonBallZBattleOfGods Battle of Gods]]'' film an English dub and giving it a limited run in theaters.
* The ''Franchise/{{Gundam}}'' franchise has had several over the course of its long life:
** The 10th anniversary was marked by the ''All That Gundam'' special and the OAV ''[[Anime/MobileSuitGundam0080WarInThePocket Gundam 0080]]''.
** The 15th anniversary was celebrated with ''[[Anime/MobileFighterGGundam G Gundam]]'', the first AU Gundam series.
** The 20th anniversary saw the "Gundam Big Bang Project", which included movie versions of ''Anime/MobileSuitGundamWingEndlessWaltz'' and ''Anime/MobileSuitGundamThe08thMSTeam'', culminating with ''Anime/TurnAGundam'' and the live-action movie, ''Film/GSaviour''.
** The 25th anniversary saw the ''[[Anime/MobileSuitZetaGundam Zeta Gundam]]'' movie trilogy (which also celebrated the 20th anniversary of the series), ''[[Anime/MobileSuitGundamSEEDDestiny Gundam SEED Destiny]]'' (which was itself a reimagining of ''Zeta Gundam''), and ''Anime/{{Mobile Suit Gundam MS IGLOO}}: The Hidden One Year War''.
** The 30th anniversary was celebrated with the ''[[Anime/MobileSuitGundam00 Gundam 00]]'' film, ''[[Anime/Gundam00AWakeningOfTheTrailblazer A wakening Of The Trailblazer]]'', the first feature-length Gundam film in 19 years. It also featured a special animation showing all the protagonist Gundams in action together. And of course, they built a life-size statue of the original.
** The 35th anniversary was commemorated with three major releases: the anime adaptation of ''Manga/MobileSuitGundamTheOrigin''; a new series called ''Anime/GundamReconguistaInG'', Creator/YoshiyukiTomino's first original Gundam work since ''Anime/TurnAGundam''; and the final episode of ''Anime/MobileSuitGundamUnicorn''.
** ''Anime/MobileSuitGundamSEED'' celebrated its 10th anniversary with the release of the HD Remasters of both ''Gundam SEED'' and ''Gundam SEED Destiny''.
* ''Manga/{{Inuyasha}}'' did a special retrospective type episode for its 100th. All the characters got stuck in demon moth cocoons and thinking about how [=InuYasha=] always helped them out while [=InuYasha=] was trying to rescue them.
* ''Anime/{{Macross}}'':
** ''Anime/MacrossFrontier'' was originally planned as a 25th anniversary for ''Anime/SuperDimensionFortressMacross''. It ended up a year late, but the show was still full of references to the number 25: the new fighter was the VF-25, Frontier was the 25th fleet, the main Macross ship was the Macross Quarter (25%), etc. The show also related to elements of all the previous Macross series.
** ''Anime/MacrossII'' was released in 1992 to celebrate the 10th anniversary of ''SDF Macross'', but it was [[GodDoesNotOwnThisWorld done without Studio Nue's involvement]]. As a result, Studio Nue/Satelight declared ''Macross II'' to be an AlternateContinuity work.
** The franchise celebrated the 30th anniversary with ''VideoGame/Macross30TheVoiceThatConnectsTheGalaxy'', a video game which brought characters from all the different shows (minus ''Macross II'') in an original story, justified via TimeTravel.
* The ''Manga/{{Naruto}}'' manga celebrated its ninth anniversary with a page showing Gaara and Naruto posing with a certain group of seven other people.
** They did this yet again for its tenth anniversary in chapter 434 with a cover of Naruto clones working on a puppet of his newly-acquired Sage-Mage enhanced Rasenshuriken technique.:[[http://3.bp.blogspot.com/__yDg-uqoS6I/THjHz2VtYiI/AAAAAAAAAO0/lOBwAd7qF44/s1600/01-02.jpg]]
** The anime had an {{omake}} for the 349th episode about the characters celebrating the 350th episode...which ''the title character himself'' wasn't invited to because ''he was not in it'' (the whole episode was about Sasuke and Itachi), and then noting that before this he was absent for the 100th episode (which was about Might Guy, Rock Lee, and Tsunade) and the 300th (the episode of the fight against Hidan and Kakuzu ''right'' before he showed up). Which is funny, because most of the characters who ''were'' invited there [[HypocriticalHumor weren't in that episode either]].
* ''Anime/{{Ojarumaru}}'' celebrated its 15th anniversary in 2012 by having a 3rd special air on March 20. A character event was hosted at the NHK Studio Park Event Hall from August 21 to September 17. Episode 1334 had a ShoutOut to ''Manga/NintamaRantarou''. In addition, NHK aired the top 10 episodes of Ojarumaru in a different attire [[note]] This was part of an event called "Cosplay Ojarumaru 50" in which people in Japan from September 3 to December 7 could vote on the best episodes of Ojarumaru in a different attire, which would later air on NHK in late December. 10 episodes were then selected by NHK based on the most popular votes, half of which were older episodes. [[/note]] from December 24, 2012 to January 10, 2013.
* ''Manga/OnePiece'':
** ''Anime/OnePieceFilmStrongWorld'', the 10th movie corresponding to the series' 10th year anniversary, was penned by Creator/EiichiroOda himself; as confirmed by WordOfGod, this means that this is part of the manga's canon. However, this is largely {{averted}} in the ''Manga/OnePiece'' anime itself. No milestones in the series are particularly heralded as special events, and significant events only happen on episodes 250 (end of Franky's origin flashback), 300 (Zoro's defeat of [[spoiler:[=CP9=]'s Kaku]]) and 400 (Silvers Rayleigh talking about Gold Roger).
** The 100th chapter marks the end of the East Blue Saga, and thus, the beginning of the crew's Grand Line journey, complete with an in-universe launching ceremony at the end of the chapter. (In the anime, this was episode 53, so not much of a milestone.) In fact, Oda actually cut out a couple of planned sidestory chapters from the manga (which made it into the anime) in order to specifically invoke this.
* ''Anime/OsomatsuSan'' is for Akatsuka Fujio's 80th birthday. Instead of embracing its 60s look wholeheartedly, it instead uses it for comedic effect with [[AffectionateParody its parodies]].
* ''Anime/{{Pokemon}}'':
** The special episode ''Anime/PokemonTheMastermindOfMiragePokemon'' was made in part to celebrate 10 years since the franchise launched with the ''VideoGame/PokemonRedAndBlue'' GameBoy games in Japan in 1996. The kicker, it aired in the U.S. ([[TheOtherDarrin with new voice actors]]) first, where the fans there only had Pokémon since 1998.
** Another, more subtle way to celebrate an anniversary in the anime is ''Spurt!'', the 10th OpeningTheme. It shows '''all''' the Pokemon that Ash has ever obtained in the series, but [[BaitAndSwitchCredits most of them never showed up in the corresponding season]].
** The Anime has also been none too shy with "hundred" episodes. (This list includes episodes with numbers X99 and X00 by Bulbapedia reckoning because said reckoning excludes two {{Lost Episode}}s aired out-of-order but includes the {{Banned|Episode}} Porygon Episode.)
*** 399: The group arrives for the Evergrande Conference; 400: The Tournament starts
*** 499: A {{cosplay}} episode wherein Brock wins a Happiny Egg
*** 597-8: Ash vs Paul 1st time (599 has Ash's recovery as well as Brock's meeting with Uxie)
*** 699: Iris' victory in the first Club Battle Tourney OR 700: The beginning of the [[HeelFaceMole Heel Face Meowth]] arc.
*** 800: The start of the X & Y saga (Conversely, 799 ends the "Best Wishes" saga.)
*** 900: [[spoiler:Team Flare's second appearance and Zygarde Core temporarily transforms into 10% forme]]
** The 1''20''th episodes of both the "[[Videogame/PokemonRubyAndSapphire Advanced]]" and "[[Videogame/PokemonDiamondAndPearl Diamond & Pearl]]" sagas[[note]]Episodes 394 and 586 respectively[[/note]] were {{Clip Show}}s of the respective sagas to date. The latter was also the last one made in Standard Definition.
* ''Franchise/PrettyCure'' actually had ''two'' 5th anniversary celebrations, both beginning the ''Anime/PrettyCureAllStars'' film series. The first was the short ''Go Go Dream Live'', which had the first team up between the ''Anime/FutariWaPrettyCure Max Heart'', ''Anime/FutariWaPrettyCureSplashStar'' and ''Anime/YesPrettyCure5 Go Go'' teams. The full movie ''Anime/PrettyCureAllStars DX'' is a big screen revamp of that short, including the ''Anime/FreshPrettyCure'' team. ''Anime/PrettyCureAllStars DX 3'' celebrated 10 ''Pretty Cure'' movies (quite the feat for a magical girl series). ''Anime/HappinessChargePrettyCure'' marked exactly 10 years to the beginning of the original series ''Anime/FutariWaPrettyCure'' with a CouchGag where a Cure from the past would introduce the show. That season also celebrated 500 episodes of the franchise. The eighth ''Anime/PrettyCureAllStars'' movie "Everybody Sing - Miraculous Magic" will be the franchise's 20th film.
* ''Anime/RanpoKitanGameOfLaplace'' is for the 50th anniversary since Edogawa Rampo's passing, and updates itself in most of its aspects to appeal to modern viewers.
* ''Anime/SailorMoon'' ended with episode 200. And a ContinuityReboot anime, ''Anime/SailorMoonCrystal,'' was announced on the franchise's 20th year of existence. Some of TheMerch for ''Crystal'' also bears the 20th anniversary celebration logo, despite being released two years later.
* ''LightNovel/{{Slayers}}'':
** In 2006, for the 15th anniversary, Music/MegumiHayashibara released a new single, ''Meet Again,'' and it was accompanied with a new animated music video of the characters, making it the first animated feature for the franchise since the ''Slayers Premium'' movie in 2001.
** The franchise celebrated its 20th anniversary with re-releases: both new cover art and slight changes in dialogue for the [[LightNovel light novels]] and new boxart complete with [[{{Feelies}} new supplementary materials]] for the anime.
* For the 40th anniversary of the ''Anime/TimeBokan'' franchise, Creator/TatsunokoProduction released ''Anime/YattermanNight'', a ContinuityReboot of the franchise's second series. ''Anime/{{Karas}}'' was made for the 40th anniversary of the studio itself.
** Before, the episode 40 of ''Yattodetaman'' celebrates the sixth anniversary of the franchise. Here, the characters interpret themselves in a theatrical play and some of the other characters from the previous series appear in the audience during this performance.
* The ''Anime/YuGiOhTenthAnniversaryMovie'' [[ExactlyWhatItSaysOnTheTin marks the ten years]] of the ''Anime/YuGiOh'' anime series (not including the Toei series), featuring the main protagonists of the original, [[Anime/YuGiOhGX GX]], and [[Anime/YuGiOh5Ds 5Ds]] series [[BatFamilyCrossover teaming up]].
** ''Anime/YuGiOhTheDarkSideOfDimensions'' will commemorate the franchise's 20th anniversary.
** ''Anime/YuGiOhArcV'''s 73th episode is the 777th episode if all the series' episodes were combined. For this reason, it got a special opening where all of the previous series' protagonists get cameos.
* On August 2015, in honor of the 10th Anniversary of the Manga/HappyHappyClover series. Comiiket 88 sold a [[http://lagomorphintime.tumblr.com/post/129782677728/happy-happy-clover-fan-books-the-one-on-the Happy Happy Clover Anthology submitted by various artist and fans of the manga in Japan]]. The anthology also contained artwork celebrating the 10th Anniversary of the original publication of the manga on Ciao Magazine.

[[folder:Comic Books]]
* In ''ComicBook/{{Spawn}}'' #100, Malebogia, the Big Bad of the first 99 issues, is killed off. Spawn's nemesis/occasional ally, Angela, is also killed.
* ''Comicbook/SonicTheComic'' celebrated its 100th issue (and, by extension, 200th week in existence) by ending the Robotnik Rules arc, which had been going on since issue 9. Some argue it [[JumpTheShark Jumped the Shark]] then. Webcomic/SonicTheComicOnline 261 issue celebrated the 20 years anniversary of ''Comicbook/SonicTheComic''.
* ''Comicbook/ArchieComicsSonicTheHedgehog'':
** Other Sonic anniversary issues:
*** Issue #25: ''VideoGame/SonicCD'' adaptation
*** Issue #50: Conclusion of the "End Game" story arc, where [[spoiler:Dr. Robotnik is KilledOffForReal]].
*** Issue #75: Following the development from #50, [[spoiler:an alternate-universe Robotnik resembling the games' "Eggman" version is instated as the new BigBad]].
*** Issue #100: Freedom Fighter reunion
*** Issue #125: [[spoiler:Sonic is apparently killed]]
*** Issue #150: Evil Sonic mucking things around
*** Issue #175: Eggman destroys Knothole and completely defeats Sonic.
*** Issue #200: Sonic foils another one of Eggman's schemes which causes him to go through a massive VillainousBreakdown that he completely loses what left of his sanity and put out of commission. [[spoiler: Leaving the way for Snively to take over and kickstart the Iron Dominion arc.]]
*** Issue #225: [[spoiler:''Sally'' is apparently killed and kicks off the ''Sonic: Genesis'' storyline]]
*** Issue #250: The beginning of the third and final act of the CrisisCrossover ''Comicbook/SonicTheHedgehogMegaManWorldsCollide'', [[spoiler:setting up the massive CosmicRetcon that would befall the "Prime" Zone after the crossover ended. Ironically, the narrative of the issue as a standalone would be more befitting a ''Mega Man'' milestone than a ''Sonic'' one, as the bulk of it is a BigBadassBattleSequence against ''nearly every Robot Master to have ever existed.'']]. [[WhatCouldHaveBeen Originally, it was supposed to have been the conclusion of the Mecha Sally storyline.]]
*** Issue #275 is the second to last issue of the ''ComicBook/SonicTheHedgehogMegaManWorldsUnite'' storyline.
** ''Sonic Universe'':
*** It [[ScheduleSlip was supposed]] to celebrate its 50th issue with a tale set outside of the Archie continuity: [[TheResolutionWillNotBeTelevised an epilogue story]] for ''SonicUnderground''. The story will still occur, albeit later.
*** ''Sonic Universe'' #25 kicked off Silver's storyline.
*** #75 is another Metal Sonic-based story.
** ''Knuckles The Echidna'' #25 had Knuckles be fully reunited with his father Locke.
* Both of ''ComicBook/MegaMan'''s milestone issues involved the ''Worlds Collide'' and ''Worlds Unite'' storylines.
* ''ComicBook/CerebusTheAardvark'' ended with issue #300. This event had been planned for ''27 years''. The previous centennial issues each featured major turning points in his life: issue 100 [[spoiler:introduced Cirin, the BigBad of the series, and revealed that she was an Aardvark like Cerebus. Issue 200 has Cerebus meet [[AuthorAvatar his creator]] in space, and upon his return he gives up on adventuring and settles into the life of a barfly.]]
* ''ComicBook/{{Legion Of Super-Heroes}}'' had a #300 in 1983 which was the 25th anniversary, which put to rest the [=AdultLegion=] story and brought back artists (and even logos) from various eras of the Legion. Natural for a comic published every month for 25 years--except it wasn't. The Legion had moved between comics and ended up getting the numbering of the ''Superboy'' comic, which wasn't monthly throughout its run; the fact that issue #300 was the 25th anniversary was ''pure coincidence''. Also, the 10th anniversary (Superboy #147, 1968) finally revealed the origin of the Legion. The 30th anniversary (volume 3, #45, 1988) brought back the older artists again. The Legion has also done standard anniversary issues according to the cover numbering, meaning that V3 #50 was an anniversary issue with a letter column commenting on another anniversary issue.
* Comicbook/SpiderMan:
** Amazing Spider-Man #50 was the famous "Spider-Man No More!" story where Peter quits being Spider-Man (duh), but finds himself unable to quit as the Kingpin (the future ''ComicBook/{{Daredevil}}'' RoguesGalleryTransplant) rises to power.
** Issue 100: Peter tries to remove his powers, and has an acid-trip dream where he fights the Vulture, the Lizard, the Kingpin, Doctor Octopus, and the Green Goblin before seeing an image of the deceased George Stacy. When he wakes up, Spidey discovers he has six arms, kicking off the Six-Arm Saga that introduced Morbius.
** Issue 200: Spider-Man faced Uncle Ben's killer, the Burglar (who was now working with Mysterio) once more.
** Issue 300: First full appearance of Venom.
** Issue 365: Celebrated the 30th anniversary of the web-spinner with a story that had Spider-Man fighting the Lizard again, the re-introduction of Peter's parents (who would later be proven to be androids), a sick poster of Spidey, Venom, and Carnage, and a preview of ''ComicBook/SpiderMan2099''.
** Issue 400: Ended with [[GoIntoTheLight the death of Aunt May]] and the revelation that she'd known Peter was Spider-Man for years. Most of the fandom agreed it was a fitting sendoff for the character. Naturally, this was [[NotQuiteDead retconned a little over a year later...]]
** Issue 500: Spidey helps Doctor Strange and several other heroes deal with a demon invasion in New York, magically revisits several moments in his past, and [[spoiler:gets to meet Uncle Ben's ghost for five minutes thanks to Strange.]]
** Issue 600: An upgraded Doctor Octopus attempts to make up for his past misdeeds by taking electronic control of New York City, the idea being that he can make everything far more efficient. Unfortunately, his subconscious mind attacks Spider-Man, endangering everyone around him, and tries to ruin the arrangements for Aunt May's wedding to J. Jonah Jameson Senior. Spidey beats Doc Ock at the site of their very first battle, and May and JJJ Sr are married by Jonah himself. Oh, and [[spoiler:Mary-Jane shows up to catch the bouquet.]]
** For Spidey's 50th anniversary in 2012, Marvel did:
*** [[ComicBook/SpiderMen The first-ever crossover]] between the MarvelUniverse and the UltimateMarvel universe; as Peter Parker faces a world where he was killed in action and Miles Morales (the new Ultimate Spidey) sees what his predecessor might have grown up to be.
*** A separate storyline where Spider-Man took on a KidSidekick [[spoiler:which ended badly; the kid quickly became a SmugSuper and Spidey had to depower him before he became even worse.]]
*** Issue 700: ''Amazing Spider-Man''[='=]s final issue leading into its Comicbook/MarvelNOW replacement ''Superior Spider-Man''; the conclusion of a long-running subplot where Doctor Octopus was dying from injuries accumulated from his many fights with Spider-Man - but not before [[spoiler:pulling a FreakyFridayFlip on Peter and wearing mind-swap-protection armor to secure his position; unable to regain his true body, Peter implants his memories into Doc Ock and convinces him to not ruin the reputation of Spider-Man as Doc Ock's former body passes away, taking Peter's mind down with it. [[HeelFaceTurn This turns the villain into the Superior Spider-Man]].]]
* Creator/DonRosa has done quite a few of these for various characters in the ComicBook/DisneyDucksComicUniverse:
** For the 60th anniversary of DonaldDuck's creation, he wrote "The Duck That Never Was", an ItsAWonderfulPlot story set on Donald's birthday.
** He also did "W.H.A.D.A.L.O.T.T.A.J.A.R.G.O.N", a story for the 60th anniversary of Huey, Dewey, and Louie's first appearance that was a WholeEpisodeFlashback to the day the nephews joined the Junior Woodchucks.
** For Scrooge [=McDuck=]'s 50th anniversary, Rosa wrote a story "ComicBook/ALittleSomethingSpecial", where [[VillainTeamUp Scrooge's biggest enemies plot to rob him]] during a celebration of the anniversary of the day Scrooge arrived in Duckburg. It took ten years for the story to be published in Brazil and it served not only to celebrate Scrooge's 60th anniversary but also to celebrate issue 500 of his Brazilian comic book line.
** Even Gyro Gearloose got a 50th anniversary special, "Gyro's First Invention", which featured a WholeEpisodeFlashback that explained where his little robot Helper came from, ''and'' explained how he helped Scrooge get the money in his money bin out of the sinkhole it fell into after the events of Creator/CarlBarks' "A Christmas for Shacktown".
** Furthermore, there is Gladstone Gander's 50th anniversary special, "The Sign of the Triple Distelfink", wherein he tries to avoid his own birthday party, in order to hide the fact that his birthday is the one day of the year when his legendary luck leaves him. A flashback in this story reveals he was literally BornLucky, having inherited his good luck from his mother.
* Most ArchieComics digests will have special stories for their Milestones, where the characters discuss exactly how they should celebrate said milestone. Archie Double Digest #200 celebrated 200 issues with the start of a 4 part "New Look" story entitled ''Archie Goodbye Forever'', and even bigger than that, Archie #600 celebrated 600 issues with the start of a 6 part story entitled ''Archie Marries Veronica'' ([[spoiler:of which the final three parts [[HalfwayPlotSwitch switched to]] ''Archie Marries [[BettyAndVeronica Betty]]'']]).
* In 1985, DC Comics celebrated their 50th anniversary with ''ComicBook/CrisisOnInfiniteEarths'', which brought a {{Cosmic|Retcon}} ContinuityReboot upon the Franchise/DCUniverse. Later on, 2005-2006's ''ComicBook/InfiniteCrisis'' took place twenty years after the original Crisis.
* In the Franchise/DCUniverse, several ComicBook/PostCrisis titles hit #100 at about the same time in UsefulNotes/TheNineties. All of them were given special prismatic covers. In addition:
** ''Franchise/{{Superman}}'' launched "The Death of Clark Kent" {{arc}}, in which Superman temporarily gave up his secret identity.
** ''Franchise/WonderWoman'' had the death of Diana's AntiHeroSubstitute, Artemis, leading to the [[StatusQuoIsGod restoration of the status quo]].
** ''[[Franchise/JusticeLeagueOfAmerica Justice League America]]'' gave honorary membership to the entire DCUniverse, and then had a big fight against Lord Havok (revealed to the reader, but not the team, to be Maxwell Lord). And then Guy Gardner showed up, kicking off the "Way of the Warrior" CrossOver between ''JLA'', Guy's own title and ''ComicBook/{{Hawkman}}''.
** ''ComicBook/GreenArrow'' had the title character killed and [[LegacyCharacter replaced by his son]]. ([[BackFromTheDead He got better]], but not for a decade).
** TheFlash discovered the Speed Force, the source of all super-speedsters' powers which continues to affect the series to this day. He then used it to give himself a serious power upgrade and save his city from the brink of annihilation.
** In ''Franchise/GreenLantern'' (Vol. 3) #100, then-current Green Lantern Kyle Rayner teams up with a time-displaced Hal Jordan, prior to his FaceHeelTurn as Parallax. It's also the prelude to the "Emerald Knights" story arc.
* Creator/MarvelComics:
** In July 1986, they celebrated their 25th anniversary (the 25th anniversary of the ''ComicBook/FantasticFour'', their flagship [[UsefulNotes/TheSilverAgeOfComicBooks Silver Age]] title) with a cover theme - every comic published in that month had a portrait of a character on it surrounded by a border containing various characters. Even the licensed comics got in on the act.
** In 2009 when Marvel celebrated their 70th Anniversary [[labelnote:note]]Marvel Comics was originally under the name of Timely Comics.[[/labelnote]], many comics were published with Variant Covers with a style very similar to the 25th Anniversary listed above.
** In 2014, they celebrated their 75th anniversary...by releasing five comics [[ComicBook/MarvelOneHundredthAnniversarySpecial set in the year 2061]], which is when they will celebrate 100 years of Marvel.
* ''Comicbook/TheDandy'' and ''ComicBook/TheBeano'' celebrated their 60th birthdays and 1997 and 1998 respectively. Both put out double-length issues in which ''The Dandy'' resurrected numerous older strips, while ''The Beano'' printed a series of stories based around the number 60. Both also hit issue 3000 around the year 2000. ''The Beano's'' honouring of this was nothing special, but ''The Dandy'' featured a series of stories based around trouble caused by the '3000 bug', a spoof of the then-recent millennium bug scare.
* ''Comicbook/TwoThousandAD'' has done a few:
** For the 10th anniversary, a badge reading '10 years of Thrills' was inserted somewhere in each strip.
** For the 30th anniversary, which was also the 30th anniversary of the first ''ComicBook/JudgeDredd'' strip, they began the "Origins" story, which explains how the world of ''Judge Dredd'' came to be. John Wagner had been planning on writing that story for a while, but figured that the 30th anniversary was the right time to publish it.
** The 10th anniversary of ''2000 AD's'' sister title, ''Judge Dredd Megazine'', ran Judge Death's OriginStory.
** In 2010, the Meg's 300th issue and 20th anniversary occurred within two issues of each other, and so issues 300, 301, and 302 were all double-length (and the price was raised by a pound; issue 303 was still 50p more than 299, grumble grumble). Across all three were run two special features:a three-part in-depth interview with Carlos Ezquerra, and past writers and artists reminiscing about their favourite parts of the Meg. Issue 302's ''Judge Dredd'' strip was full of all sorts of continuity nods and the final panel, while [[LeaningOnTheFourthWall making perfect sense in the context of the story, was clearly a happy birthday message to the Meg]].
* For its [[PrintLongRunners 80th anniversary]], ''ComicStrip/DickTracy'' ran a storyline from [[http://john.seikdel.net/gocomics.php?date=110918&comic=tmdic September 18]] to [[http://john.seikdel.net/gocomics.php?date=111023&comic=tmdic October 23, 2011]], which doubles as a follow up on a 1948 story arc and an update of the first storyline (as recounted by Sam Catchem to Lizz Worthington).
* ComicBook/CaptainAmerica:
** The 70th Anniversary, in addition to being right around the time [[Film/CaptainAmericaTheFirstAvenger the movie]] was released, featured Steve Rogers once again donning the identity after previously leaving his former sidekick James Buchanan Barnes to fill in the role. Marvel also released multiple variant covers to comics released in July which featured everyday Americans and real American heroes alike all bearing Cap's signature red-white-and-blue colors.
** The 75th anniversary for Cap, in 2016, will be portrayed with the Avengers storyline ''Standoff! - Assault on Pleasant Hill'' and not only involve all Avengers teams, but also three Captain Americas - Steve Rogers, Bucky Barnes and current Cap Sam Wilson.
* {{Superman}} returned to his trademark look and had his classic powers restored after the controversial energy being storyline for his 60th anniversary in the one-shot "Superman Forever."
* The final part of ''ComicBook/TheDeathOfSuperman'' fell on ''Superman'' #75. The issue that kicked off his return? ''The Adventures of Superman'' #500. The issue that brought him back to Metropolis? ''Superman: The Man of Steel'' #25. The tie-in issue of ''Superman'' volume 2 for ''ComicBook/JokersLastLaugh'' was #175. Naturally, the issue involved a [[SelfDemonstrating/TheJoker Jokerized]] Doomsday.
* ''ComicBook/BatmanEternal'' was a year-long weekly series taking place as part of Batman's 75th anniversary. ''ComicBook/BatmanAndRobinEternal'' is a shorter, six-month-long weekly series taking place as part of Robin's 75th anniversary.
* Issue #50 of ''WesternAnimation/ThePowerpuffGirls'' (DC run) featured a story originally intended as a season five episode of the TV show. The episode went over budget and faced a tight deadline, so the storyline was given to DC to make as a comic.
* ''ComicBook/AstroCity'' marked its twentieth anniversary in a low-key fashion, with Vertigo issue #26 returning to the subject of the series' very first issue, Samaritan's dreams of flying.

* As a LongRunner, ''Series/DoctorWho'' and its Franchise/DoctorWhoExpandedUniverse have a plethora of anniversary stories. Uniquely, since the show was largely off the air during the anniversary periods of 1993 to 2003, it was up to the expanded universe to pick up the slack during those years.
** 10th anniversary (1973): "[[Recap/DoctorWhoS10E1TheThreeDoctors The Three Doctors]]", a ReunionShow that concludes the Doctor's exile on Earth since 1970. Interestingly, it didn't mark the actual date of the anniversary, being aired almost a year beforehand; instead, it marked the beginning of the show's tenth season.
** Averted with "[[Recap/DoctorWhoS16E3TheStonesOfBlood The Stones of Blood]]", which was the 100th story and aired on the show's 15th anniversary (1978). It was going to start with the Doctor and Romana celebrating his birthday with a cake, but the production team wisely vetoed it as too self-congratulatory. The staff did eat a cake during production of the serial, though.
** 20th anniversary (1983): "[[Recap/DoctorWho20thASTheFiveDoctors The Five Doctors]]", another ReunionShow. Unlike the other two canon TV anniversary reunion episodes, this one didn't mark a major status quo change for the Doctor.
** 1985 saw the 100th [[Literature/DoctorWhoNovelisations Target novelisation]], Robert Holmes' adaptation of his TV story "The Two Doctors", with an introduction by John Nathan-Turner, the TV series' producer at the time.
** 25th anniversary (1988): "[[Recap/DoctorWhoS25E1RemembranceOfTheDaleks Remembrance of the Daleks]]", which had the Doctor revisiting the site of [[Recap/DoctorWhoS1E1AnUnearthlyChild the first episode]] the next day (albeit hundreds of years later in his own timeline), and "[[Recap/DoctorWhoS25E3SilverNemesis Silver Nemesis]]", which was about a 25th anniversary, aired over the anniversary date, and had a cameo of Creator/NicholasCourtney and some program staff.
** 30th anniversary (1993):
*** TV: The non-canon "[[Recap/DoctorWho30thASDimensionsInTime Dimensions in Time]]", which was a Series/ChildrenInNeed ReunionShow skit that [[IntercontinuityCrossover crossed over]] with ''Series/EastEnders'', and the documentary "More than 30 Years in the TARDIS".
*** ''Magazine/DoctorWhoMagazine'' comics: "Time & Time Again", where the Seventh Doctor has to save his own timeline from the Black Guardian's rewriting by meeting his past selves.
** The fiftieth Literature/DoctorWhoNewAdventures novel is ''Happy Endings'' (1996) by Creator/PaulCornell, in which a new logo is introduced, [[WeddingDay Benny gets married]], [[ReunionShow a whole host of characters from previous novels are invited]], a lot of [[WhatHappenedToTheMouse dangling plot threads]] get resolved, and ''nearly every NA writer'' contributes a paragraph to the reception[[note]]aside from Jim Mortimore[[/note]].
** ''Doctor Who Magazine'' marked its 250th issue (1997) with the comic "A Life of Matter and Death", [[ReunionShow bringing back many of its characters]] in a battle inside the TARDIS' mind.
** 35th anniversary (1998):
*** Novels: The Literature/PastDoctorAdventures (sort of) novel ''The Infinity Doctors'', which features an unspecified Doctor and is filled with {{continuity nod}}s.
*** ''Doctor Who Magazine'' comics: "Happy Deathday", which pits the then-Eight Doctors against a LegionOfDoom of their greatest enemies. [[spoiler:The story turns out to be actually a video game the Doctor's companion Izzy has been playing on her spare time.]]
** ''Doctor Who Magazine'' celebrated its 20th anniversary (issue 283, 1999) with "TV Action!", a {{metafiction}}al comic strip where the Eighth Doctor and Izzy chase Beep the Meep to October 12, 1979[[note]]Just five days off the cover date of DWM's first issue, when it was ''Doctor Who Weekly''[[/note]] in a parallel universe where ''Doctor Who'' is just a TV show; there, they team up with none other than Creator/TomBaker[[note]]When ''Doctor Who Magazine'' began publication, Tom Baker was the incumbent Doctor.[[/note]].
** The 100th original BBC Doctor Who novel (counting the Literature/EighthDoctorAdventures and Literature/PastDoctorAdventures together) is ''Mad Dogs and Englishmen'' (2002) by Paul Magrs, which announces the fact on its cover, along with having its logo in reflective gold foil.
** 40th anniversary (2003):
*** TV: The revival of the series was announced in that period.
*** AudioPlay/BigFinishDoctorWho: The main event was "[[Recap/BigFinishDoctorWho050Zagreus Zagreus]]" (also the 50th Big Finish audio), a WhamEpisode that concludes the Anti-Time StoryArc which began [[Recap/BigFinishDoctorWho016StormWarning back at the Eighth Doctor's audio beginning]], sets the stage for the Divergent Universe story arc and casts a number of previous Doctor and companion actors in completely new roles. There was also the thematic Villains Trilogy of "[[Recap/BigFinishDoctorWho047Omega Omega]]", "[[Recap/BigFinishDoctorWho048Davros Davros]]" and "[[Recap/BigFinishDoctorWho049Master Master]]", which explores just how NotSoDifferent the Doctor is from his recurring enemies, and a web-animation of the unfinished Fourth Doctor story "[[Recap/DoctorWhoS17E6Shada Shada]]", substituting the Fourth Doctor for the Eighth[[note]]At that time, Creator/TomBaker was stubbornly unwilling to work with Creator/BigFinish.[[/note]]. The "Doctor Who Unbound" series of WhatIf stories also began that year.
*** ''Doctor Who Magazine'' comics: "The Land of Happy Endings", which revisits the settings and characters of the TV Comic strips via AllJustADream.
*** Novels: The Literature/PastDoctorAdventures novel ''Deadly Reunion'', penned by Third Doctor era architects Barry Letts and Terrance Dicks. The first half of it tells the early years of the Brigadier before meeting the Doctor.
*** Other: The animated webcast ''WebAnimation/ScreamOfTheShalka'', which was intended to be the official revival of the series. The above announcement reduced it to an non-canon AlternateUniverse tale.
** 45th anniversary (2008): The show itself (which was revived by then) did nothing explicitly celebratory, but that didn't stop the Expanded Universe any.
*** Big Finish Doctor Who: "[[Recap/BigFinishDoctorWho115FortyFive Forty-Five]]", a Seventh Doctor audio anthology where the number 45 is littered everywhere. There is an in-universe rationale in the last story for that.
*** {{Creator/IDW|Publishing}} comics: "The Forgotten", which featured an amnesiac Tenth Doctor flashing back to all of his previous incarnations in order to regain his memories.
** Subtly done for the 200th story, [[Recap/DoctorWhoS30E15PlanetOfTheDead "Planet of the Dead"]] (2009), which features a number 200 bus, which the Doctor refers to as "The mighty 200!"
** For Franchise/BerniceSummerfield's 20th birthday (2012), she had the charity special audio play ''Many Happy Returns'', which brings back a number of characters ''and'' writers, and an audio adaptation of her debut Literature/DoctorWhoNewAdventures novel ''Love and War''.
** 50th anniversary (2013):
*** TV: "[[Recap/DoctorWho50thASTheDayOfTheDoctor The Day of the Doctor]]" and its associated prequels "[[Recap/DoctorWho50thPrequelTheNightOfTheDoctor The Night of the Doctor]]" and "[[Recap/DoctorWho50thPrequelTheLastDay The Last Day]]", a WhamEpisode ReunionShow that aired 50 years to the day of the show's premiere and laid down a new plot strand for the Doctor to follow in the next 50 years to come; "Film/AnAdventureInSpaceAndTime", a docudrama about the creation of the show, and "[[Recap/TheFiveishDoctorsReboot The Five(ish) Doctors Reboot]]", a parody ReunionShow short feature.
*** Big Finish Doctor Who: The Big Finish continuity was made a CanonImmigrant thanks to a line of dialogue in "The Night of the Doctor". For the celebratory audio plays, there was "[[Recap/BigFinishDoctorWhoSpecialsTheLightAtTheEnd The Light at the End]]", a classic series-style ReunionShow; "[[Recap/BigFinishDoctorWhoCCS8E5TheBeginning The Beginning]]", which tells the tale of the TARDIS's first flight; "Destiny of the Doctor", a series of CrossThrough audiobooks involving the then-Eleven Doctors (and also the only time Big Finish has been able to outright use new series elements), and the thematic 1963 trilogy of "[[Recap/BigFinishDoctorWho1781963FanfareForTheCommonMen 1963: Fanfare for the Common Men]]" (which is pretty much a BrickJoke to a background element in [[Recap/DoctorWhoS1E1AnUnearthlyChild the first episode]]), "[[Recap/BigFinishDoctorWho1791963TheSpaceRace 1963: The Space Race]]" and "[[Recap/BigFinishDoctorWho1801963TheAssassinationGames 1963: The Assassination Games]]".
*** Novels: A series of 11 ebook short stories for each of the then-Eleven Doctors published by Puffin Books. BBC Books also saw fit to reissue a number of Literature/PastDoctorAdventures novels.
*** ''Doctor Who Magazine'' comics: "Hunters of the Burning Stone", which saw the Eleventh Doctor reunited with the very first companions, Ian and Barbara, in a battle against an unexpected old foe, and "John Smith and the Common Men", published on the anniversary month of November 2013.
*** IDW comics: ''ComicBook/DoctorWhoPrisonersOfTime'', where an unexpected newer foe is disrupting the Doctor's timeline by removing his companions from his timestream. On a somber note, IDW's ''Doctor Who'' contract ran out that year.
*** Other: A ''Doctor Who'' game adorned Website/{{Google}}'s home page on November 22, 2013.
** 10th anniversary of TV revival (2015):
*** [[ComicBook/DoctorWhoTitan Titan Comics]] published ''ComicBook/DoctorWhoFourDoctors'', a five-part miniseries crossing over their Tenth, Eleventh, and Twelfth Doctor titles and throwing in the War Doctor, [[spoiler: an evil alternate universe Twelve as the Big Bad]], ''and'' [[spoiler: a cameo by Nine]] for good measure.
*** While the show itself didn't acknowledge this anniversary, Series 9 ''was'' heavy on return appearances by fan-favorite characters, a prologue short saw the return of Ohila from "The Night of the Doctor", and two stories followed on from "The Day of the Doctor"'s events -- "The Zygon Invasion"/"The Zygon Inversion" is a direct sequel to its B-plot, and the three-part finale "Face the Raven"/"Heaven Sent"/"Hell Bent" had [[spoiler: the Doctor returning to Gallifrey for the first time since the Time War/the revival's debut]] as one of several WhamEpisode events.
* ''Franchise/{{Transformers}}'' has had quite a few of these:
** The UK version of the Marvel ''Comicbook/TheTransformers'' comic, due to a quirk of publishing, ended up with over four times as many issues as the US comic. Issues 100 (1987), 200 (1989), and 300 (1990) all featured wraparound covers and double-length stories.
*** Issue 50 of the US comic featured [[TheStarscream Starscream]] wiping out a large chunk of the cast before biting the dust himself. This was done to pare down the LoadsAndLoadsOfCharacters, though many of them (including Starscream himself) would be [[BackFromTheDead brought back]] (most, but not all, being due to [[MerchandiseDriven new toys]], of course).
*** Issue 75 saw the big battle against [[EldritchAbomination Unicron]]. Unsurprisingly, there were many more casualties.
** 20th Anniversary (2004):
*** Toys: A ''huge'' transformable figure of Optimus Prime, complete with his trademark gun, laser axe, a miniature Megatron in gun mode, and of course, the Matrix of Leadership.
*** ''Anime/TransformersEnergon'' had the episode "Distribution" being the 500th episode of ''Transformers'' to be shown on Japanese TV. It was a [[BizarroEpisode weird, pointless]] episode that spoofed ProfessionalWrestling.
** ''WesternAnimation/BeastWars'' 10th Anniversary (2006): a rerelease of several figures along with two new figures of Optimus Primal and Megatron. All the toys had pieces which could be used to build Trans-Mutate.
** WesternAnimation/{{Transformers Energon}} was supposed to be the huge 20th anniversary series. Results, though, were....''mixed'', to be polite. Animation errors, inconsistent naming, character de-evolution, an ''extreme'' focus on selling toys, fluctuating art and animation, bad editing and awful dubbing were all common for ''Energon''. The only remaining awesome factor of ''Energon'' from its Japanese counterpart (''Super Link'') was the music...and not even the ''toyline'' was safe, because that also carried over the flaws of the ''Armada'' toyline.
** 25th Anniversary (2009):
*** Toys: The original Optimus Prime toy was rereleased with the inclusion of a DVD of the first three episodes of [[WesternAnimation/TheTransformers the original series]] and a copy of the first issue of [[Comicbook/TheTransformers the Marvel comic book]]. Also, new toys were produced based on characters from throughout the franchise, from G1 to ''TransformersArmada''.
*** The airing of ''TransformersAnimated'' (2007-2009) coincided with this period. It celebrated by paying {{homage}} to every single ''Transformers'' incarnation previously made, even the obscure ones that were barely even released in Japan and not at all outside. Granted, many of those nods and references were AllThereInTheManual, but that said, the manuals (that is, the ''Allspark Almanac'', volumes 1 and 2) are extensive and full of {{Mythology Gag}}s.
** 30th Anniversary (2014): Both Hasbro and [=TakaraTomy=] are featuring 30th Anniversary lines (Hasbro dubbing theirs "Thrilling 30", which began with releases in fall 2013).
*** ''Film/TransformersAgeOfExtinction'' was released, marking the beginning of an expected second film trilogy.
*** The sequel series to ''WesternAnimation/TransformersPrime'' was announced, though it won't debut until 2015. The new series is named ''Transformers: Robots in Disguise'' (though the name was [[NamesTheSame previously used]] for the English dub of ''[[Anime/TransformersRobotsInDisguise Car Robots]]'' in 2001, not to mention one of [=IDW=]'s [[ComicBook/TheTransformersRobotsInDisguise ongoing comic books]]).
*** The [[Creator/IDWPublishing IDW]] series's mega-event ''[[ComicBook/TheTransformersDarkCybertron Dark Cybertron]]'' and the follow-up in the ongoing series, ''Dawn of the Autobots'', which includes the ''[[ComicBook/TheTransformersWindblade Windblade]]'' miniseries. Windblade herself was the culmination of a fan poll for the creation of a new character.
*** Toys: the ''Generations'' toyline features characters from non-G1 continuities (such as [[WesternAnimation/BeastWars Rattrap, Waspinator]], [[WesternAnimation/BeastMachines Tankor]], ''[[Anime/TransformersArmada Armada]]'' Starscream, and ''[[VideoGame/TransformersFallOfCybertron Fall of Cybertron]]'' Skywarp) who are represented in the [=IDW=] continuity (with their Hasbro figures including reprints of ''Dark Cybertron'' chapters). Hasbro debuted Masterpiece Soundwave to open the ''Thrilling 30'' toyline, along with Acid Storm (an MP-11 Starscream redeco), and is reissuing MP-10 Optimus Prime (in a special "Year of the Horse" deco) and Grimlock, and debuting Prowl. Takara issued MP [[Anime/TransformersHeadmasters Soundblaster]] with Ratbat, and will be issuing MP versions of Wheeljack, Bumblebee (with [[WesternAnimation/TransformersTheMovie Spike in his exosuit]]), Ultra Magnus, and [[Anime/TransformersVictory Star Saber]].
* Creator/WarnerBros and Creator/DCComics [[http://www.dccomics.com/blog/2014/03/27/warner-bros-entertainment-and-dc-entertainment-celebrate-batmans-75th-anniversary had a lot on the plate]] across a number of their branches for the 75th anniversary of ''Franchise/{{Batman}}'' in 2014:
** Real world: July 23, 2014 was pegged down by DC as "Batman Day", where a number of comic stores hosted ''Batman'' celebrations.
** Comics: ''Detective Comics'' Vol. 2 #27, a 85-page short story anthology issue featuring, among other things, a remake of the original ''Detective Comics'' Vol. 1 #27 that introduced Batman to the world, and the launch of the year-long weekly series ''ComicBook/BatmanEternal''.
** Film: A 25th anniversary home video release of [[Film/{{Batman}} the 1989 film]] and the beginning of shooting of ''Film/BatmanVSupermanDawnOfJustice''.
** Television: The rescue of [[Series/{{Batman}} the Adam West series]] from KeepCirculatingTheTapes purgatory and the debut of production of the ''Series/{{Gotham}}'' TV series.
** Animation: Two animated short features produced by Creator/BruceTimm and Darwyn Cooke and the animated films ''WesternAnimation/SonOfBatman'' and ''WesternAnimation/BatmanAssaultOnArkham''.
** Video games: ''VideoGame/BatmanArkhamKnight'' was supposed to fill this role, but it got delayed to 2015. Also, a {{UsefulNotes/Steam}} sale on the rest of the ''VideoGame/BatmanArkhamSeries'' on the exact anniversary weekend of March 28-30.
* For the 30th anniversary of the ''Franchise/BackToTheFuture'' franchise in 2015[[note]]Most of these took place during the month of October since October 21st, 2015 was when ''Part II'' took place.[[/note]]:
** Pepsi released the [[https://www.youtube.com/watch?v=XrwRdzFP-fY Pepsi Perfect]], designed exactly as it appears in ''Part II''. Only 6500 units were made.
** ''Back to the Future: The Complete Animated Series'' was released on DVD for the first time, in its entirety and uncut. In addition, a "30th Anniversary Trilogy" CompilationRerelease of the movies was released on DVD and Blu-Ray, along with [[LimitedSpecialCollectorsUltimateEdition The Complete Adventures]], which includes the previously mentioned [=DVDs=] and a replica flux capacitor.
** In October 21st, the movies came back to cinemas for one day only.
** Microsoft celebrated the occasion by including an interesting EasterEgg in its website, where typing in the words "OUTATIME" would pop up the [=DeLorean=] flux capacitor, followed by a video of clouds, wherein a flashing of lights are shown, an indication that something is coming, just like how it was portrayed in the movies. The page that is displayed afterwards shows the phrase "Great Scott! The future is precisely on schedule", a reference to one of Doc Brown's lines; the page also displays many of Microsoft's current hardware--[=HoloLens=] (VR), Lumia (smartphone), Band (fitness tracker), Surface (tablet/two-in-one laptop) and XboxOne--showcased side-by side with corresponding technologies from TheEighties (as an added bonus, the page can be viewed in 3D, if you have the appropriate glasses).
** Telltale Games rereleased the [[VideoGame/BackToTheFuture video game]] for the {{Xbox 360}}, UsefulNotes/XboxOne and UsefulNotes/PlayStation4, with improved textures, new dialogue and interviews with various staff involved with the game and the films, including the films' co-writer and producer. {{UsefulNotes/Steam}} also had a 75% discount on the game on October 21st, as part of one of its Daily Deals.
** ''VideoGame/RocketLeague'' added the franchise's iconic [=DeLorean=] as DownloadableContent--complete with 'burnt rubber' Rocket Trail.
** ''VideoGame/JetpackJoyride'' added a brand new mode, which has Barry looking like Marty [=McFly=] (Doc Brown and Biff Tanner's looks are unlockable), the set is the 2015 Hill Valley from ''Part II'', the jetpack is the 1985 guitar, and the available vehicles are the Flying Skateboard (which gives you a double jump) and the franchise's iconic [=DeLorean=] (which gives you a ''huge'' boost when it goes over 88). In this mode, hitting hazards does not immediately kill you, instead, you are {{timed|Mission}}: powerups scattered on the playing field add 5 seconds to your time, and getting hit removes 10 seconds.
** ''VideoGame/LittleBigPlanet 3'' gained a Back to the Future inspired campaign for its first {{DLC}}, which has Sackboy following Marty [=McFly=] and Doc Brown in a recreation of the first movie. Two costume packs are also available.
** ''Wild Gunman'' was released on the VirtualConsole. This is important when you realize that Marty played this very game in ''Part II''.

[[folder:Fan Fic]]
* ''Fanfic/CalvinAndHobbesTheSeries'' has an in-universe example in "The Case of the Rogue Water Balloon", wherein G.R.O.S.S. celebrates its second anniversary and its 500th water balloon attack.
* A significant chapter of ''FanFic/MegaManReawakened'' was posted just before the fic's second anniversary.
* ''Fanfic/TheBridge'''s second anniversary featured an animated Q&A video. Unfortunately, it was released a month late due to technical difficulties.

[[folder:Films -- Animated]]
* ''Disney/{{Tangled}}'' has a LogoJoke for the Disney Animation VanityPlate proclaiming the film as being the 50th movie in the Franchise/DisneyAnimatedCanon.
* Creator/{{Pixar}}
** ''WesternAnimation/{{Cars}}'' came out during Pixar's 20th anniversary. To commemorate this, the Pixar logo fades into "Celebrating 20 Years" written against a black background, with Luxo Junior's light bulb forming the zero in the 20.
** ''WesternAnimation/{{Cars 2}}'' celebrated Pixar's 25th anniversary with a CreatorCameo of Pixar head John Lasseter. (It also introduced [[BrokenStreak an uncelebratory first for Pixar]][[note]]It was Pixar's first, and so far only, film to be rated as "Rotten" on Rotten Tomatoes[[/note]], but that's neither here or there.)
** ''WesternAnimation/TheGoodDinosaur'' marks 20 years of Pixar's theatrical films, though it misses the milestone by a few days[[note]]''Dinosaur''[='=]s release is on November 25, 2015, three days after the anniversary of the release of their first film, ''WesternAnimation/ToyStory'', on November 22, 1995[[/note]].
** ''WesternAnimation/FindingDory'' will be released in the year of Pixar's 30th anniversary.
** For individual films, on December 10, 2015 Creator/{{ABC}} commemorated the 20th anniversary of ''WesternAnimation/ToyStory'' with a retrospective special entitled ''Toy Story at 20: To Infinity And Beyond'', featuring new interviews with the cast and crew. This was followed by a showing of the original ''Toy Story'' itself.

[[folder:Films -- Live-Action]]
* Movie studios often get updated {{Vanity Plate}}s on their anniversaries. Movies released during the first year of the updated logos also contain messages denoting the anniversary. (eg, ''Film/TheVoyageOfTheDawnTreader'' in 2010 begins by panning up from the Creator/TwentiethCenturyFox structure to some lights spelling out, "Celebrating 75 Years"[[note]]Referring to the 1935 merger of the Fox Film Corporation and Twentieth Century Pictures, not the 1915 founding of the Fox Film Corporation. On that note, the updated Fox logo actually debuted one month before the anniversary year began, without the 75 years message, in front of December 2009's ''Film/{{Avatar}}''.[[/note]].)
** Creator/{{Universal}} celebrated its 75th anniversary[[note]]referring to the 1925 re-branding as Universal Pictures Company, Inc., not the 1912 founding of Universal Film Manufacturing Company[[/note]] by opening each movie released in 1990 with the logos that graced their works from 1927-1990, and a then-new logo (though they skipped the version that refers to them as Universal International). Fittingly, this montage first appeared at the beginning of ''Film/BackToTheFuturePartIII''.
*** Universal released a similar video for their 100th anniversary[[note]]referring to the 1912 founding of Universal Film Manufacturing Company[[/note]], preceding another new logo with the ones used from 1927-2012 (they did not exclude the Universal International ident this time), but showed this montage online instead of during movies.
* Anniversaries are generally a good excuse for LimitedSpecialCollectorsUltimateEdition video releases of beloved films, dating back to the VHS era.
* ''Film/JamesBond''
** ''Film/DieAnotherDay'' marked both the 20th ''Bond'' film and the 40th anniversary of the film series, and as a result was rife with {{Mythology Gag}}s and {{Continuity Nod}}s. It was supposed to have a Creator/SeanConnery [[PreviousPlayerCharacterCameo cameo]].
** ''Film/{{Skyfall}}'' commemorated the 50th anniversary of the ''Bond'' films with a bunch of {{Mythology Gag}}s (one of which gets some importance in the final battle) and a status quo change for Creator/DanielCraig's Bond. It also considered having a Creator/SeanConnery [[PreviousPlayerCharacterCameo cameo]] but the director felt that Connery appearing as not Bond felt wrong.
* It's very common for superhero films to be released during special anniversaries of the characters they're adapting:
** The original ''Film/{{Superman}}'' movie was released in 1978, celebrating the 40th anniversary of Franchise/{{Superman}}'s debut in ''ComicBook/ActionComics'' #1 (June 1938). ''Film/ManOfSteel'' was released in June 2013, his 75th anniversary.
** The first ''Film/{{Batman}}'' movie was released in 1989 in time for the 50th anniversary of Franchise/{{Batman}}'s first appearance in #27 of Detective Comics.
** The first ''Film/SpiderMan1'' film was released in 2002 for [[Franchise/SpiderMan Spidey's]] 40th anniversary, ''Film/SpiderMan3'' was released in 2007 for the 45th, and the reboot ''Film/TheAmazingSpiderMan'' was released in 2012, ten years after the original film, for the 50th.
** The first ''Film/{{Hellboy}}'' movie was released in Spring 2004, on the 10th anniversary of ComicBook/{{Hellboy}}'s first appearance in comics (''Dime Press'' #4, March 1994).
** ''Film/CaptainAmericaTheFirstAvenger'' was released in 2011 celebrating the 70th anniversary of ComicBook/CaptainAmerica's first appearance in 1941, with ''Film/CaptainAmericaCivilWar'' coming out in 2016, in time for his 75th. The latter also loosely adapts the ''ComicBook/CivilWar'' miniseries on the 10th anniversary of its 2006 debut, and features the feature film debut of ComicBook/BlackPanther, 50 years after his first appearance in 1966.
** ''Film/IronMan3'' was released in 2013, 50 years after ComicBook/IronMan's first appearance in ''Tales of Suspence'' #39 back in 1963.
** ''Film/{{Deadpool}}'' was released in 2016, 25 years after [[SelfDemonstrating/{{Deadpool}} the character's]] first appearance in ''New Mutants'' #98 in 1991.
** 2016's ''Film/BatmanVSupermanDawnOfJustice'', similar to ''Civil War'', marks the live-action film debut of ComicBook/WonderWoman, 75 years after her debut in ''All-Star Comics'' #8 back in 1941.
* ''Franchise/StarTrek'':
** ''Film/StarTrekVITheUndiscoveredCountry'' was released to celebrate the 25th anniversary of ''Series/StarTrekTheOriginalSeries'' as a GrandFinale that reunited the entire original cast one last time and ended the conflict with their old arch-enemies, the Klingons.
** ''Film/StarTrekFirstContact'' was released during the franchise's 30th anniversary, which was also being celebrated by the two TV series on air at the time(seen below in the TV section). The film sees the [[Series/StarTrekTheNextGeneration Next Generation crew]] go back in time to stop the Borg from changing history [[spoiler: and as a result shows humanity's [[TitleDrop first contact]] with the Vulcans, pretty much serving as the major starting point of Trek history.]]
** ''Film/StarTrekBeyond'' is being released in 2016, to celebrate the franchise's 50th anniversary.
* ''Franchise/{{Godzilla}}'' has had several since the [[Film/{{Gojira}} first movie]], which have featured {{Retool}}s, {{Continuity Reboot}}s and/or {{Grand Finale}}s for whichever series of films Creator/{{Toho}} was working on.
** ''Film/MothraVSGodzilla'' was the 5th anniversary, and the first movie to cross two Toho properties (''Film/KingKongVsGodzilla'' was the first film to cross Godzilla over with another movie monster, but of course Kong isn't a Toho property[[note]]It is worth noting that ''Film/KingKongVsGodzilla'' was Toho's 30th birthday movie though.[[/note]]). Interestingly enough, ''Film/MothraVSGodzilla'' and ''Film/GhidorahTheThreeHeadedMonster'' were produced pretty much right in succession.
** ''Film/GhidorahTheThreeHeadedMonster'', the 10th anniversary film, was the first time Godzilla teamed up with other {{Kaiju}} and the first time he was portrayed as defending humanity. As another note, this was also the first film to cross over more than two Toho kaiju; crossing over a total of ''three'' [[Film/{{Gojira}} different]] [[Film/{{Mothra}} kaiju]] [[Film/{{Rodan}} movies]]; a record of which wouldn't be broken until 1968's ''Film/{{Destroy All Monsters}}''.
** The original [[RobotMe Mechagodzilla]] duology (''Film/GodzillaVsMechagodzilla'' and ''Film/TerrorOfMechagodzilla''), for the 20th anniversary, removed many of the LighterAndSofter elements that made the immediately preceding films so disliked while also concluding the Showa series.
** ''Film/TheReturnOfGodzilla'', as its name implies, brought Godzilla back for the 30th anniversary along with better special effects and a DarkerAndEdgier tone.
** ''Film/GodzillaVsDestoroyah'', the 40th anniversary film, ended the Heisei series by having Godzilla fight a monster with origins related to the Oxygen Destroyer that killed him in the original film and then killing Godzilla off again; the film even ended with a brief montage of clips from the first film.
** ''Film/GodzillaFinalWars'' ended the Millennium series on the 50th anniversary by having Godzilla fight and kill almost every other monster he had ever faced.
** ''Film/{{Godzilla 2014}}'' was released 60 years after the original film (though it's 6 months too early to be an ''exact'' anniversary). The months before the movie came out saw a promotional toy fair that featured models of the numerous designs of Godzilla and other monsters over the course of the franchise, along with a limited theatrical run of [[Film/{{Gojira}} the original 1954 film]]. Ironically, it was also released just a month too late to celebrate the 40th anniversary of ''Film/MothraVSGodzilla'' (which was released in April of 1964).
* Warner Bros. did a limited theatrical reissue of ''Film/WillyWonkaAndTheChocolateFactory'' to mark its 25th anniversary in 1996, and the soundtrack was finally given a CD release. When the film hit 30 in 2001, it received a special edition DVD release (as opposed to the previous VanillaEdition) that brought back many cast and crew members for its special features, and a making-of book (''Pure Imagination''). For the 40th anniversary in 2011, they went the full LimitedSpecialCollectorsUltimateEdition route with a Blu-Ray package that included the previous disc's bonus features, the book, and a few other physical extras.

* The ''Literature/MrMen'' and ''[[DistaffCounterpart Little Miss]]'' books celebrated their 35th (''Mr. Men'') and 25th (''Little Miss'') anniversaries with [[ExactlyWhatItSaysOnTheTin "Mr. Birthday" and "Little Miss Birthday"]].
* The 1111th and the 2222nd volume of the long-running weekly German SciFi series ''Literature/PerryRhodan'' were both quite nice in-character and in-continuity parodies of the series, both written by Horst Hoffmann, who went on to announce his retiring from being a regular author.
* ''SweetValleyHigh'' celebrated its 100th book (well, actually its 97th through 100th) with its first StoryArc, a GenreShift to horror. It worked surprisingly well, leading to more story arcs and more fantastical story elements in the future.
* ''Return to Firetop Mountain'' celebrated both the 50th installment in the ''Literature/FightingFantasy'' series and the tenth anniversary of the publishing of the first book. It took the reader back to the same dungeon of the original ''The Warlock of Firetop Mountain'' to defeat a resurrected Zagor.
* Pan Books commissioned ''Literature/AndAnotherThing'' for the 30th anniversary of the publication of ''Literature/TheHitchhikersGuideToTheGalaxy1''.
* The tenth anniversary of ''Literature/WarriorCats'' in 2013 marks the release date of the prequel series ''Literature/WarriorCatsDawnOfTheClans''.
* ''Literature/CharlieAndTheChocolateFactory'''s 50th anniversary in 2014 ("50 Whipple-Scrumptious Years") was marked with a variety of events and offerings. This milestone celebration specifically kicked off on January 31st, since that's the day Charlie finds his Golden Ticket in the novel.
** Penguin Books added the novel to their adult-oriented Penguin Modern Classics line -- a ploy that went awry due to its unique, controversial ContemptibleCover featuring a girl with UncannyValley makeup and dress.
** The novel had several kid-friendlier anniversary editions published too, including deluxe reissues of both the Joseph Schindelman ''and'' Quentin Blake-illustrated editions -- the latter in full-color for the first time.
** The retrospective book ''Inside Charlie's Chocolate Factory'' was published.
** There were contests in the U.S. and U.K., and the annual Puffin Virtually Live school webcast that marks Creator/RoaldDahl's birthday was centered on the book.
** While the [[Theatre/CharlieAndTheChocolateFactory 2013 West End stage musical adaptation of the novel]] was not specifically launched to tie in to the anniversary, it was incorporated into several of the U.K.-based events, such as the aforementioned webcast and an Easter-season window display at the Piccadilly Circus Waterstone's bookstore that recreated its sets and characters in miniature via decorated chocolate biscuits. "Celebrate Fifty Years of [[BootstrappedTheme Pure Imagination]]" was a tagline for the show for a while too.
* ''Literature/JamesBond'' novel ''Literature/DevilMayCare'' was released on the hundreth anniversary of the birth of Creator/IanFleming, the creator of the character.
* ''Life and Death'', a GenderFlip[=ped=] retelling of ''Literature/{{Twilight}}'', was released in celebration of the 10th anniversary of ''Twilight''.

[[folder:Live-Action TV]]
* GameShows are no stranger to this trope.
** ''Series/WhatsMyLine'': To celebrate its 25th anniversary as a series in 1975, a special two-hour retrospective of the panel game, wherein four panelists sought to identify someone's occupation or other secret, aired on ABC Late Night. It was interesting in a number of respects when it aired in late May: 1. Virtually all of the footage (except for a clip introducing then-sitting President GeraldFord) came from the original 1950-1967 CBS run; 2. The special was hosted by original host John Daly (who was not present at all during the syndicated run), although Arlene Francis and co-creator Mark Goodson were there; and 3. The syndicated version, which had been airing since 1968, was about to wrap up its successful seven-year run. Still, it was a nice way to celebrate television's then-longest running game show, which was a constant presence for most of the past quarter century.
** ''Series/WheelOfFortune'': The 3,000th and 4,000th episodes were special retrospective episodes, featuring some of the key highlights of the (syndicated) series. The 3,000th program aired in 1998, and the 4,000th sometime in 2003. A rare photograph, printed in Jefferson Graham's "The Game Show Book," showed Vanna and Pat at the puzzle board to promote the daytime series' 3,000th episode, aired sometime in the fall of 1986.
** ''Series/ThePriceIsRight'': With the ceremonial 5,000th episode (in the spring of 1998), Studio 33 (where the show taped) was renamed the Bob Barker Studio. The 6,000th and 7,000th episodes have all featured increased prize budgets and other pomp and circumstance.
** ''Series/{{Jeopardy}}'':
*** The original version aired its 2,000th episode in early 1972. In place of Final Jeopardy! was a performance by Mel Brooks' 2000-Year-Old Man character. Various other special episodes and tournaments have cropped up during the course of the Trebek version.
*** For the Trebek version's 3,000th episode, the opening round featured the same categories used in Trebek's premiere (with new clues), Double Jeopardy! featured special categories worked around the milestone, and the Final Jeopardy! category was "Holidays", the same as the first episode.
** ''Series/LetsMakeADeal'' celebrated being on air for 50 years in early 2013 by having Monty Hall himself and his assistant taking over for one of the deals.
* Creator/BobHope: Various shows marked one of his landmark anniversaries or birthdays, starting with "A Quarter Century of Bob Hope on Television" in October 1975. Birthday celebrations for his 75th, 80th and 90th birthdays aired in 1978, 1983 and 1993, respectively. Many of these shows featured [[ClipShow clips]] from previous specials, along with pre-taped well wishes from his friends, often the sitting president at the time and the casts of various TV shows.
* ''Series/AllInTheFamily'': The 100th and 200th episodes of the series were [[ClipShow Clip Shows]], but not in the traditional sense of wrapping a "recalling old times" storyline around past clips. Rather, these were special guest stars – Henry Fonda for the 100th show, in December 1974, and Norman Lear for the 200th show (from March 1979) – providing commentary, narrating clips and introducing interview excerpts from the main cast members. A 20th anniversary special also aired in 1991, featuring retrospectives from cast members and ordinary people who agreed to be interviewed for the special.
* ''Series/HappyDays'': The series' first "milestone" show came just two years into its run, titled – inventively enough – "Second Anniversary Show," and was simply Fonzie and the family laughing about past adventures. Two more "anniversary milestone" shows – titled "Third Anniversary Show" (Howard and Marion celebrating their anniversary) and "Fourth Anniversary Show" (Lori Beth writing a paper about the Cunninghams, an "average middle-class American family") – aired in 1977 and 1978, respectively.
* ''Series/LittleHouseOnThePrairie'': To celebrate its fifth anniversary as a series, NBC decided to celebrate one of its rare (at the time) series hits with a special three-hour movie, "The Little House Years." This was simply extended highlights from seven of the most popular episodes of the series framed around the Ingalls celebrating Thanksgiving dinner. Although shown independently of the series, and not usually shown in syndication order with the rest of the episodes, it is canon within the TV ''Little House'' universe. [[note]]In addition to drawing great ratings, "The Little House Years" was an effective plug for the newly syndicated ''Little House''.[[/note]]
* ''Series/TheTonightShow'': To celebrate Johnny Carson's 10th anniversary of hosting the show, a prime-time special aired, including highlights from his first decade of the show and special guests. Clips were rather limited due to much of the archives being wiped (due to reuse of videotape), although kineoscopes and video of highlights from the 1960s through early 1970s (e.g., Ed Ames' tomahawk throw, a parody of ''Franchise/{{Dragnet}}'', Tiny Tim's wedding) were shown. After then, the specials began airing annually (e.g., "Tonight Show Starring Johnny Carson 17th Anniversary Special" in 1979) until the last one aired in 1991. As the years progressed, more clips were aired since all shows produced after sometime in 1972 exist.
* ''Franchise/StarTrek'':
** The franchise celebrated 30 years with ''Series/StarTrekDeepSpaceNine'' and ''Series/StarTrekVoyager'' doing special episodes that referred back to the original crew. ''Deep Space Nine'' did a revisioned look at the events of the ''Series/StarTrekTheOriginalSeries'' episode "The Trouble With Tribbles" via TimeTravel, and ''Voyager'' also did a TheGreatestStoryNeverTold with what Captain Sulu did during the majority of the events of ''Film/StarTrekVITheUndiscoveredCountry''. The reason why ''Voyager'' had one featuring Sulu was that "The Trouble With Tribbles" was one of several Season 2 episodes to not feature Sulu (thanks to Creator/GeorgeTakei filming ''The Green Berets'') and it just seemed strange to not include the character somehow in the 30th anniversary...
** ''Series/StarTrekVoyager'''s 100th episode, "Timeless", featured the destruction of Voyager with only two survivors from a botched attempt to return home. Harry and Chakotay used TimeTravel to SetRightWhatOnceWentWrong, which made them fugitives of Starfleet. Adding to the occasion was guest star [[Series/StarTrekTheNextGeneration LeVar Burton]], who also directed the episode.
** ''Series/StarTrekTheNextGeneration'''s 80th episode, "Q-Pid", which surpassed TOS' total of 79, had the ''Enterprise'' be forced to bypass a scheduled stop at the planet where the TOS finale took place.
* The 100th episode of ''Series/BuffyTheVampireSlayer'' coincides with the fifth-season finale, in which Buffy dies (for the second time). "The Gift" additionally was the last Buffy episode to air on The WB network before the series moved to UPN in September 2001.
** The episode began with a PreviouslyOn segment that contained clips from ''every single previous episode'', all going by at very high speed.
** The canon Season 8 comics that continued the story were coincidentally released on the 10th anniversary of the first season.
* In ''Series/{{Angel}}'s'' 100th episode, "You're Welcome", Cordelia awoke from her mystical coma and reinvigorated Angel's fighter spirit. [[spoiler:And it was [[DeadAllAlong revealed]] that she [[BackForTheDead had died]].]]
* ''Franchise/PowerRangers'' celebrated 10 years with "Forever Red" in ''Series/PowerRangersWildForce''. 10 years of Red Rangers returned for a fight that crosses over into several past seasons. They did 15 years with "Once A Ranger" in ''Series/PowerRangersOperationOverdrive'', which had some of the more popular (non-Red) Rangers return for another fight.
** ''Power Rangers''' 500th episode (during the ''[[Series/PowerRangersDinoThunder Dino Thunder]]'' season) was a big ClipShow showcasing most of the series. It also moved the story forward a bit, as the Dino Rangers finally found out that their teacher and mentor, Tommy Oliver, was a veteran Power Ranger (the [[Series/MightyMorphinPowerRangers very first]] SixthRanger, and Red Ranger to the [[Series/PowerRangersZeo following]] [[Series/PowerRangersTurbo couple]] teams). The very next episode saw Tommy climb back in the saddle as the Black Dino Ranger.
** And in a bit of fortuitous timing, the final Disney season before Saban claimed the franchise back, ''Series/PowerRangersRPM'', ends with the 700th total episode.
** ''Series/PowerRangersMegaforce'' celebrates the show's 20th anniversary. It's running two years; the first year is a bit of a homage to the original ''Series/MightyMorphinPowerRangers'' and the second is a franchise-wide CrisisCrossover. (The two-year thing is due to scheduling quirks on the part of both Creator/{{Disney}}[[note]]who skipped a year when they had the series[[/note]] and Creator/{{Nickelodeon}}[[note]]who cut episode counts per season in half, forcing each incarnation to stretch over two years[[/note]]; the adaptation of ''Sentai''[='=]s milestone crossover season was going to miss the anniversary year, so it and the prior year was made one big storyline.)
* On the other side of the Pacific, in 2006 ''Franchise/SuperSentai'' celebrated its 30th series in ''Series/GoGoSentaiBoukenger'' with the after-show segment "The 30 Sentai Encyclopedia", short skits hosted by the Boukengers briefly reviewing every show and every first over the past 30 years, as well as shared themes between shows. There was also the {{Crossover}} ReunionShow, featuring the physical manifestation of the 30 Years of Sentai in [=AkaRed=], who had the power of all the past Red Rangers combined, along with a Ranger from the [[Series/NinpuuSentaiHurricaneger previous]] [[Series/BakuryuuSentaiAbaranger four]] [[Series/TokusouSentaiDekaranger Sentai]] [[Series/MahouSentaiMagiranger series]], AND a villain from [[Series/HyakujuuSentaiGaoranger the one before those.]]
** Before that, ''Series/KousokuSentaiTurboranger'' was launched as the then-eleventh show (tenth anniversary) of ''Franchise/SuperSentai''. Its first episode was a special ClipShow that summarized the previous ten shows and featured 53 ''Sentai'' heroes in costume (which seems a modest number nowadays, when the first episode of ''Gokaiger'' had almost four times that amount). Interestingly, Toei decided to add [[Series/HimitsuSentaiGoranger two]] [[Series/JAKQDengekitai previous]] shows into the canon later on, making the Turboranger officially the thirteenth. The only reason they weren't included before was they lacked the HumongousMecha.
** There was also a 25th anniversary team-up movie featuring the ''Series/HyakujuuSentaiGaoranger'' teaming with five Super Sentai members from [[Series/JAKQDengekitai pa]][[Series/ChoujuuSentaiLiveman st]] [[Series/DenjiSentaiMegaranger se]][[Series/SeijuuSentaiGingaman ri]][[Series/RescueSentaiGoGoFive es]].
** On a smaller note, the 15th [[ReunionShow reunion movie]], ''Series/EngineSentaiGoOnger vs. [[Series/JukenSentaiGekiranger Gekiranger]]'', saw a theatrical release instead of being DirectToVideo for being number 15; acknowledged in the movie's ending when the heroes celebrate a birthday party, and calling it "a Super Sentai birthday". Then theatrical releases for reunion movies became the norm.
** ''Series/KaizokuSentaiGokaiger'', the 35th series, is ''Super Sentai'''s equivalent to ''Series/KamenRiderDecade'', with the heroes channeling powers and mecha of previous Ranger teams. Previous Rangers themselves also make guest appearances. In a nod to the previous anniversary, [=AkaRed=] was the one who gave them their powers. They also had [[Film/KaizokuSentaiGokaigerVsSpaceSheriffGavanTheMovie a crossover movie]] with one of Toei's other heroes, Series/SpaceSheriffGavan, who himself was celebrating his 30th anniversary. And shortly after ''Gokaiger'' ended, Toei launched the ''Superhero Taisen'' series that crossed ''Sentai'' over with ''Franchise/KamenRider'', with Gokaigers vs. Decade as the plot of [[Film/KamenRiderXSuperSentaiSuperheroTaisen the first film]] (Toei [[http://www.jefusion.com/2011/12/kamen-rider-vs-super-sentai-super-hero.html denies that it's an intentional Milestone Celebration]], but with the timing and characters involved it fits too well to not be one).
** In 2015, ''Series/ShurikenSentaiNinninger'' celebrated 40 years since the debut of ''Super Sentai'' with ''Series/HimitsuSentaiGoranger'' in 1975 by having two special guest stars in Episode 7: the two Red Rangers of the past ninja series, ''Series/NinjaSentaiKakuranger'' and ''Series/NinpuuSentaiHurricanger''. The episode was supposed to air on April 5, exactly 40 years to the day of the premiere of ''Goranger'', but due to the show's entire schedule being delayed by one week because of preemption regarding the death of a Japanese journalist at the hands of ISIS, it became a belated birthday celebration on April 12; nevertheless, Episode 6, which aired on the anniversary date because of it, still acknowledged the milestone by beginning the OnTheNext preview with a photocollage of all 39 teams up to that point.
* As noted under ''Super Sentai'', the 30th anniversary of the ''Franchise/MetalHeroes'' franchise was celebrated with its first hero, Series/SpaceSheriffGavan, returning in a ''Gokaiger'' movie. This was followed by a standalone film, ''Film/SpaceSheriffGavanTheMovie'', that was intended to start a {{revival}} for the franchise by [[LegacyCharacter introducing a new Gavan]], but it bombed.
* ''Franchise/KamenRider'', in chronological order:
** ''Film/KamenRiderZX'' (1984), the tenth hero to bear the Rider monicker, is a low-key version. He was first advertised in a ''year-long'' promotion campaign across several mediums before finally debutting in a TV Special.
** The {{deconstruction}} film ''Film/ShinKamenRiderPrologue'' was made for the 20th anniversary of the franchise. it was released on 1992, one year off the actual anniversary of 1991.
** {{Averted}} by ''Series/KamenRiderAgito'' (2001): the only thing marking the show as the 30th anniversary of the franchise is a disclaimer opening the first episode. Then again, the franchise was just [[Series/KamenRiderKuuga fresh off a]] {{revival}} at the time; survival was a more pressing matter back then. However, ''Agito'' did introduce traditions that would stick for all the following years, including multiple Riders as the norm and the utter lack of ending credits.
** ''Series/KamenRiderKabuto'' (2006) had a few smaller things to celebrate the ''Kamen Rider'' franchise's 35th anniversary, including the return of blatantly insect-themed suits and after-show review segments for episode 23 to 27.
** ''Series/KamenRiderDecade'' (2009), a year-long celebration of 10 years of the franchise's Heisei era in the form of a CrisisCrossover (a crisis which, oddly enough, eventually expands to celebrate the franchise's 38-year history by the end).
** ''Series/KamenRiderOOO'' (2010-'''2011''') and ''Series/KamenRiderFourze'' ('''2011'''-2012) collectively celebrate the franchise's 40th anniversary.
*** The ''Let's Go Kamen Riders'' movie features OOO along with [[Series/KamenRider the original two Kamen Riders]] and [[CashCowFranchise Cash Cow Sub-Franchise]] ''Series/KamenRiderDenO''. The rest of the Riders make cameos as BigDamnHeroes during the final fight, too. The film also doubles as a celebration of the Toei Company's 60th year, which it marks with [[spoiler:a special cameo scene where four of ShotaroIshinomori's non-''Kamen Rider'' {{toku}} heroes intercepting and quickly killing off a retreating [[Series/KamenRiderStronger General Shadow]].]] Furthermore, episodes 27 and 28 of ''OOO'' happen to be the 999th and 1,000th episodes of the franchise as a whole, and feature the characters... filming a movie about ''Kamen Rider''.
*** ''Fourze'' is named for "40", in-universe for the 40 Astro Switches he can use but obviously also for 40 years (in addition to continuing the previous years' NumerologicalMotif [Decade was 1, Double was 2, OOO was 3]). It also mentions UrbanLegends about previous Riders, and uses ThemeNaming that references classic Riders. Plus the traditional crossover-with-the-previous-Rider movie was expanded from just OOO and Fourze to include the first seven Riders and OOO's predecessor ''Series/KamenRiderDouble''. The aforementioned ''Superhero Taisen'' crossovers with ''Super Sentai'' also launched [[Film/KamenRiderXSuperSentaiSuperheroTaisen its debut movie]] during ''Fourze'''s run. And on top of all that, a series of joint anniversary crossover shorts with the 20th anniversary of the ''Anime/CrayonShinChan'' anime.
** As the 15th Heisei-era series, ''Series/KamenRiderGaim'' (2013-2014) included several events uniting the fifteen Heisei Riders. First, Gaim made his [[EarlyBirdCameo debut appearance]] in [[PostScriptSeason post-script two-parter]] of the previous season, ''Series/KamenRiderWizard'', that featured the fifteen Riders together. Then the ''Wizard''/''Gaim'' movie had them sucked into an AlternateUniverse where counterparts of the Heisei Riders fought for dominance. And after that, the annual ''Superhero Taisen'' crossover became ''[[Film/HeiseiRiderVsShowaRiderKamenRiderWarsFeaturingSuperSentai Kamen Rider Taisen]]'', pitting the fifteen Heisei Riders against the fifteen original Showa-era Riders (and [[DemotedToExtra Demoting Sentai to Extras]]). As for the show itself, the execs took the opportunity to shake up the formula that had been in place since the ''Decade'' anniversary ended; going as far as hiring Creator/GenUrobuchi as lead writer and letting him go full "[[FanNickname Uro]][[AnyoneCanDie butcher]]" on his scripts for the express purpose of breaking down the image of the franchise as people knew it.
** 2016 has Toei celebrating both Super Sentai and Kamen Rider's anniversaries with ''Super Hero Year'', which kicks off with the 45th Anniversary Kamen Rider film, ''Kamen Rider #1 the Movie'', which gives the original Kamen Rider's costume a modern day update.
* The Japanese ''Series/IronChef'' had a 2000th plate special commemorating the number of dishes that had been served on the show. Chef Joel Robuchon was a special guest judge, and the Chairman Kaga chose his five favorite and three least favorite dishes to have been served on the show.
* ''Series/StargateSG1'' had "Wormhole X-Treme" as its 100 episode, and another metahumor episode for the 200th episode.
** Part of the plot of "200" is that Mitchell is about to take his 200th trip through a stargate. This allows them to get away with saying things like "This is gonna be huge. The big 2-0-0!" within the episode itself.
* ''Series/{{Friends}}'' "The One Hundredth": Phoebe gives birth to the triplets.
* ''Series/{{Smallville}}'' featured the death of a main character in the 100th episode. In the 200th episode, Season 10's "Homecoming", [[spoiler:Clark lets go of his guilt over his father's death, which was the aforementioned main character death that happened a hundred episodes earlier. And, at the very end of the episode, [[LastGirlWins he and Lois]] share a dance, and, without either of them noticing, he begins to hover.]]
* ''Series/TheXFiles'' had a fake 100th episode; they claimed it to be the 100th episode in the promos but if you do the math, the episode is the 99th episode to air. Scully's cancer was cured in this episode and it also concluded a few other subplots as well. The actual 100th episode to be aired was a flashback episode that showed how the Lone Gunmen formed in 1989 and met Mulder and Scully was not in that episode. Their 200th episode was some stupid ''Series/BradyBunch'' episode.
* Creator/StephenColbert did the 100th episode of ''Series/TheColbertReport'' in a tuxedo, and had the same guest as on the first episode (the first ever repeat guest). ''Series/TheDailyShow'' ran segments celebrating their '10 F#@king Years' anniversary every now and then for six months.
** The '10 F#@king Years' segments were made more hilarious by the collective cast acting as though they hadn't achieved something, but rather that they had just been through something terrible, and it wasn't over yet.
** The Fifth Anniversary Show was ''supposed'' to be a big deal with lots of correspondents weighing in, but everyone had something else to do at the last moment and sent apology videos (Stephen Colbert's was a VideoWill). Even the guest was on the other end of a satellite connection.
* ''Series/LawAndOrderSpecialVictimsUnit'''s 200th episode guest starred Creator/RobinWilliams. Come on, you know that was meant to be special (so to speak).
* The 100th ''Series/{{Scrubs}}'' episode was an elaborate parody of ''Film/TheWizardOfOz'', directed by Zach Braff.
* Referenced in ''Series/{{Monk}}'' with the CSI parody episode. The actual hundredth episode of ''Series/{{Monk}}'' features Monk's 100th case as a [[TheDocumentary documentary]]. [[spoiler:And then Monk ends up solving his 101st case inadvertently.]]
* ''Series/{{ER}}'':
** The 300th episode had the doctors betting on the number of patients they would have that night. The winner had a round 300.
** Its 100th episode had them host a woman who was born 100 years ago that day.
* ''Series/CSIMiami'' brushed with the Trope for their 100th, "Death Pool 100". The case just happens to involve counterfeit money, specifically $100 bills, but it's easy to miss. At the end of the episode, after most of the MontageOut, the core cast gathers on a beach casually talking about the case. The conversation ends by LeaningOnTheFourthWall:
-->'''Calliegh:''' Everyone thinks it's easy to make a hundred.\\
'''Horatio:''' We know better.
* ''Series/{{Lost}}'s'' 100th episode, "The Variable", [[EpisodeCodeNumber which was actually #96]], hinted at TonightSomeoneDies in previews ([[spoiler:someone did, fan favorite eccentric scientist Dan Faraday]]), tied in advertising for the 2009 ''Film/StarTrek'' movie as well as the show ''Flash Forward'', and aired immediately following UsefulNotes/BarackObama's 100th day address. As for the episode itself, it established the plan to alter the course of the series and prevent the crash of Oceanic 815. The occasion was also marked by a special ''Series/AceOfCakes'' with an awesome 100th episode cake.
* The 100th episode of ''Series/{{Frasier}}'' has the entire city of Seattle commemorating "Frasier Crane Day", to celebrate Frasier's 1,000th radio broadcast, and also has Niles and Frasier actually on-location and walking around Seattle.
* ''Series/{{Seinfeld}}'' had a clip show called ''The Highlights of 100''.
* In the 100th episode of ''Series/{{Charmed}}'', the [[HeelFaceRevolvingDoor constantly switching between good and evil]] character Cole Turner aka Belthazor was finally KilledOffForReal. In the 150th episode, the resident MrExposition Leo became human. The Avatars have something to do with both events.
* The 100th episode of ''Series/That70sShow'' was a musical, with Fez imagining the cast covering some of the '70s hit songs.
* The ''Franchise/UltraSeries'' has done quite a few. Not surprising, given [[LongRunners its age]].
** In 1973, Creator/TsuburayaProductions celebrated its 10th birthday with three new shows: ''Series/JumborgAce'', ''Series/{{Fireman}}'', and ''Series/UltramanTaro'', an AffectionateParody of their beloved franchise.
** On their 30th birthday, Tsuburaya created ''Film/UltramanZearth'', another AffectionateParody of the franchise.
** On ''Series/{{Ultraman}}'''s 30th anniversary, Tsuburaya made ''Series/UltramanTiga'' in 1996, which finally revived the franchise from a 16-year hiatus in Japan. The show carried many homages to the older entries and one episode even had an alien go to 1964 to buy a monster from Creator/EijiTsuburaya'' to conquer Earth with Tiga teaming up with the original Ultraman too!
** The franchise's 35th anniversary was the 2001 ''Series/UltramanCosmos'' movie First Contact where Ultraman Cosmos battles against Ultraman's Archenemy, Baltan Seijin. It also serves as the prequel to the series.
** In 2006, they made "Series/UltramanMebius'' and its tie-in movie ''Ultraman Mebius & The Ultra Brothers'' were made "Comemmorating 40 Years of ''Ultraman", revisiting the original Showa era universe (''Ultraman'' to ''Ultraman 80'') after 25 years of {{alternate universe}}s and featuring returning actors, characters and monsters from there.
** For the 45th anniversary, Tsuburaya released two movies. One before and one after the year of the anniversary (2011). The first was ''Film/UltramanZeroTheRevengeOfBelial'' and the second was ''Film/UltramanSaga''. The former was a direct sequel to ''Film/MegaMonsterBattleUltraGalaxyLegends'' and sees Ultraman Zero team up with [[{{expy}} expies]] of Series/{{Fireman}}, Series/JumborgAce, and Series/{{Mirrorman}} to defeat the BigBad. The second movie (another sequel) has Zero team up with Series/UltramanDyna and Series/UltramanCosmos to defeat Hyper Zetton, an insanely powerful version of the first monster to kill an Ultraman.
* ''Series/HowIMetYourMother'':
** 99 episodes of almost zero amount of information about the mother, then comes along episode 100 with a huge information overflow. And Creator/NeilPatrickHarris [[TheCastShowoff shows off]] his singing with a [[http://www.youtube.com/watch?v=mbBs2OcR8a8 musical tribute to suits.]] It played with TonightSomeoneDies by "killing off" one of Barney's suit jackets. His tailor even likening using its buttons on another suit to "organ donation".
** "The Slutty Pumpkin Returns", the SequelEpisode to "The Slutty Pumpkin", is an in-story example -- even though the series began in 2005, Ted first met the girl known as Slutty Pumpkin in 2001. The episode itself takes place in 2011, during which Ted finally meets the girl who wore the Slutty Pumpkin costume again, after years of waiting for her in the same "hanging chad" costume at the same Halloween party (not unlike [[{{Peanuts}} Linus waiting for the Great Pumpkin]]).
** The 200th episode is ADayInTheLimelight for the Mother herself as she tells her side of the story at various points in the series.
* ''Series/SesameStreet'':
** The series had anniversary specials during years 10, 20, 25, 30, and 35. The 40th anniversary had to settle on-air with "40" (the highest number in the show's curriculum) sponsoring the season premiere. That season was also loaded with ContinuityNod {{Easter Egg}}s and cameos (both on-set and in photographs) of staff members and retired Muppet characters (including Kermit the Frog, who was retired from ''Sesame Street'' since the Disney buyout of Franchise/{{the Muppets}}, and a generic Muppet specifically created for the ''Series/{{Scrubs}}'' episode "My ABC's", which was an ImagineSpot-induced FakeCrossover with ''Sesame Street''). Season 40 also premiered 40 years to the day that ''Sesame'' premiered on November 10, 1969.
** In 1977, the 1000th episode was commemorated with a primetime special on PBS entitled ''Sesame Street At Night?''[[note]]Not a typo - the title is based on a critic's remark that the show was "too good for kids"[[/note]], hosted by Gene Shalit.
* ''Series/BarneyAndFriends'' had Old King Cole come over for a visit in episode 100. Barney is reunited with some alumni to celebrate ten years, and gets a memory book after twenty years.
* Played straight with the 100th episode of ''Series/BluesClues'', where Joe and Blue did not search for clues, instead choosing to do a ClipShow where the entire cast reminisced about their past adventures. Steve Burns [[TheBusCameBack even made an unexpected guest appearance visiting from "college"]] to disprove the countless rumors going around at the time as to why he left the show.
* ''Series/TrueLife'' so far has had a "Where Are They Now" episode for its 100th episode (2007) and its 200th episode (2011). In them, they revisited some of the most memorable people (the 100th episode included a girl with Tourette's Syndrome and a little person who was a Britney Spears impersonator, 200th episode included an alcoholic who ran over her boyfriend and a girl who had alopecia).
* The tenth season premiere of ''Series/MysteryScienceTheater3000'' had TV's Frank returning to reap souls ("Second Banana Heaven was way too political") and Joel Hodgson returning to fix up the Satellite of Love.
* The 100th episode of ''Series/ThirtyRock'' was a one-hour episode about the ShowWithinAShow's 100th episode, and was even titled "100th".
** The episode also featured special guest appearances from Creator/MichaelKeaton and Creator/TomHanks, the important plot point of Tracy deciding to leave movies to return to TV, the return of Dennis Duffy (a recurring character who was Liz's boyfriend in the first season) and a gas leak that caused the cast to reminisce about the past while in an altered state.
* The entire 25th and final season of ''TheOprahWinfreyShow'' is a milestone celebration, with her bringing back her favorite or most shocking guests.
* The 100th episode of ''Series/{{Bones}}'' flashes back to how Booth and Brennan met and first worked together and has Booth confess his love for Brennan.
* In ''Series/{{Supernatural}}'''s 100th, Sam and Dean finally meet their half brother Adam and also rebuild their relationship.
** The recent 200th episode is a MusicalEpisode.
* ''Series/GilmoreGirls'' 100th episode has Emily and Richard renewing their wedding vows.
* The 100th episode of ''Series/OneTreeHill'' has Karen return for Lucas's wedding where he is left at the altar, and Dan rescues Nathan and Haley's son Jamie after he is kidnapped.
* The 100th episode of ''Series/DesperateHousewives'' plays with the TonightSomeoneDies card by killing off a previously unseen character who has been a part of the main character's lives for over a decade, the flashbacks in the episode show his involvement in their lives. Season one characters Martha Huber and Yao Lin also make a reappearance.
* ''Series/{{NCIS}}'' celebrated their 200th episode "Life Before His Eyes" with a lot of [[ContinuityNod continuity nods]] to the previous eight seasons. WordOfGod says this episode was a "gift to the fans".
* The 100th episode of ''Series/CriminalMinds'' was actually called "100". The episode was told in AnachronicOrder with the team being interviewed by [[TyrantTakesTheHelm Strauss]] because [[spoiler: Hotch killed an infamous serial killer who murdered his ex-wife]].
* ''Series/TheVampireDiaries'' reached their hundred episode in "500 Years of Solitude", an episode focused on fan-favorite [[FemmeFatale Katherine]] that also features the guest appearance of characters who left the series long ago (Jenna, John, Alaric, Vicki, the Mikaelson siblings…)
* Meanwhile in soap operas, ''Series/{{Neighbours}}'' had celebrated both episode number milestones and anniversaries, usually by having some big event happen in the episode in question. Especially big milestones were the 1000th episode (Des and Jane's engagement party, which was crashed by Creator/GuyPearce), the 2000th episode (Helen's birthday party) the 10th anniversary (unaddressed onscreen, but a special book and video were released), the 4000th episode (Flick rescuing Lou and Rosie from a fire), the 20th anniversary (an in-universe documentary featuring numerous former Ramsey Street residents, some of whom returned to the street), the ''5000th'' episode (Paul being buried alive by his murderous son Robert), and the 25th anniversary (in late 2010). The 6000th episode (and the week leading up to it) created a mystery over an apparent murder attempt on Paul Robinson's life, which kept going for several months after. The 30th anniversary is to be marked in-universe by the Erinsborough Festival, again featuring returns from numerous residents (some of which haven't been in the street since 1990).
* ''Series/HomeAndAway'' has likewise celebrated milestones such as Episode 2000 (Angel's departure from Summer Bay), 3000 (Mitch's departure, as well as Alex and Dani's car crash), 4000 (Alf's birthday party, with numerous past characters returning, which also ended in a car crash) and the 20th anniversary (which saw Sally, a regular character since the first season, leave the bay).
* ''Series/TheBigBangTheory'''s 100th episode focused on the [[TheEndingChangesEverything possibility]] of [[OfficialCouple Leonard and Penny]] getting back together. They also had special behind the scenes video with the cast looked back at the series so far.
** The ''200th'' episode focused on Sheldon's birthday, and featured surprise appearances by Creator/AdamWest , StephenHawking , Creator/WilWheaton and Sarah Gilbert as Leslie Winkle (for the first time since Season Three)
* ''Series/{{JAG}}'' celebrated its 100th episode "Boomerang (Part I)" by filming it on location in Australia, and the 200th episode was a WhatIf.
* ''Series/SaturdayNightLive'' parodied this with their 100th Digital Short which was a music video called "We're Gonna Suck Our Own Dicks", a big musical CallBack to all the other Digital Shorts. The show itself has had some big celebrations of its own, though:
** The 15th anniversary was marked with a prime time retrospective that featured clips and interviews.
** The 25th anniversary season warranted a ''live'' prime time special prior to the season premiere, featuring a variety of cast members, guest hosts, and musical guests on stage and in the audience. After that, they didn't do another special of this magnitude until...
** The 40th anniversary special in February 2015, a prime time live show that ran ''three and a half hours''...plus a one hour RollOutTheRedCarpet arrival special beforehand! Highlights included such skits as a gigantic "Celebrity Jeopardy" round that had far more than three contestants, a medley of the most popular musical characters (Operaman, The Blues Brothers, etc.), Creator/EddieMurphy returning to the franchise after ''decades'' of avoiding it, etc. As a bonus, in the weeks leading up to the event VH-1 Classic turned over '''its entire schedule''' to rerunning favorite episodes from every season, moving backwards to the 1975 series premiere, which aired right before the aforementioned red carpet special began on NBC.
* November 4, 2013 is the tenth anniversary of ''Series/RetroGameMaster'', at which point it will be considered a LongRunner. The show's celebrating it throughout the whole year.
* ''The Late Show with Creator/DavidLetterman''
** There is often has a celebratory episode on their anniversary date (August 31) or the episode broadcast nearest the date if it falls on a weekend. The celbrants often include Creator/BillMurray, who was Dave's guest on the first episodes of bothe ''Late Show'' and ''Late Night''.
** Barely a year into ''The Late Show'' Dave announced they had broadcast 1,000 epiosdes with a huge '''1000''' chroma key. Then he said he misread and they'd actually done 100 episodes, with a much smaller and more subdued 100.
* The November 11, 2013 broadcast of ''Series/{{Panorama}}'' marked exactly 60 years of the show, and so it ended with [[http://www.youtube.com/watch?v=pIBnwQWdn4M a special credits montage]].
* As lampshaded in the VideoGame/ParappaTheRapper episode of ''Series/RetroGameMaster'', a PS1 game is played for special occassions.
* On NewTricks, the 100th episode saw off the last original cast member, Dennis Waterman. (Particularly impressive because of BritishBrevity, and because the premise of the series was to assemble ex-cops who were already ''beyond pension age'' to begin with.)
* The 8th season premiere of ''Series/RuPaulsDragRace'' was the 100th episode of the show and also featured the 100th contestant overall. The show celebrated these milestones by having a main challenge that called back several design challenges from the entire run of the show.

* ''Machinima/Supermarioglitchy4sSuperMario64Bloopers''
** "[=SM64=]: Mario in real life!? (200 vid special)".
** "Ssenmodnar 2 (100th vid)" could also count.
** "P.O.I.S.O.N.E.D. Computer" was [=SMG4=]'s 50th video, [[spoiler:although he didn't celebrate it and instead put a caption at the beginning saying [[ExactlyWhatItSaysOnTheTin exactly that it ]] ''[[ExactlyWhatItSaysOnTheTin is ]]'' [[ExactlyWhatItSaysOnTheTin his 50th video]]]].

* The 40th anniversary issue of ''People'' magazine had Music/TaylorSwift on their cover, making an [[http://i.perezhilton.com/wp-content/uploads/2014/10/taylor-swift-435__oPt.jpg identical pose]] to Creator/MiaFarrow [[http://img2.timeinc.net/people/i/2014/specials/40th-anniversary/timeline/mia-farrow-435.jpg on the magazine's first cover]].

* Many artists celebrate anniversaries of their best known albums by rereleasing them in remastered or [[LimitedSpecialCollectorsUltimateEdition upgraded]] versions. At times entire catalogues can get this treatment (such as Music/JohnLennon's one at 2010, when he would complete 70 years).
* Music/TheBeatles released their GreatestHitsAlbum ''1'', with all their number ones, on the 30th anniversary of their break-up in 2000.
* Music/TheRollingStones celebrated 40 years with ''Forty Licks'', a GreatestHitsAlbum that as the title indicates had 40 tracks (4 of them new). 10 years later they did the same with the 50-track (two of them new, and one of the old ones being from ''Forty Licks'') ''GRRR!'', whose only disadvantage upon the predecessor was a ContemptibleCover.
* Music/PearlJam celebrated 20 years of debut album ''{{Music/Ten}}'' with the documentary ''Pearl Jam Twenty''.
* {{Music/Blur}} released a box set containing all of their albums for the 21st anniversary of their first one.
* Music/MichaelJackson examples:
** He threw two all-star tribute concerts to ''himself'' at Madison Square Garden in September 2001 to mark the 30th anniversary of his first release as a solo artist, though these and remastered/mostly expanded reissue of his first four albums for Epic Records was more to promote his forthcoming ''Music/{{Invincible}}'' than anything.
** In 2007, ''Thriller 25'' was a second expanded reissue of [[Music/{{Thriller}} that particular album]] that added new versions of several tracks, pairing Jackson up with contemporary hitmakers.
** In 2012, ''Music/{{Bad}} 25'' was a second expanded reissue of ''Bad'' that had a tie-in documentary helmed by Creator/SpikeLee.
** A 25th anniversary reissue of ''Music/{{Dangerous}}'' was announced for 2016, to feature new songs, demos and remixes.
* Music/DavidBowie examples:
** He marked his ''66th'' birthday in 2013 with the surprise announcement of his first studio album in ten years, ''Music/TheNextDay'', via the relaunch of his official website and the release of its first single/video, "Where Are We Now?"
** In 2014, the 3-disc GreatestHitsAlbum ''Nothing Has Changed'' marked 50 years of Bowie recordings, featuring the new single "Sue (Or in a Season of Crime)" to bookend his first single, 1964's "Liza Jane". This also made it the first Bowie-curated compilation to include pre-''Music/SpaceOddity'' songs.
* Anniversaries of Music/JeanMichelJarre's ''Oxygène'':
** He celebrated the 20th anniversary by releasing the back-to-the-roots-but-still-kind-of-90s sequel album ''Oxygène 7-13'' — about half a year late, but still. When asked back then which ''Oxygène'' is his favorite, he jokingly replied it's [[LampshadeHanging the third one he's going to release in another 20 years]]. We have yet to see whether he'll actually make a third ''Oxygène''. After the new album came Jarre's first indoors tour, the ''Oxygène Arena Tour'', during which neither of the two ''Oxygènes'' were played in full.
** He also celebrated the 30th anniversary. First he largely re-recorded the original ''Oxygène'' at his studio. Then he took his three live co-keyboardists and his entire rig of about five dozen mostly vintage synths to the Belgian Alfacam Studios to re-record ''Oxygène'' yet again, this time not overdubbed but played live by these four musicians while being filmed and expanded by three ''Variations''. The outcome was titled ''Oxygène – Live in Your Living Room''. Next, he took ''this'' concept onto a live stage at Théâtre Marigny where he played ten concerts in a row. And then an actual tour followed with still the same concept. By then, Jarre was one and a half years late, and the last concerts of that tour were more than two years late, but the French consider being in time bad manners. All in all, Jarre celebrated the 30th anniversary of ''Oxygène'' by remaking the entire album 47 times over.
** Some of Jarre's single concerts were Milestone Celebrations themselves. ''Rendez-vous Houston'' celebrated the 150th anniversaries of Houston and Texas and the 25th anniversary of NASA. ''Paris La Défense'' was scheduled to celebrated the 200th Bastille Day (and the 10th anniversary of Jarre's debut concert) but was delayed by one year. ''Oxygen in Moscow'' was part of Moscow's 850th anniversary.
** By the way, Jarre played the ''Europe in Concert'' show in Brussels at the Atomium on his 45th birthday. It was ''his audience'' who celebrated ''him'' at the concert.
* Music/GaMetal[='s=] fiftieth song was a medley of remade previous songs. The hundredth [=GaMetal=] song was also a medley, this time of gaming's most iconic tunes.

[[folder:Professional Wrestling]]
* The "Fifth Year Festival'' Wrestling/RingOfHonor held in its place of its usual anniversary show was a six day tour starting in NYC, New York and ending in Liverpool.[[/folder]]

* In ''Roleplay/DestroyTheGodmodder'', actions are more powerful and far more likely to succeed when they happen on milestone posts. The first post of a page milestone, or a number of posts milestone, a slight bonus is even given if someone calls their page claim.
** There was also a very big and interesting event involving time travel shenanigans on the one year anniversary.

[[folder:Tabletop Games]]
* For the 20th anniversaries of ''TabletopGame/VampireTheMasquerade'', ''TabletopGame/WerewolfTheApocalypse'', and ''TabletopGame/MageTheAscension'', Creator/WhiteWolf released 20th anniversary editions of the games, compiling the splats and powers released over each game's history into a single corebook, though W20 and M20, thanks to ScheduleSlip, came out after their anniversaries.

* Creator/CirqueDuSoleil milestone celebrations:
** ''Theatre/{{Alegria}}'' launched in 1994 as the company's 10th anniversary show; the year also saw the retrospective documentary ''A Baroque Odyssey''.
** The 20th anniversary of the company was marked with, among other things, the retrospective book ''20 Years Under the Sun'' and the ''Midnight Sun'' concert in Montreal. The latter doubled as a 25th anniversary marker for the city's international jazz festival, which the concert was held at.
** The 25th anniversary ("The Dream Continues") included a [[http://www.zimbio.com/pictures/_ogLfx9C17Y/Cirque%20Du%20Soleil%20Holds%2025th%20Anniversary%20Guinness/42DW1agxY2N stilt-walking event centered on Las Vegas]], a two-disc GreatestHitsAlbum featuring songs from almost every show produced up to that point, and a book on the company's costumes over the years.
** The 30th anniversary was marked with the two-plus week run of a choral concert of Cirque music performed in Montreal's Saint-Jean-Baptiste Church and the photo book ''Backstage Cirque du Soleil''.
** Individual shows often mark their 1st, 5th, [[LongRunners 10th, etc.]] anniversaries with a curtain call celebration during the performances that fall on the date in question, and perhaps a small gift for audience members that night (a 15th anniversary pin at ''"O"'', for instance). In Las Vegas, ads that year will include a special logo noting the milestone. Celebrations have also been held to mark a show reaching 100, 500, 1000, 1500, etc. performances.
** There was also a special celebration for a single performer in 2012. Longtime circus performer and ''Theatre/{{Mystere}}'' principal clown Brian Dewhurst's 80th birthday fell on a performance night, so a [[http://www.huffingtonpost.com/2012/06/01/brian-dewhurst-cirque-du-_n_1562498.html giant surprise party]] (yes, ''SurpriseParty'') was arranged for him, which played out over and after the two performances.
* The 20th anniversary of the London production of AndrewLloydWebber's ''ThePhantomOfTheOpera'' was marked with the [=BBC=] documentary special ''Behind the Mask''. The ''25th'' anniversary was marked with a mega-staging of the entire show at Royal Albert Hall (140 cast members as opposed to the usual 40, etc.), followed by a "grand finale" featuring appearances by most of the original London cast and a performance by Sarah Brightman (the original Christine); this was filmed and released on video.
* The tenth anniversary of ''Theatre/LesMiserables'' was celebrated with a concert at the Royal Albert Hall, and the 25th with a staging in the O2 arena, with TheReveal that they are making a [[Film/LesMiserables2012 movie musical adaptation]].
* ''Theatre/MissSaigon'' received a West End revival in 2014 to mark its 25th anniversary, and even got a new song for the occasion ("Maybe"). There was also a gala performance featuring both original and revival cast members, and tickets were dialed back to 1989 prices for that particular show.
* ''Theatre/TheWiz'' had its 40th anniversary honored in 2015 with a live performance on Creator/{{NBC}}, the digital release of a long-shelved movie tie-in soundtrack titled ''Diana Ross Sings Songs From Film/TheWiz'', and the announcement of a Broadway revival for the following year.

[[folder:Theme Parks]]
* The Ride/DisneyThemeParks have interesting anniversary promotions for whenever a park reaches the 10th, 25th, etc. anniversary of its opening day, usually debuting new rides/additions to the parks, new/updated shows and parades, and usually a large gimmick. Examples:
** For its 25th year, Disney World's Cinderella Castle was transformed [[http://waltdatedworld.bravepages.com/id75.htm into a gigantic pink cake.]]
** Mickey Mouse's 60th birthday was acknowledged at Florida's Magic Kingdom with a whole themed "land", Mickey's Birthdayland, in 1988. The park kept it and tweaked its theme over the years -- first it became Mickey's Starland, then Mickey's Toontown Fair -- until it was torn down in TheNewTens to make way for the Fantasyland expansion.
* Almost always averted with the UniversalStudios parks. There were plans to do a park-wide celebration of Islands of Adventure's 10th anniversary in 2009, but it was cut due to there being virtually no budget for it, as at the time most of it was going into the construction of The Wizarding World of Harry Potter. There was no 20th Anniversary celebration of Universal Studios Florida either, presumably for the same reason. In 2015, this was finally played straight when Universal Orlando honored their 25th anniversary, though even then the milestone nods were mostly limited to some special theming around the park and a new temporary logo.
* Done several times with [[Theatre/HalloweenHorrorNights Universal's Halloween Horror Nights]], first for their "Sweet 16" in 2006, then for their 20th anniversary in 2010, and once more for their 25th anniversary in 2015.

* Nendoroids are adorable, pseudo-bubblehead figurines primarily aimed at {{otaku}}. With that in mind, the 100th release in the line is a character who falls outside of that demographic: MickeyMouse, who is quite jarring when put next to franchises such as ''VideoGame/{{Touhou}}'' [[note]](no, Nazrin doesn't count)[[/note]] or ''{{Vocaloid}}''.
* ''Franchise/{{BIONICLE}}'' got a line of six small sets called the Stars, a collection of remakes of characters from across the series' decade of existence. They also happened to be the last sets before the line got the can. They tend to be perceived as [[AntiClimax a rather weak way]] to both celebrate a milestone and end the line.
* {{Franchise/Barbie}}:
** The original doll's 50th anniversary brought the My Favorite Barbie line of toys. Each set contains a reproduction of a famous Barbie doll, an extra outfit from the same era, and a retro pamphlet of other Barbie clothes and accessories sold at the time.
** ''WebAnimation/BarbieLifeInTheDreamhouse'' celebrated the 50th anniversary of Barbie's old friend Midge by adding her as a new major character.

[[folder:Video Games]]
* Creator/{{Capcom}} loves 'em:
** Capcom celebrated ''VideoGame/MegaMan''[='s=] 15th anniversary by releasing the ''Anniversary Collection'', a CompilationRerelease of all of the console classic ''VideoGame/MegaMan'' games (''1-8'', plus the arcade games ''Power Battle'' and ''Power Fighters'').
*** ''VideoGame/MegaManX 7'' was also part of the 15th anniversary celebration. Between the [[PortingDisaster GameCube version]] of the ''Anniversary Collection'' with its unpopular switched controls and just how godawful ''X7'' was, this didn't end well.
*** In fact, Capcom celebrated all things ''Mega Man'' for ''two'' years. It was odd.
*** And before that, ''VideoGame/MegaMan8'' itself was a 10th anniversary special, with an art booklet of previous games, and an animated intro that was a callback to the whole series at that point.
*** Despite everything [[VideoGame/MarvelVsCapcom3 that]] [[VideoGame/MegaManLegends had]] [[VideoGame/StreetFighterXTekken happened]] suggesting otherwise, it was confirmed that Capcom would be celebrating Mega Man's 25th anniversary. See ''VideoGame/RockmanXOver''. Despite this, evidence is that it isn't appropriate for celebrations, like with Sonic 2006. They then supported the fan-made ''VideoGame/StreetFighterXMegaMan'' as an anniversary game for both franchises, which is being better received.
** Capcom also celebrated ''Franchise/StreetFighter''[='s=] 15th anniversary by releasing the ''Street Fighter Anniversary Collection'', which had ''[[VideoGame/StreetFighterII Hyper Street Fighter II]]'' and ''[[VideoGame/StreetFighterIII Street Fighter III 3rd Strike]]''. Oddly enough, the original ''[[VideoGame/StreetFighterI Street Fighter]]'' wasn't present.
** For the twentieth anniversary of the release of ''VideoGame/BionicCommando'' (1988), a 2.5-D remake of the original was released in 2008, with a fully 3-D sequel following in early 2009.
* ''VideoGame/RuneScape'' celebrated its 100th quest with a continuation of the first one, divided in several segments with their own rewards. It was basically the biggest quest until that point.
* ''{{VideoGame/Contra}} 4'' was released at the 20th anniversary game for the series, emphasized with its heaps of series FanService ([[MyFriendsAndZoidberg although the other type is unlockable]]).
* Creator/SquareEnix had a group of ''Franchise/FinalFantasy'' games released under the 20th Anniversary banner of the series, including a PSP UpdatedRerelease of the original and the MassiveMultiplayerCrossover ''VideoGame/DissidiaFinalFantasy''.
** At the same time, the latest part of the Compilation, ''VideoGame/CrisisCore: VideoGame/FinalFantasyVII'', was promoted as part of the 10th anniversary of ''Final Fantasy VII''.
** ''VideoGame/TheatrhythmFinalFantasy'' was released to coincide with the franchise's 25th anniversary.
* [[Creator/ElectronicArts EA Sports]] listed ''Madden NFL 2005'' at the 15th anniversary of the series, and released a collector's edition with earlier versions of the game updated with modern rosters. Oddly enough, ''Madden 2009'' was billed as the 20th anniversary, and the would-be ''Madden 2014'' was billed as ''Madden 25''. [[WritersCannotDoMath Math never was EA's strong suit]]. [[note]]The discrepancy comes from the fact that the series usually releases late in the calendar year before the one listed, so ''Madden 2000'' was actually released in 1999. The first game, retroactively called ''Madden 1988'', was the only exception, being released in the year 1988.[[/note]]
* Franchise/SonicTheHedgehog's tenth anniversary was celebrated with ''VideoGame/SonicAdventure2''. The fifteenth, with ''[[UpdatedReRelease Sonic the Hedgehog Genesis]]'' and VideoGame/SonicTheHedgehog2006 - though neither [[PortingDisaster were in any way appropriate]] [[ObviousBeta for celebrations]] (but the latter has some justification in being rushed for both it and [[ChristmasRushed a Christmas release]]).
** The 20th anniversary game, ''VideoGame/SonicGenerations'', builds off the successes of ''VideoGame/SonicColors'' and ''VideoGame/SonicTheHedgehog4'' one year prior. Its biggest selling point is [[InternalHomage the return of the classic]], black-eyed Sonic, running alongside the modern, {{Green Eye|s}}d one, each with their respective, seperate gameplay in a time travel plot that revisits areas from the preceding nine main games of the series. [[LampshadeHanging The plot is even based on a time-altering villain crashing Sonic's birthday party.]]
*** It's not just the hedgehog celebrating his 20th birthday --- the {{Vocaloid}}s get in the act in a minor way, as the third title of Sega's ''Project Diva'' series of Vocaloid {{Licensed Game}}s, released just a few days after ''Generations'', includes a Vocaloid cover of "[[VideoGame/SonicAdventure2 Live & Learn]]" in the [[{{Feelies}} bundled]] bonus CD and an in-game Sonic costume for Miku '''because''' of ''Generations'' (in contrast the other Sega-themed costumes in the series[[note]]culled from ''VideoGame/SpaceChannel5'', ''VideoGame/ValkyriaChronicles'', ''VideoGame/VirtuaFighter'' and ''VideoGame/VirtualOn''[[/note]] were included merely for the sake of {{Shout Out}}s).
* ''VideoGame/CastlevaniaPortraitOfRuin'' was released in 2006, 20 years after the release of 1986's ''[[VideoGame/CastlevaniaI Akumajo Dracula]]'' for the Famicom Disk System in Japan. The game includes plenty of references to series history and pre-order bonuses included an artbook, timeline, and soundtrack [=CD=], all of which containing art/information/music spanning the entire series.
** ''VideoGame/CastlevaniaTheAdventureReBirth'' was released for [=WiiWare=] in Japan exactly twenty years after [[VideoGame/CastlevaniaTheAdventure the original Game Boy game's]] release.
* ''Franchise/SuperMarioBros'' celebrated its anniversary [[note]](that is, of ''VideoGame/SuperMarioBros1'', not of Mario's real debut in ''VideoGame/DonkeyKong'')[[/note]] with "[[GratuitousEnglish Happy! Mario 20th]]". They had a website (now defunct) and a soundtrack (with selections from the original game, ''VideoGame/SuperMarioBrosTheLostLevels'', ''VideoGame/SuperMarioBros3'', ''VideoGame/SuperMario64'', and ''VideoGame/SuperMarioSunshine'') to celebrate with it, and they even offered a [[http://img277.imageshack.us/img277/4576/sonicmariosbirthday0xw.jpg "20th Happy Mario!"]] ''[[Franchise/SonicTheHedgehog Sonic]]'' shirt!
** For the 25th Anniversary in 2010, Nintendo set up [[http://www.nintendo.co.jp/mario25th/ two]] [[http://mario25th.nintendo.com/ websites]] and rereleased the SNES game ''VideoGame/SuperMarioAllStars'' for the UsefulNotes/{{Wii}} with a book and soundtrack.
** Nintendo also celebrated the 30th anniversary of Luigi's first appearance in ''VideoGame/MarioBros'', calling the year 2013 "TheYearOfLuigi" in order to celebrate the release of two Luigi-centered games (''VideoGame/LuigisMansionDarkMoon'' and ''VideoGame/MarioAndLuigiDreamTeam'') as well as the ''VideoGame/NewSuperLuigiU'' ExpansionPack for ''VideoGame/NewSuperMarioBrosU''.
** The 30th anniversary of ''Franchise/SuperMarioBros'' was celebrated with the release of ''VideoGame/SuperMarioMaker'', a GameMaker allowing players to create 2D Mario levels of their own including art styles based on ''VideoGame/SuperMarioBros1'', ''VideoGame/SuperMarioBros3'', ''VideoGame/SuperMarioWorld'', and ''VideoGame/NewSuperMarioBrosU''. Website/{{Google}} also celebrated the anniversary by adding a question mark box straight from the first 8-bit title (which even gives you a coin when you click it, and an extra life if you click it 100 times) when you search for "Super Mario Bros.".
* ''SpaceInvaders'' celebrated their 30th anniversary with ''Space Invaders Get Even'', where the eponymous invaders become {{Villain Protagonist}}s. They also released ''Space Invaders Extreme'', which is a modern revamping of the game.
* ''VideoGame/TheKingOfFighters XII'' was rushed to market to mark the series' 15th anniversary. As ''VideoGame/SonicTheHedgehog2006''[='s=] equal circumstances had already demonstrated, results were disappointing.
* ''VideoGame/HarvestMoon'' had two SpinOff games made for the series' 10th anniversary: ''Rune Factory: A Fantasy Harvest Moon'' and ''Innocent Life: A Futuristic Harvest Moon''. The former proved popular enough to [[VideoGame/RuneFactory become its own series]].
** Also for their 10th anniversary Marvelous released two ''HarvestMoon'' games, ''DS'' and ''[[VideoGame/HarvestMoonMagicalMelody Magical Melody]]''. Both games were throwback games with the former taking place in [[VideoGame/HarvestMoonAWonderfulLife Forget-Me-Not Valley]] 100 years in the future, and the latter featured characters from previous games (mostly from the first game of the series). Both games are often cited as being the end of the "classic" HarvestMoon period, due to future games being vastly different from the older HarvestMoon style. The odd part is though, the games were released in 2005 when their anniversary was in 2006.
* The ''VideoGame/{{SaGa}}'' series celebrated its 20th anniversary by remaking ''VideoGame/{{SaGa 2}}'' as ''[=SaGa 2 Hihou Densetsu -Goddess of Destiny-=]''...and releasing a [[ArchivePanic 20-disc compilation]] of all the ''[=SaGa=]'' soundtracks.
* ''VideoGame/PacManWorld'' was released for the 20th anniversary of ''VideoGame/PacMan'' -- [[LampshadeHanging the plot is even based on a villain crashing Pac-Man's birthday party]]. ''Pac-Man World 3'' would later be released for his 25th anniversary.
** Website/{{Google}} celebrated ''Pac-Man''[='=]s 30th Anniversary by putting a [[http://www.google.com/pacman playable Pac-Man game on the Google main page]], where they usually just put picture links (Only ''Series/DoctorWho''[='=]s 50th, noted in Cross-Media above, would also get this same honor). NamcoBandai, for their part, announced ''WesternAnimation/PacManAndTheGhostlyAdventures'' during this period (it premiered three years later) and released the new arcade game ''[[http://www.youtube.com/watch?v=fVLOYkLje2Q Pac-Man Battle Royale]]''. [[ArsonMurderAndJayWalking And a Wii party game]], which introduced several character redesigns that would be ultimately finalized by ''Ghostly Adventures''.
* ''Franchise/{{Halo}}'':
** The [[VideoGame/HaloCombatEvolved first game]] got a graphically revamped UpdatedRerelease with bonus story content and a ''VideoGame/HaloReach'' NostalgiaLevel map pack (which could also be obtained as a seperate {{DLC}}) for its tenth anniversary. The rerelease was one of the first games developed by 343 Industries, the ''Halo'' studio established after Creator/{{Bungie}} became an indie studio.
** They did it again for the ten year anniversary of the [[VideoGame/{{Halo 2}} second game]], not just by graphically revamping ''Halo 2'' and adding further story content, but by compiling together the most recent versions of the first four numbered entries (including the before-mentioned H1 and H2 rereleases) into ''Halo: The Master Chief Collection'', which includes support for all four multiplayers (including every map ever released), the digital feature ''Halo: Nightfall'', and access to the ''VideoGame/Halo5Guardians'' multiplayer beta.
* ''Franchise/TheLegendOfZelda'' celebrated its 25th year with four games in 2011: ''[[VideoGame/TheLegendOfZeldaSkywardSword Skyward Sword]]'', remakes of ''[[VideoGame/TheLegendOfZeldaOcarinaOfTime Ocarina of Time]]'' and ''[[VideoGame/TheLegendOfZeldaFourSwords Four Swords]]'', and a rerelease of ''[[VideoGame/TheLegendOfZeldaLinksAwakening Link's Awakening]]'' that helped launch the Nintendo3DS's Virtual Console service. Plus a worldwide orchestral concert tour, [[PreOrderBonus promotional items]] for ''Skyward Sword'' and ''Ocarina'', and even a tribute level in ''VideoGame/SuperMario3DLand''. The anniversary concluded with the Japanese art book ''Hyrule Historia'', which revealed the complete timeline of the franchise for the first time ever.
* ''VideoGame/{{Solatorobo}}'' is considered to be CyberConnect2's 15th anniversary celebration, being a SpiritualSequel to [[TailConcerto the very first game they developed]].
* ''VideoGame/KingdomHearts3DDreamDropDistance'' marks the 10th anniversary of the ''Franchise/KingdomHearts'' series, noted in-game with a story recap feature to prevent ContinuityLockout. Coincidentally, it also has a tip of the hat to the 30th anniversary of ''Film/{{Tron}}'' on the same year with the inclusion of a ''Film/TronLegacy'' world.
* Parodied in ''VideoGame/TeamFortress2'': Valve meant to commemorate their 100th update with the medals that showed how long it was since you first started playing the game, but they had to put a bunch of other, minor updates before then. So when it finally came out, it was the 119th update, and they acted as if this was some major milestone to celebrate. It's also worth noting that the 300th update was a fairly major update that came with the release of Meet the Pyro, the last Meet the Team video.
* ''VideoGame/HalfLife1'' came out in November 1998. In November 2008, Valve offered the game to anyone who still didn't own it on {{UsefulNotes/Steam}} for 98 cents.
* Similar to the way they celebrated [[SuperMarioBros Mario's]] 25th anniversary, Nintendo created a similar package for Franchise/{{Kirby}}'s 20th anniversary, complete with book and soundtrack. However, since Nintendo didn't previously make a Kirby anthology, this release is all-new, including a museum mode giving details about the series.
* ''VideoGame/TheSims3'': High-End Loft Stuff. Since it was released around the time of The Sims franchise's 10th anniversary, 3 items from the original game were included in the pack: the giant fish tank, the electric guitar, [[BreadEggsMilkSquick and the vibrating love bed]].
* ''VideoGame/RatchetAndClankFullFrontalAssault'' was released to commemorate the duo's 10th anniversary.
* The ''VideoGame/SuperRobotWars'' franchise often releases a new installment for every fifth year since its inception:
** The 15th anniversary was ''VideoGame/{{Super Robot Wars Original Generation}}s'', compiling both ''Original Generation'' titles from the Creator/{{Nintendo}} UsefulNotes/GameBoyAdvance into a single game, effectively [[ContinuityReboot rebooting]] the sub-series.
** The 20th anniversary was the ''[[VideoGame/SuperRobotWarsZ Second Super Robot Wars Z: Hakai-hen'']]
** The 25th anniversary will be ''Original Generation'' sequel ''The Moon Dwellers'', which will have the honor of being released ''in English'' for non-Japanese regions.
* The Franchise/MetalGear series had two anniversary campaigns dedicated to it:
** The ''[=20th=] Anniversary'' campaign (the official logo being a pair of dog tags) saw a plethora of merchandises being released such as collectable figurines, soundtracks, t-shirts and of course, anniversary-themed reissues of the games themselves.
** For the ''[=25th=] Anniversary'' campaign (the logo this time being Snake hiding under a cardboard box with his legs sticking out) saw a similar influx of collectables, most notably "[=PlayArts=] Kai" figures based on characters from the original ''VideoGame/MetalGearSolid'', as well as an entire event dedicated to showing off the next entry in the series, ''Metal Gear Solid: Ground Zeroes'' (which later evolved into ''VideoGame/MetalGearSolidVThePhantomPain'').
* ''VideoGame/{{Drakengard 3}}'' was meant as this for the series marking the series 10th anniversary.
* ''VideoGame/PuyoPuyo'' Has two games for their 15th and 20th anniversary. Both games notably brought back some characters from some of the older installments, and the fans reacted positively enough to have some of them stay in the main series.
* ''VideoGame/StarTrekOnline'' has done a number of these for each year and then some.
** Year One Celebration - the alteration of Earth Spacedock into one more canonlike.
** Year Two Celebration - the introduction of the ''Odyssey'' and ''Bortasqu[='=]''-class ships
** Year Three Celebration - the "Temporal Ambassador" event, reintroducing [[Series/StarTrekTheNextGeneration Tasha Yar]] and the ''Enterprise''-C. The ''Ambassador''-class and ''Kamarag''-class ships joined the collection.
** Year Four Celebration - the introduction of Season 8.5, the mission "A Step Between Stars", which reintroduces [[Series/StarTrekVoyager Tuvok]] and introduces the Dyson Science Destroyer.
** There was also a celebration for ''Series/StarTrekTheNextGeneration'''s 25th Anniversary, which gave players Worf's Season One sash.
* According to [[http://www.famitsu.com/news/201505/26079347.html Famitsu]], ''[[VideoGame/ProjectXZone Project X Zone 2]]'' will be created not only as a sequel to ''Project X Zone'', but to celebrate the 10th anniversary of ''VideoGame/NamcoXCapcom'' as well.
* ''[[VideoGame/MetalSlug Metal Slug 6]]'', along with ''Metal Slug 3D'' and the ''Metal Slug Anthology'' pack was created to celebrate ''Metal Slug'''s 10th anniversary.
* According to WordOfGod, the release of ''VideoGame/EarthBoundBeginnings'' on VirtualConsole is meant to celebrate ''VideoGame/EarthBound''[='=]s 20th anniversary.
* To celebrate the fifth anniversary of ''VideoGame/FruitNinja'', special in-game events were added to not just ''Fruit Ninja'', but nearly all of Halfbrick's games.
* In November 2014, Sony celebrated the 20th anniversary of the Japanese launch of the first Playstation by releasing a LimitedSpecialCollectorsUltimateEdition UsefulNotes/PlayStation4 featuring a color scheme similar to the original console. It was produced in ''extremely'' limited quantities, however, so good luck finding a used one at a [[CrackIsCheaper reasonable price.]]
* ''VideoGame/{{Yakuza}}'', otherwise known as ''Ryu Ga Gotoku'' in its native Japan, celebrated the series' tenth anniversary with a remake of the first game. Not only were new features and content from recent titles implemented into the game, but the game introduced a new mechanic based entirely around BreakoutCharacter Goro Majima, and the story was also expanded to explore [[EvilFormerFriend Akira Nishiki's]] descent into villainy.
* ''Franchise/{{Pokemon}}'': The franchise celebrated its 20th anniversary in 2016 by doing a number of things.
** For each month of the year starting in February, one [[SecretCharacter Mythical Pokémon]] was distributed via various outlets depending on region (usually download codes given out at game stores for free). The release order was Mew in February, Celebi in March, Jirachi in April, Darkrai in May, Manaphy in June, Shaymin in July, Arceus in August, Victini in September, Keldeo in October, Genesect in November, and Meloetta in December.
** On the actual anniversary date of February 27, ''VideoGame/PokemonRedAndBlue'', ''Pokémon Yellow'', and ''Pokémon Green'' (Japan only) were released on the 3DS Virtual Console. Also released were specially colored 3DS/2DS bundles with one of the correspondingly-colored games already installed.
** Also on the actual anniversary date (in Japan), there was a worldwide announcement for the next core games, ''VideoGame/PokemonSunAndMoon'' with a Holiday 2016 release date.
** The earliest cards from [[TabletopGame/{{Pokemon}} the official Trading Card Game]] were reprinted.
** Two new games were released, ''VideoGame/PokemonGo'' for mobile and ''VideoGame/PokkenTournament'' for the UsefulNotes/WiiU.
** ''Anime/PokemonTheFirstMovie'', ''Anime/{{Pokemon 2000}}'', ''Anime/{{Pokemon 3}}'', and ''Anime/Pokemon4Ever'' were digitally remastered.
* ''VideoGame/{{Raiden}} V'' was planned to have a 2015 release to coincide with the main ''Raiden'' series' 25th anniversary. However, [[VaporWare it was delayed]] [[SavedFromDevelopmentHell until February 2016]], in which, coincidentally, 2016 was the 25th anniversary of ''Raiden Trad'' (the first ''Raiden'' consumer port) as well as 20th anniversary of ''VideoGame/RaidenFighters'' spinoff, which WordOfGod never explicitly mentioned on.

[[folder:Web Animation]]
* ''WebAnimation/HomestarRunner'': Strong Bad tried (and failed) to answer 50 emails in a row for his 50th Strong Bad E-mail, presented his 100th email (a flashback of how he met Homestar) in ''widescreeeeen!'', and traveled to meet alternate universe versions of himself for #150. For #200, there was a big build-up only for the resulting email to be addressed to Homestar rather than Strong Bad- it's then revealed that Homestar has had his own email show all along, which Strong Bad tries to ruin.
** Homestar Runner started as a children's book made by the creators in 1996, "The Homestar Runner Enters the Strongest Man in the World Contest". Ten years later, they did a cartoon remake of the children's book, with the characters retaining their current, more over-the-top personalities:
-->'''Homestar Runner:''' Everybody loves the me! I'm a terrific athlete!
** Also parodied in Issue 10 of ''Teen Girl Squad''. Keep in mind that in Teen Girl Squad, ''everyone'' dies OnceAnEpisode:
-->'''Cheerleader:''' It's our tenth issue-versary! Let's do a ClipShow!\\
'''So-And-So:''' Let's have [[ShotgunWedding a wedding]]!\\
'''The Ugly One:''' Let's have [[TheBabyTrap a baby!]]\\
'''What's Her Face:''' Let's [[TheyKilledKenny kill someone off]]!\\
'''Narrator Strong Bad:''' Okay! (''everyone dies suddenly in bizarre ways'')
* This practice was thoroughly mocked by WebAnimation/ZeroPunctuation. His 100th episode opened with him celebrating the event, complete with party hats and noisemakers. So, to commemorate the event, he reviews a very special game; Call of Juarez: Bound in blood. Which...is exactly the game he had scheduled anyway.
-->It's just a number. 101 is ''also'' a number. And so is 99, and at least that one looks like someone getting bumfucked.
** Later in the review, a sentence is abruptly interrupted by another noisemaker bursting out the side of Yahtzee's head, apropos of nothing. He just apologizes for the interruptiona nd goes on with what appears to be a bloodied ear.
** Then, two episodes later, he actually ''does'' review a game he really likes: ''SilentHill2''.
--->And what better game to celebrate my 102nd episode?! *noisemaker*
* ''WebAnimation/HowItShouldHaveEnded'' has a parody of ''Film/{{Titanic 1997}}'', the second highest-grossing movie of all time, as the 100th video.[[note]]The show already spoofed the #1 blockbuster, ''Film/{{Avatar}}'', a few years ealier.[[/note]]

* In the hundredth ''ComicStrip/TwistedToyfareTheatre'' strip, [[TonightSomeoneDies "Tonight, one of these characters will die!"]] Quoth Mego Spidey: "Hope it's me."
** Note that the characters themselves have a huge party to commemorate the event - but Reed Richards secretly confides in Spider-Man that this isn't actually the 100th strip, technically speaking, due to some miscellaneous strips featured in Toyfare's sister magazines like ''Wizard'' and ''Inquest Gamer''. As such, at the very end Spider-Man goes back in time to three issues ago and gives the huge cake from the party to the stars of the real 100th strip, the motley bunch of Stormtroopers.
* ''Webcomic/EightBitTheater'' never does anything special for its milestones, even for its 1000th. Although the titles do sometimes reference the number, such as "Episode 255: Maximum 8-bit Hexadecimal Value is FF. Coincidence?", "Episode 404: Comic Not Found", "Episode [[NumberOfTheBeast 666]]: Is Just Another Comic, Calm Down", "Episode 911: It's A Conspiracy", "Episode 912: For Real Emergencies", "Episode 913: The Last Of The 9XX Jokes", and "Episode 1000: I can't believe someone was asshole enough to make 1,000 sprite comics" followed by "Episode 1001: I can't believe someone was asshole enough to make more than 1,000 sprite comics".
* ''Webcomic/TheOrderOfTheStick'' was intended to have the group meeting Xykon on the hundredth strip, but the writer messed up the timing, and had one character [[LampshadeHanging complaining]] about it ("And I was expecting something impressive for the hundredth episode.") Every other hundredth was something special, though. The two hundredth was the very long battle with Miko, the 300th revealed Xykon's massed army, the four hundredth was a kiss between two major characters, the five hundredth was the start of Roy watching the rest of the Order, and the six hundreth is when the POV switched back to Roy, though they repeat the same "I thought there'd be something special..." joke from the 100th episode, and then [[LampshadeHanging hang a lampshade on it]]. However, the 700th and 800th comics had nothing particularly special about them, and it wasn't even lampshaded. Milestones returned with the next few hundred-counts. Strip #900 showed [[spoiler:a scene of another world beyond the rift sealed by Girard's (now destroyed) Gate]]. In Strip #1000, [[spoiler:vampire Durkon declared himself to be the representative of the death goddess Hel and tipped the divine vote toward destroying the world before the Snarl escaped]].
* ''[[OneOverZero 1/0]]'', in addition to ending with comic #1000, dedicated comic #251 to its "1000th panel" celebration.
* ''Webcomic/MegaTokyo'' used its comic #1000 to show Kimiko having a critical part of the nature of the world around her revealed to her, and revealed Miho's LittleMissBadass status in strip #1024 (#1 KB). And comic [[LeetSpeak 1337]] is triple length, showing an ImageSpot of Largo ammasing an army of Ph33rb0ts.
* ''Webcomic/CaptainSNES'' managed to work its [[http://www.captainsnes.com/2002/09/26/200-blue-dragon-part-9-fourth-wall-whats-that-2/ 200th story comic]] celebration into the plot. The [[http://www.captainsnes.com/2005/10/20/500-on-the-bright-side-think-of-the-ratings/ 500th]] was slightly clumsier.
* ''Webcomic/{{Narbonic}}'' had [[http://www.webcomicsnation.com/shaenongarrity/narbonic/series.php?view=archive&chapter=9864 this]] very silly one-year anniversary celebration.
* ''Webcomic/QuestionableContent'':
** #666: '''''[[http://questionablecontent.net/view.php?comic=666 Spontaneous metal interlude!]]'''''
** #1000 was titled [[http://questionablecontent.net/view.php?comic=1000 "Gratuitous Nudity!"]] The author apologized [[http://questionablecontent.net/view.php?comic=1003 three strips later]].
** And then there was [[http://questionablecontent.net/view.php?comic=1337 number 1337]].
* ''Webcomic/VGCats'' had a flash animation for the 100th comic, and actually skipped the 200th comic with a note reading "TBA 2009". Which now reads "TBA - Never".
* ''Webcomic/{{Adventurers}}'' had hundreds of comics numbered 999 so that the final chapter would be number 1000.
* ''Webcomic/AwkwardZombie'' has [[http://www.awkwardzombie.com/comic1-120808.php its 100th comic]], in which [[spoiler:Master Hand kills the [[BackForTheDead recently returned Roy]] [[DroppedABridgeOnHim in one hit]].]]
* ''Webcomic/SluggyFreelance'' includes a piece of simple animation every year on its anniversary (usually making someone dance to the song "X Years of Nifty Darn Comics"). The tenth anniversary featured this plus a bonus comic that referenced the "spam Satan" joke from the very first strip.
* ''Webcomic/DarthsAndDroids'' celebrates every 50th strip by adding another level to the string of "What our webcomic is in this universe, since the thing we're parodying doesn't exist" strips following [[http://www.darthsanddroids.net/episodes/0050.html the 50th strip]]. While [[http://www.darthsanddroids.net/episodes/1000.html the actual 1,000th strip]] has nothing worth celebrating (it's the beginning of Luke's adventure on Dagobah), [[http://www.darthsanddroids.net/arks/0050.html the accompanying alternate universe]] is based on Creator/GeorgeLucas's other famous franchise, ''Franchise/IndianaJones''.
* ''Webcomic/TheKamics'' is usually sarcastic about it's milestones, [[http://www.theduckwebcomics.com/The_KAMics/4788382/ comic #500 is a good example of this]].
* Every hundredth ''Webcomic/YetAnotherFantasyGamerComic'' strip is in color.
* The 200th comic of ''Webcomic/BrawlInTheFamily'' had a [[MusicalEpisode musical accompaniment]], dedicated to all the {{Mooks}} that [[WhatMeasureIsAMook died at the hands]] [[VideoGameCrueltyPotential of gamers everywhere]].
* ''Webcomic/{{XKCD}}'' skipped comic number 404, so that a 404 'File not found' error appears if someone tries to access it. And for the [[http://xkcd.com/1000/ 1000]]th comic, a binary joke: only 24 comics till a nice round number![[note]] 1024 is 10 000 000 000 in base two. The next binary milestone will be 100 000 000 000 (2048 comics), and at 4096 comics the total would be 1 000 000 000 000 in binary and 1 000 in hex.[[/note]]
* In honor of Website/PlatypusComix's 10th anniversary, accessing the site during the week of February 7, 2011 brought up a page which resembled the homepage used in 2001. Through the Wayback Machine, the page even included links to old comics and articles, as well as a dated homepage for Platypus Comix's parent site, Toon Zone. Clicking, "Click here to restore status quo" brought up the usual website, decked out with a vertically-oriented banner, which featured characters from both ongoing and discontinued comics partying together. And during the 10th anniversary of Toon Zone, Peter Paltridge released an ''Webcomic/ElectricWonderland'' comic in which the main characters find themselves in Toon Zone's domain while pursuing a thief.
* ''Webcomic/TheAdventuresOfDrMcNinja'': "[[http://drmcninja.com/archives/comic/4p32 Happy first anniversary]], Dr. [=McNinja=]!" It's a [[WhamEpisode Wham Strip]].
* ''Webcomic/ElGoonishShive'':
** The webcomic used to celebrate each year of the comic with a filler comic featuring the whole main cast. It stopped doing this after the 6th anniversary but acknowledged the 9th with [[http://www.egscomics.com/sketchbook/?date=2011-01-20 this filler]] which has links to previous milestone celebration comics.
** For the 10th anniversary, it celebrated with [[http://egscomics.com/sketchbook/?date=2012-01-21 a filler comic]] that mimics the setup and dialog of [[http://egscomics.com/?date=2002-01-21 the very first comic]] but is in color, features transformations, references the anniversary and has a different ending.
* ''Webcomic/SonicTheComicOnline'' celebrated the 250th issue of the series with a mega-packed issue. The issue is the largest so-far in the series, the online fancomics or the original ''ComicBook/SonicTheComic''; it also featured more artists in one issue then any other issue. It feature various cameos from characters that haven't appeared in a long time.
* ''ArthurKingOfTimeAndSpace'':
** Its first year endedwith [[http://www.arthurkingoftimeandspace.com/0365.htm the Battle of Beldegraine]] and [[http://www.arthurkingoftimeandspace.com/0366.htm Arthur learning who Morgan is]]. It ended its second year with [[http://www.arthurkingoftimeandspace.com/0731.htm a timetravel flashforward]]. The [[http://www.arthurkingoftimeandspace.com/1096.htm third]] and [[http://www.arthurkingoftimeandspace.com/1462.htm fourth]] aniversaries just get mentioned in passing, and the [[http://www.arthurkingoftimeandspace.com/1827.htm fifth aniversary]] is the pre-TimeSkip WhamEpisode. Sixth passed without comment (except in TheRant), and seventh wasn't even mentioned there.
** The AKOTAS characters also discuss whether they should celebate their [[http://www.arthurkingoftimeandspace.com/0300.htm three hundredth strip]] (the panel in the news section) and are shown celebrating in the [[http://www.arthurkingoftimeandspace.com/0500.htm five hundredth strip]]...because it's the aniversary of the first ''{{Peanuts}}'' strip. [[http://www.arthurkingoftimeandspace.com/2000.htm The two thousandth]] is the ''return'' from the TimeSkip.
* Played straight in ''Webcomic/SquareRootOfMinusGarfield'' in [[http://www.mezzacotta.net/garfield/?comic=1000 1000th Root of Minus Garfield]] and parodied in [[http://www.mezzacotta.net/garfield/?comic=1001 Party Like It's #999]] (the comic immediately afterwards).
* ''Webcomic/MountainTime'' celebrated its [[http://mountaincomics.com/2013/12/09/mountain-time-500/ 500th episode]] with an extended-length comic, followed by 25 more comics which, seemingly in defiance of the series' norm, were pretty much straight-up ContinuityPorn.
* ''[[http://www.keezees.com/ Keezees]]'' celebrates every 100th episode; episode 100 revealed the main character's surname; episode 200 took the form of an [[http://www.keezees.com/freebies/200.mp3/ MP3]] (warning: it's loud) which, when downloaded, recorded onto an audio cassette and played back on a ZX Spectrum, revealed episode 200 onscreen; and episode 300 was Keezees first colour episode; the author also ran a contest at that time where one lucky reader was [[http://www.keezees.com/cards/irina.jpg/ immortalised in Keezees trading card form.]]
* PlayedForLaughs on the [[http://l-empire.smackjeeves.com/comics/1717107/page-1000/ 1000th page]] ''Webcomic/LsEmpire'' when one of the characters tries to celebrate, only to be informed that it was technically only page 956 due to filler, title pages, and holiday specials. The actual 1000th page involved [[http://l-empire.smackjeeves.com/comics/1793244/sammer-kingdom-smackdown-pt-16/ trolling the audience]].

[[folder:Web Original]]
* There's the general case of "1 million hits", "1 million subscribers", etc. This usually has some celebration or special comment on sites that consider those relevant.
* For their 100th episode TalkRadar put together a six hour long podcast that was half original content, half clip-show.
* Most of the Website/ThatGuyWithTheGlasses team flew into Chicago to film the conclusion to the feud between WebVideo/TheNostalgiaCritic and WebVideo/TheAngryVideoGameNerd. The result was the [[WebVideo/TGWTGYearOneBrawl 1 Year Anniversary Brawl]] that pitted the site's critics (led by the Nostalgia Critic) against the site's gamers (led by the Angry Video Game Nerd). It has [[http://thatguywiththeglasses.com/videolinks/thatguywiththeglasses/nostalgia-critic/6719-1-year-anniversary-video to be seen]] for the [[CrowningMomentOfAwesome amount of awesome to be believed]].
** Celebrating the site's anniversary with a gigantic crossover is a traditional event. The second anniversary of the website featured the six-part miniseries ''WebVideo/{{Kickassia}}''. The third one had the seven-part web video ''WebVideo/SuburbanKnights'' with more effects and callbacks to ''Kickassia''. The fourth one was an eight-part film known as ''WebVideo/ToBoldlyFlee'', containing more continuity and improved CGI effects.
** [[WebVideo/AtopTheFourthWall Linkara]] (A part of That Guy With The Glasses) celebrated his 1 year anniversary by reviewing Maximum Clonage, a story from the infamous ''Comicbook/SpiderMan'' Clone War saga.
*** The 100th episode had him review a Franchise/SonicTheHedgehog comic book, (specifically Sonic Live!) one of his most requested comics to review.
*** And for the ''200th'' episode, he finally decided to rip into the one people have been clamoring for him to tear to shreds since the beginning. That's right, he finally went after ''ComicBook/OneMoreDay''.
*** For the 250th, he did a ''really'' bad Tandy Computer Whiz Kids PSA/advertising comic and got into an argument with the camera for using the "Merry Christmas from Atop the Fourth Wall" banner again instead of a 250th episode one, which led the mystery editor to crudely cross out the Christmas message and substitute the desired message without removing the snow or Jingle Bells. The real effort apparently went into the editing for one of his [[SanitySlippage Combine Harvester breakdowns]].
*** For the 300th episode, Linkara reviewed [[Creator/FrankMiller Frank Miller's]] ''Holy Terror'', which is another installment in "Miller Time". Linkara actually claimed that he hated ''Holy Terror'' more than any other comic he's reviewed and that it's the complete antithesis to everything he believes in. The episode's ending also features Linkara fighting his MirrorUniverse doppelganger, [[ContinuityCavalcade using various weapons and skills from the past 300 episodes]].
** Likewise, The Nostalgia Critic celebrated his 100th episode by...[[SubvertedTrope showing a half-assed clip show featuring a scene from his Captain Planet review]]. [[DoubleSubversion But said clip show argued with him, forcing him into reviewing]] ''Film/BattlefieldEarth.''
** Subverted with his 300th episode. He (clipless) reviewed ''Film/TheForceAwakens'' with Brad but it was pretty lowkey. Mentioned because his ''299''th episode, ''Film/ChristmasWithTheKranks'', was a ContinuityPorn WhamEpisode.
** For her third year anniversary of being on the site, [[WebVideo/TheNostalgiaChick Lindsay]] did an in-depth commentary on her first ever review, ''Disney/{{Pocahontas}}''.
** The Angry Video Game Nerd himself had a special episode as his 100th. ''Action 52''? No. ''NintendoWorldChampionships''? No. It's about [[NintendoEntertainmentSystem R.O.B.]] For the 10th anniversary of the show, the AVGN reviewed the Desert Bus minigame on ''VideoGame/PennAndTellersSmokeAndMirrors'', as well as the ''VideoGame/CastlevaniaIISimonsQuest'' hack, ''Castlevania II: Simon's Quest Redaction''.
** The AVGN's 10-year anniversary video[[note]]This considers the upload date of episode 3 ''and'' the date the channel was created, which is immediately displayed in the beginning of the video[[/note]] starts with him reflecting how [[TechnologyMarchesOn technology has advanced the past 10 years]]--PlayedForLaughs, of course (it took him ten years to get an HDTV). He then proceeds to review several ''Franchise/MegaManClassic'' and ''Franchise/MegaManX'' games. Halfway through, he claims to be quitting, and suddenly he finds himself travelling through AVGN history. The Nerd and his past self then end up reviewing the SoBadItsGood ''Mega Man'' DOS games, ''VideoGame/MegaManLegends'' and ''VideoGame/MegaManX7''.
** Generally, critics on TGWTG treat their 50th and 100th reviews as such- [[WebVideo/BrowsHeldHigh Kyle]] reviewed Melancholia, and JesuOtaku reviewed the FMA Anime, for instance.
* The 100th Episode of WereAlive was accompanied by a revamp of the show's website, launching a new iPhone app for downloading the podcast and new merchandise in the online store. In story the episode ended with the [[NuclearOption destruction]] of [[spoiler: the safe-zone in Boulder.]]
* WebVideo/EatYourKimchi: The 200th video was ''A Day in the Life'' and the 100th Music Monday had an 18 minute "best of" compilation video.
* ''WebVideo/GameGrumps'' downplays this in TheStinger to the hundredth ''[[VideoGame/SonicTheHedgehoog2006 Sonic 2006]]'' episode, wherein Arin briefly mentions it.
* WebVideo/GloveAndBoots celebrated 100k subscribers by including [[LongList (almost) all of them in a two-and-a-half hour video!]]
* Screen Junkies celebrated the 100th edition of ''WebVideo/HonestTrailers'' by doing a trailer of ''Film/FiftyShadesOfGrey''.
* ''WebVideo/OliverHarpersRetrospectivesAndReviews'':
** He celebrated his 100th review by reviewing one of his favorite films, ''Film/{{Ghostbusters 1984}}''.
** Did reviews of ''Film/SupermanTheMovie'' and ''Film/StarTrekTheMotionPicture'' to celebrate their 35th Anniversaries.
* ''[[LetsPlay/TacoMan Taco-Man Plays a Video Game]]'':
** Taco-Man celebrated 50 episodes with the [[https://www.youtube.com/watch?v=GFQ9u_FdxQk 50th Episode Craptacular]], in which he tried to re-play some of the games he reviewed before.
** The 60th episode, ''VideoGame/{{Zelda II| The Adventure of Link}}'', had Taco-Man announce the number to an unfazed Princess Zelda in the middle of the video.
** The 75th episode has Taco-Man play a game about himself, a 2006 parody of ''VideoGame/NightTrap''.
* [[Website/FourChan 4chan]]'s /v/ board celebrated its 300 ''millionth'' post, which was a photo of one of the amiibo costumes in ''VideoGame/{{Splatoon}}'', followed by "Splatoon is new meme", by giving it a sticky, and then '''[[ShootTheShaggyDog publicly banning the post]]'''.[[note]]The ban was for 14 days.[[/note]]
* To celebrate the third anniversary of ''Blog/AskKingSombra'', the author of the blog did an animation of Sombra singing "Up There" from ''WesternAnimation/SouthParkBiggerLongerAndUncut'', with {{Call Back}}s galore.

[[folder:Western Animation]]
* ''WesternAnimation/TheSimpsons'':
** The series had a special 300th episode...sorta. "Barting Over" was actually the 302nd episode, but Fox insisted on a special event episode to coincide with the Daytona 500. Nothing too special about the episode itself, other than guest shots by Tony Hawk and Blink 182, but there is a gag where Lisa mentions that this is the 300th time that Homer has done something crazy with Marge saying she counted 302.
** Its 500th episode had a couch gag that showed all the previous 499 couch gags, all continuing to pan skyward as they play out until it stops with the multiple incarnations of the family sitting at their couch, forming a mosaic "500". In addition, the chalkboard gag is Milhouse writing "Bart's earned a day off" and the opening logo includes a caption declaring "The most meaningless milestone of all!", referencing the chalkboard gag from the 100th episode. Also, Lisa's playing a sousaphone for some reason. The gag for the 499th episode was a surprise 500th episode party. When Lisa points out the error, Moe replies, "Well, guess what? Fox isn't doing this again."
** They also spoofed their actual 100th episode -- all they did was have Bart write the lines "I will not celebrate meaningless milestones."
** The 400th episode, "You Kent Always Say What You Want", opens with ''The Tracey Ullman Show'' short "Family Portrait".
** They also parodied this trope with "''The Simpsons'' 138th Episode Spectacular", the third ClipShow episode.
** Episode 167 was the episode that tied the show with ''TheFlintstones'' as the longest-running animated prime time show. "The Itchy & Scratchy & Poochie Show" featured a lot of LampshadeHanging on various AnimationTropes. Some versions of the episode use the couch gag where the family find the Flintstones already sitting there.
** The 20th anniversary was marked with the documentary ''The Simpsons 20th Anniversary Special: [[NeverTrustATitle In 3-D! On Ice!]]'', directed by longtime fan Morgan Spurlock (''Film/SuperSizeMe'') and broascast on January 10, 2010, following the 451st episode (which Fox promoted as the 450th for whatever reason; had they not promoted it as such, the documentary would have aired on January 14, the original broadcasting date of "Bart the Genius").
** Their 550th episode has Springfield reimagined as [[Franchise/{{Lego}} LEGOs]]. Notably, the LEGO aspect was promoted and not the episode count. And a contest was held for fans to introduce a new character to the show. The winning entry was Ricardo Bomba, a South American ladies' man who works as a safety inspector at the nuclear power plant. The episode where he made his debut killed him off before anything could be established about him. However, executive producer Al Jean [[WordOfGod said it's possible Ricardo might appear again]].
** Spoofed in-story in "I Love Lisa" with ''The Krusty the Klown 29th Anniversary Show''.
* ''WesternAnimation/SouthPark's'' 97th episode "Canceled" was clearly intended to be the 100th (with the LeaningOnTheFourthWall moment and all), but it was instead aired as the 97th so as to be the Season 7 premier, taking advantage of its MindScrew opening that mirrored the PilotEpisode. The actual 100th episode, "I'm A Little Bit Country", had a tacked-on "100 episodes" acknowledgement at the end.
** The 200th episode is the first of a two-parter and features a story involving ''every celebrity the town has ever pissed off''; the second part is also a WhamEpisode for Cartman: [[spoiler:His ''true'' father is also '''Scott Tennorman's''']].
* Spoofed in the ''WesternAnimation/LooneyTunes'' short "Blooper Bunny", which celebrates Bugs Bunny's 51 1/2 anniversary with a brief dancing number. Most of the cartoon is behind-the-scenes footage and HilariousOuttakes of said dance number.
* Spoofed in ''WesternAnimation/{{Animaniacs}}'', with the Warners' 65th Anniversary Special (referring to their backstory of being created in TheThirties). In actuality, this was the 65th ''episode'' and first season finale. In a more literal sense, the direct-to-video movie ''Wakko's Wish'' is essentially the show's 100th episode and series finale.
* ''WesternAnimation/FamilyGuy'':
** The 100th episode (excluding the splitting of the DVD movie into seperate episodes for broadcasting) was ''Stewie Kills Lois'', kicking off a two-parter in which Stewie finally realizes his ambition to kill his mother and conquer the world...[[AllJustADream or so it seems]].
** The 150th episode was an experimental story called ''Brian and Stewie'' in which only the two title characters appear, the entire episode is confined to a single scene, and there are no cutaway gags or even music.
** The 200th episode, [[BackwardsName "Yug Ylimaf"]], involves Stewie and Brian accidentally reversing time and revisiting moments from older episodes.
* ''WesternAnimation/{{SpongeBob SquarePants}}''' 10th anniversary special is an hour long and features live action appearances by Will Ferrell, Creator/CraigFerguson, Tina Fey, Rosario Dawson, [=LeBron=] James, P!nk, and Creator/RobinWilliams. And Ricky Gervais was the narrator. The plot for the episode itself is that the Krusty Krab is celebrating its eleventyseventh anniversary. This prompts the characters to reminisce, only instead of a standard ClipShow, the flashbacks are all new.
* ''WesternAnimation/TheFairlyOddParents'' 100th episode was the final part of the BigDamnMovie "WesternAnimation/{{Wishology}}". Plus, for it's 10th anniversary celebration, a [[LiveActionAdaptation live-action movie]], "''Film/AFairlyOddMovieGrowUpTimmyTurner''", was released, in which we see the characters [[TwentyMinutesintotheFuture 13 years in the future]].
* While the series itself never reached 100 episodes (unless you count ''Series/DemashitaPowerpuffGirlsZ''), ''WesternAnimation/ThePowerpuffGirls'' had a 10th anniversary special years after the show ended, which celebrated everything fans loved about the show compressed into 25 minutes. That would be wordplay, self-referential humor, homages & parodies, wit, and the occasional song.
* ''WesternAnimation/TurtlesForever'', a celebration of 25 years of the Franchise/TeenageMutantNinjaTurtles that also serves as both a GrandFinale for [[WesternAnimation/TeenageMutantNinjaTurtles2003 the 2003 series]] ''and'' a fitting send-off to the Mirage era of the franchise as a whole, what with it being sold to {{Nickelodeon}} shortly before its airing. Also, the 100th episode of the [[WesternAnimation/TeenageMutantNinjaTurtles2003 2003 series]] is a special episode depicting the story of Master Splinter's owner Master Hamato Yoshi.
* Spoofed on ''WesternAnimation/KaBlam''. The show is all set for its 100th episode, complete with a stadium, dancers, red carpet, fancy dress, etc. Then, maybe thirty seconds after the show starts, a stagehand tells Henry and June that it's only the 24th episode. Unfortunately, it was the 17th episode aired on Nickelodeon.
* ''WesternAnimation/{{Futurama}}'''s 100th episode is another spin on the RMS Titanic tragedy (this was [[RecycledPremise done before]] in the show's 10th episode, which featured a spaceship version of the cruiser as its main setting, but this episode uses a "Land Titanic" for its backstory), but nonetheless shook up the status quo a bit by having Leela's heritage as a mutant accidentally outed, [[spoiler:giving the mutants equal rights]], and even pulling a LikeYouWouldReallyDoIt by making it look as if Fry [[spoiler:mutated himself]]. And of course, the LeadIn for this episode is the Planet Express crew making their 100th delivery, and the party celebrating it serves as a minor B-plot.
* ''WesternAnimation/AmericanDad'' begins its 100th episode with Roger dressed as the Grim Reaper, telling viewers that to celebrate the milestone, they're going to kill off 100 characters. There's even an on-screen counter to keep track of the deaths. The show keeps its promise, though 96 of those deaths belong to background characters who are killed all at once in a bus crash.
* ''WesternAnimation/AquaTeenHungerForce''[='=]s 100th episode paid homage to WesternAnimation/ScoobyDoo, and also features a subplot of Master Shake visiting the show's executives (in the form of Dana Snyder, no less), trying to bring the show into UsefulNotes/{{syndication}}. However, since the show is only a QuarterHourShort, it only has fifty half-hours of material.
* The 100th episode of ''WesternAnimation/RegularShow'', "A Bunch of Full-Grown Geese", is full of {{call back}}s, starting with the return of the baby ducks from "A Bunch of Baby Ducks" (which is also alluded to in the episode's title). Later, when [[spoiler:Mordecai, Rigby and the ducks merge into a HumongousMecha]], various items from previous episodes (the magic keyboard from "The Power", the trucker hat from "Eggcelent", etc.) make an appearance.
* The 100th episode of ''WesternAnimation/TotalDrama'', "Zeke and Ye Shall Find", has all the current competitors going up against Ezekiel -- the first contestant ever eliminated from the show.
* For ''WesternAnimation/TheLegendOfKorra'', there's the episode "Venom Of The Red Lotus". Not only is it the 39th episode in this show, but it's also the 100th episode in the entire ''Franchise/AvatarTheLastAirbender'' franchise. The episode ends with [[spoiler:Jinora becoming the first master Airbender in the newly-remade Air Nomads, having shaved her head and looking just like her grandpa Aang]].
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
** The Season 3 finale, "[[Recap/MyLittlePonyFriendshipIsMagicS3E13MagicalMysteryCure Magical Mystery Cure]]", and ''[[WesternAnimation/MyLittlePonyEquestriaGirls Equestria Girls]]'' were released in 2013, in celebration of the 30th anniversary of the ''Franchise/MyLittlePony'' franchise.
** The 100th episode, actually titled "[[Recap/MyLittlePonyFriendshipIsMagicS5E9SliceOfLife Slice of Life]]", is a LowerDeckEpisode starring a good number of [[EnsembleDarkhorse minor and background characters that exploded with the fans]], while the main cast only appears in the background. The creators admitted it was written as a love letter to the fans who helped keep the show going.
** The season 5 episode "[[Recap/MyLittlePonyFriendshipIsMagicS5E19CrusadersOfTheLostMark Crusaders of the Lost Mark]]" premiered exactly five years after the premiere of [[Recap/MyLittlePonyFriendshipIsMagicS1E1MareInTheMoon the first episode of the series]]. It ended with [[spoiler:the Cutie Mark Crusaders finally earning their cutie marks and their series-long [[ArchEnemy nemeses]] Diamond Tiara and Silver Spoon pulling a HeelFaceTurn]].
* Creator/CartoonNetwork's 20th [[MomentOfAwesome anniversary celebration]]. They temporarily re-aired episodes of many of their classics, brought in a set of bumpers featuring numerous {{Crossover}}s, and then there was [[WhatDoYouMeanItWasntMadeOnDrugs the rather psychedelic]] [[https://vimeo.com/50597841 music video]] and [[http://i.imgur.com/dVmxhnN.jpg poster]], featuring over a hundred characters from nearly every cartoon ever shown on CN.
* ''Franchise/{{Ben 10}}'':
** The 100th episode of the franchise is fairly episodic in nature with not one {{Callback}} in the entire thing. In fact, it only stands out because it's one of the few episodes that has a DownerEnding.
** The 199th and 200th episodes (In production order) of the franchise deal with a time traveling VillainTeamUp that has a group of evil Bens ready to defeat and conquer every universe. Ben is joined by other alternate versions of himself (A few of them had already been stablished way back in the first series) and has a [[TheReveal reveal]] that [[spoiler:Ben got the Omnitrix because a version of him that never obtained it, along with Paradox, manipulated the events of the [[Recap/Ben10S1E1AndThenThereWereTen first episode]]]].
* Attempted in ''WesternAnimation/TheBookOfPooh'' when the storybook the series is set in reaches its 100th page. Pooh and the rest want to celebrate that, but by the time they were ready, the book has advanced to page 110.
* The 2012/2013 ''WesternAnimation/PeterRabbit'' series coproduced with Nickelodeon and Cbeebies debuted on the 110th/111th anniversary of the original ''Literature/TheTaleOfPeterRabbit'' in 1902.