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*** 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. Also, nearly every episode of the season that preceded "The Day of the Doctor" featured a plot or characters related to the long history of the series, as did the episode that immediately followed a few weeks later, the 2013 Christmas special, "The Time of the Doctor", which resolved a 37-year-old plot thread, an 8-year-old plot thread, a 3-year-old plot thread, and introduced a new Doctor, to boot.
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*** 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 for the next 50 years to come; rest of the show's Creator/StevenMoffat era; "Film/AnAdventureInSpaceAndTime", a docudrama about the creation of the show, and "[[Recap/TheFiveishDoctorsReboot The Five(ish) Doctors Reboot]]", a parody ReunionShow short feature. Also, nearly every episode of the season that preceded "The Day of the Doctor" featured a plot or characters related to the long history of the series, as did the Creator/MattSmith's GrandFinale episode that immediately followed a few weeks later, the 2013 Christmas special, "The "[[Recap/DoctorWho2013CSTheTimeOfTheDoctor The Time of the Doctor", Doctor]]", which resolved a 37-year-old plot thread, an 8-year-old plot thread, a 3-year-old plot thread, and introduced a new Doctor, to boot.
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** ''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]].
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** ''Doctor Who Magazine'' celebrated its 20th anniversary (issue 283, 1999) with "TV Action!", a {{metafiction}}al RealWorldEpisode 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]].
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** The first two Third Doctor season Blu-ray box sets were released on milestone dates: Season 10 on July 8, 2019, the centenary of Creator/JonPertwee's birth, and the Master's FirstAppearance Season 8 in March 2021, 50 years since its original run on January-June 1971.
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* On the other side of the Pacific, you have ''Franchise/SuperSentai'':
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* On the other side of the Pacific, you have ''Franchise/SuperSentai'':
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** 30th series: ''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.]]
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** 30th series: ''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.]]]] More subtly, every MonsterOfTheWeek design in the series is an homage in aesthetical terms to a past ''Sentai'' HumongousMecha.
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** 45th series: ''Series/KikaiSentaiZenkaiger'', which will introduce TheMultiverse of ''Super Sentai'', have the heroes channeling powers of previous Ranger teams albeit to a lesser extent than ''Gokaiger'', and be set on BreakingOldTrends - in this series, four of the HumongousMecha ''are'' the Rangers, able to shift between human size and mecha size at will, and they're more explicit homages to past ''Sentai'' mecha than the ''Boukenger'' monsters.
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*** 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 Creator/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 ''OOO'' characters breaking the Fourth Wall to film their own movie adaptation of the original ''Kamen Rider'' while a villainous {{Mook|s}} from that series attempts to restore his old organization Shocker to its former glory. Plus both episodes featured cameos from prior actors that had the kanji "千" ("chi", meaning "thousand") [[PunnyNames in their names).
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*** 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 Creator/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 ''OOO'' characters breaking the Fourth Wall to film their own movie adaptation of the original ''Kamen Rider'' while a villainous {{Mook|s}} from that series attempts to restore his old organization Shocker to its former glory. Plus both episodes featured cameos from prior actors that had the kanji "千" ("chi", meaning "thousand") [[PunnyNames in their names).names]].
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*** 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 Creator/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''.
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*** 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 Creator/ShotaroIshinomori's non-''Kamen Rider'' {{toku}} heroes intercepting and quickly killing off a retreating [[Series/KamenRiderStronger General Shadow]].]] 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 ''OOO'' characters breaking the Fourth Wall to film their own movie about adaptation of the original ''Kamen Rider''.Rider'' while a villainous {{Mook|s}} from that series attempts to restore his old organization Shocker to its former glory. Plus both episodes featured cameos from prior actors that had the kanji "千" ("chi", meaning "thousand") [[PunnyNames in their names).
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** 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.
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** 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 the [[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.
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** The 2018-19 season, ''Series/KamenRiderZiO'', is not only the 20th Heisei season, but the ''last'' Heisei season due to Emperor Akihito abdicating the throne and ending Japan's Heisei era. As a result, ''Zi-O'' is a CrisisCrossover similar to ''Decade'' involving all 20 Heisei shows as the era's GrandFinale. The series also followed in ''Gokaiger''[='s=] footsteps by getting actors from all the other Heisei seasons for {{Cameo}}s, managing to get 11 of the 19 main Riders to appear in person[[note]]''Fourze'''s Souta Fukushi couldn't appear in the flesh because he was tied up filming ''Film/{{Bleach}}'', but he was able to record voiceovers that were used along with a FakeShemp dressed in Gentaro's costumes[[/note]], some of them for the first time in years.
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** The 2018-19 season, ''Series/KamenRiderZiO'', is not only the 20th Heisei season, but the ''last'' Heisei season due to Emperor Akihito abdicating the throne and ending Japan's Heisei era. As a result, ''Zi-O'' is a CrisisCrossover similar to ''Decade'' involving all 20 Heisei shows as the era's GrandFinale. The series also followed in ''Gokaiger''[='s=] footsteps by getting actors from all the other Heisei seasons for {{Cameo}}s, managing to get 11 of the 19 main Riders to appear in person[[note]]''Fourze'''s person,[[note]]''Fourze'''s Souta Fukushi couldn't appear in the flesh because he was tied up filming ''Film/{{Bleach}}'', but he was able to record voiceovers that were used along with a FakeShemp dressed in Gentaro's costumes[[/note]], costumes[[/note]] some of them for the first time in years.
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* 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.
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* 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. [[spoiler:It's also notably the ''only'' time Kaga himself voted, in order to break a tie.]]
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** While ''Ninninger'' celebrated the 40th ''year'' of the franchise, ''Series/DoubutsuSentaiZyuohger'' was the 40th ''installment''; and the franchise also hit 2,000 total episodes that season. The show celebrated both by bringing back the Gokaigers for episodes 1,999 and 2,000.
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** While ''Ninninger'' celebrated the 40th ''year'' of the franchise, ''Series/DoubutsuSentaiZyuohger'' was the 40th ''installment''; and the franchise also hit 2,000 total episodes that season. The show celebrated both by bringing back the Gokaigers for episodes 1,999 and 2,000.2,000, where ''Zyuohger''[='s=] Red Ranger gained his SuperMode. The DVD releases also included special {{Bonus Episode}}s featuring [=AkaRed=] returning once again to teach the Zyuohgers about ''Sentai'' history.
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* For its 10th and 20th seasons, ''Series/{{Survivor}}'' brought back players from previous seasons to play again (though they sometimes also do so when it's ''not'' a milestone).
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* For its 10th 10-year/Season 20 and 20th seasons, 20-year/Season 40 anniversaries (due to airing biannually), ''Series/{{Survivor}}'' brought back players from previous seasons to play again (though they sometimes also do so when it's ''not'' a milestone).
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** On their 30th birthday (1993), Tsuburaya created the film ''Ultraman Zearth'', another AffectionateParody of the franchise.
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** On their 30th birthday (1993), Tsuburaya created the film ''Ultraman Zearth'', ''Film/UltramanZearth'', another AffectionateParody of the franchise.
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No longer a trope per TRS
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** The fiftieth Literature/DoctorWhoNewAdventures novel is ''[[Recap/DoctorWhoNewAdventuresHappyEndings Happy Endings]]'' (1996) by Creator/PaulCornell, in which a new cover design 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 ''every NA writer except one''[[note]]Jim Mortimore[[/note]] contributes a paragraph to the reception.
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** The fiftieth Literature/DoctorWhoNewAdventures novel is ''[[Recap/DoctorWhoNewAdventuresHappyEndings Happy Endings]]'' (1996) by Creator/PaulCornell, in which a new cover design is introduced, [[WeddingDay [[WeddingEpisode Benny gets married]], [[ReunionShow a whole host of characters from previous novels are invited]], a lot of [[WhatHappenedToTheMouse dangling plot threads]] get resolved, and ''every NA writer except one''[[note]]Jim Mortimore[[/note]] contributes a paragraph to the reception.
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* For its 10th and 20th anniversaries (Seasons 20 and 40, due to airing bi-annually), ''Series/{{Survivor}}'' brought back players from previous seasons to play again (though they sometimes also do so when it's ''not'' an anniversary).
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* For its 10th and 20th anniversaries (Seasons 20 and 40, due to airing bi-annually), seasons, ''Series/{{Survivor}}'' brought back players from previous seasons to play again (though they sometimes also do so when it's ''not'' an anniversary).a milestone).
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** ''Series/Supergirl2015'': The 100th episode "It's a Super Life" features Mr. Mxyzptlk helping Kara deal with her guilt over not telling Lena her secret identity by showing her various {{Alternate Timeline}}s where she did so at various points in the show's run, allowing various prominent past characters to return temporarily.
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** ''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 [[BattleInTheCentreOfTheMind a battle inside the TARDIS' mind]].
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** ''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 [[BattleInTheCentreOfTheMind [[BattleInTheCenterOfTheMind a battle inside the TARDIS' mind]].
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* For its 10th and 20th anniversaries (Seasons 20 and 40, due to airing bi-annually), ''Series/{{Survivor}}'' brought back players from previous seasons to play again (though they sometimes also do so when it's ''not'' an anniversary).
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* ''Series/SesameStreet'':
** The first special, "A Walking Tour of Sesame Street," aired in the spring of 1979 to observe the show's 10th year. This was the first ClipShow, as Big Bird, Oscar the Grouch and Barkley the dog; human cast members Will Lee, Bob [=McGrath=], Linda Bove and Alania Reed; and SpecialGuest James Earl Jones all talked about the show, its impact and top storylines up to that point in the series' history.
** "Sesame Street: 20 and Still Counting" came in 1989 and aired on NBC. Hosted by Bill Cosby, the show's main human cast and Muppet characters all appeared, as did Kermit the Frog (whose appearances by now were increasingly rare). The two top storylines from the 1980s – the passing of Mr. Hooper and Snuff-a-Lupagus' revelation to the adults that he was indeed real – were also recounted, and the top original song from the show, "Sing" (composed by Joe Raposo, and made a worldwide hit by The Carpenters) was also included.
** "Sesame Steet Unpaved" was a documentary airing in 1999 and celebrating the show's 30th anniversary. Extended clips of notable storylines – the WelcomeEpisode where Gordon shows a young girl around the Street, Mr. Hooper's death, and the "Snuffy is real" episodes among them – are shown.
** "Sesame Street's 50th Anniversary Celebration," focusing on the show's cultural impact. Many of the longtime cast members joined their current stars, and Muppets that hadn't appeared for years were featured as the show celebrated its worldwide impact. The special marked the last appearance of Caroll Spinney, the longtime voice and Muppeteer behind Big Bird and Oscar, as he died less than a month after the special aired on HBO and PBS.
*** Not so much connected with the 50th anniversary milestone, but in December 2019 the ''Sesame Street'' became the first TV series to earn a Kennedy Center Honor (for its cultural and educational impact on America).
** Many other direct-to-video produtions, books and much more also helped observe these milestones.
** The first special, "A Walking Tour of Sesame Street," aired in the spring of 1979 to observe the show's 10th year. This was the first ClipShow, as Big Bird, Oscar the Grouch and Barkley the dog; human cast members Will Lee, Bob [=McGrath=], Linda Bove and Alania Reed; and SpecialGuest James Earl Jones all talked about the show, its impact and top storylines up to that point in the series' history.
** "Sesame Street: 20 and Still Counting" came in 1989 and aired on NBC. Hosted by Bill Cosby, the show's main human cast and Muppet characters all appeared, as did Kermit the Frog (whose appearances by now were increasingly rare). The two top storylines from the 1980s – the passing of Mr. Hooper and Snuff-a-Lupagus' revelation to the adults that he was indeed real – were also recounted, and the top original song from the show, "Sing" (composed by Joe Raposo, and made a worldwide hit by The Carpenters) was also included.
** "Sesame Steet Unpaved" was a documentary airing in 1999 and celebrating the show's 30th anniversary. Extended clips of notable storylines – the WelcomeEpisode where Gordon shows a young girl around the Street, Mr. Hooper's death, and the "Snuffy is real" episodes among them – are shown.
** "Sesame Street's 50th Anniversary Celebration," focusing on the show's cultural impact. Many of the longtime cast members joined their current stars, and Muppets that hadn't appeared for years were featured as the show celebrated its worldwide impact. The special marked the last appearance of Caroll Spinney, the longtime voice and Muppeteer behind Big Bird and Oscar, as he died less than a month after the special aired on HBO and PBS.
*** Not so much connected with the 50th anniversary milestone, but in December 2019 the ''Sesame Street'' became the first TV series to earn a Kennedy Center Honor (for its cultural and educational impact on America).
** Many other direct-to-video produtions, books and much more also helped observe these milestones.
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* ''Series/BrooklynNineNine'' treated the 99th episode like it was its 100th, and as such featured a more ambitious plot that involved Captain Holt being interviewed for a commissioner promotion that he'd wanted for the entire series, and the presinct going on a road-trip across the US in an attempt to get to the interview in time. It also featured a major reveal - namely, that Rosa Diaz [[spoiler: is a bisexual.]]
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* ''Series/BrooklynNineNine'' treated the 99th episode like it was its 100th, and as such featured a more ambitious plot that involved Captain Holt being interviewed for a commissioner promotion that he'd wanted for the entire series, and the presinct going on a road-trip across the US in an attempt to get to the interview in time. It also featured a major reveal - namely, that Rosa Diaz [[spoiler: is a bisexual.]]
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* ''Series/AmericanHorrorStory'' celebrated its 100th episode (simply titled "Episode 100", in contrast to the usual punny and/or otherwise indicative episode titles) at the midway point of its ninth season, subtitled ''[[Series/AmericanHorrorStory1984 1984]]''. Recent seasons of the show had developed something of a reputation for delivering a major format switch-up at the halfway point, and the details of the second half of the season (beginning with the hundredth episode) were kept strictly under wraps beforehand. [[spoiler:However, despite the build-up, the episode ended up functioning primarily as a bridge between the slasher movie send-up that was episodes 1-5 and the set-up for the reunion in episodes 7-10. The only real "surprise" was that the episode covers the years 1985-1989 - rendering the title of the season somewhat misleading.]]
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* 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.
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* As noted under ''Super Sentai'', the 30th anniversary of the ''Franchise/MetalHeroes'' ''Series/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.
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** 2016 celebrated the 45th Anniversary with ''Film/KamenRider1 the Movie'' (in place of the ''Superhero Taisen'' series), starring the [[Series/KamenRider original Kamen Rider]] and having him team up with the then-current show, ''Series/KamenRiderGhost''.
** The 2018-19 season, ''Series/KamenRiderZiO'', is not only the 20th Heisei season, but the ''last'' Heisei season due to Emperor Akihito abdicating the throne and ending Japan's Heisei era. As a result, ''Zi-O'' is a CrisisCrossover similar to ''Decade'' involving all 20 Heisei shows as the era's GrandFinale.
** The 2018-19 season, ''Series/KamenRiderZiO'', is not only the 20th Heisei season, but the ''last'' Heisei season due to Emperor Akihito abdicating the throne and ending Japan's Heisei era. As a result, ''Zi-O'' is a CrisisCrossover similar to ''Decade'' involving all 20 Heisei shows as the era's GrandFinale.
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** 2016 celebrated the 45th Anniversary with ''Film/KamenRider1 the Movie'' (in place of the ''Superhero Taisen'' series), starring the [[Series/KamenRider original Kamen Rider]] and having him team up with the then-current show, ''Series/KamenRiderGhost''.
''Series/KamenRiderGhost''. Afterwards Creator/HiroshiFujioka stated he would be retiring from the role, also making it the final appearance of Takeshi Hongo.
** The 2018-19 season, ''Series/KamenRiderZiO'', is not only the 20th Heisei season, but the ''last'' Heisei season due to Emperor Akihito abdicating the throne and ending Japan's Heisei era. As a result, ''Zi-O'' is a CrisisCrossover similar to ''Decade'' involving all 20 Heisei shows as the era's GrandFinale. The series also followed in ''Gokaiger''[='s=] footsteps by getting actors from all the other Heisei seasons for {{Cameo}}s, managing to get 11 of the 19 main Riders to appear in person[[note]]''Fourze'''s Souta Fukushi couldn't appear in the flesh because he was tied up filming ''Film/{{Bleach}}'', but he was able to record voiceovers that were used along with a FakeShemp dressed in Gentaro's costumes[[/note]], some of them for the first time in years.
** The 2018-19 season, ''Series/KamenRiderZiO'', is not only the 20th Heisei season, but the ''last'' Heisei season due to Emperor Akihito abdicating the throne and ending Japan's Heisei era. As a result, ''Zi-O'' is a CrisisCrossover similar to ''Decade'' involving all 20 Heisei shows as the era's GrandFinale. The series also followed in ''Gokaiger''[='s=] footsteps by getting actors from all the other Heisei seasons for {{Cameo}}s, managing to get 11 of the 19 main Riders to appear in person[[note]]''Fourze'''s Souta Fukushi couldn't appear in the flesh because he was tied up filming ''Film/{{Bleach}}'', but he was able to record voiceovers that were used along with a FakeShemp dressed in Gentaro's costumes[[/note]], some of them for the first time in years.
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* For ''Series/JimmyKimmelLive'''s 10th anniversary show in 2013, Creator/MattDamon, Creator/JimmyKimmel's SitcomArchNemesis, staged a HostileShowTakeover, renaming the show ''Jimmy Kimmel Sucks!''. Jimmy was tied up, gagged, and relegated to the background, while Matt interviewed various people who all proclaimed their hatred for Jimmy.
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** The teaser trailer for ''Series/StarTrekPicard'' was released on May 23, 2019, which was the 25th anniversary of ''Series/StarTrekTheNextGeneration'''s GrandFinale, "All Good Things".
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* The first half of ''Series/FullerHouse''[='=]s third season arrives on September 22, 2017 - exactly 30 years to the day its parent series ''Series/FullHouse'' premiered in 1987.
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* The first half of ''Series/FullerHouse''[='=]s third season arrives premiered on September 22, 2017 - exactly 30 years to the day its parent series ''Series/FullHouse'' premiered in 1987.
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*** ''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.
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*** ''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 their 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.
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** The 2018-19 season, ''Series/KamenRiderZiO'', happens to be the 20th Heisei season, the 10th season since ''Decade'', and by a remarkable coincidence, the last season to take place during the reign of Japanese Emperor Akihito (Heisei). As a result, this season is both this and the GrandFinale of the Heisei era.
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** The 2018-19 season, ''Series/KamenRiderZiO'', happens to be is not only the 20th Heisei season, but the 10th ''last'' Heisei season since ''Decade'', and by a remarkable coincidence, the last season due to take place during the reign of Japanese Emperor Akihito (Heisei). abdicating the throne and ending Japan's Heisei era. As a result, this season ''Zi-O'' is both this and the GrandFinale of the a CrisisCrossover similar to ''Decade'' involving all 20 Heisei era.shows as the era's GrandFinale.
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* 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.
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* In the 100th episode of ''Series/{{Charmed}}'', ''Series/{{Charmed|1998}}'', 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.
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** The 200th episode is a MusicalEpisode.
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** The 200th episode is a MusicalEpisode.MusicalEpisode, featuring a school musical created by in-universe fans of the [[ShowWithinAShow books about the Winchesters' adventures]].
** The 300th episode features John Winchester being brought forward in time from a point prior to his death, allowing for a brief family reunion before he has to be sent back to avert a TemporalParadox.
** The 300th episode features John Winchester being brought forward in time from a point prior to his death, allowing for a brief family reunion before he has to be sent back to avert a TemporalParadox.
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*** The 150th episode "Emerald Archer" features an InUniverse documentary about the vigilantes (and narrated by Creator/KelseyGrammar no less), which includes cameos from several characters long since departed from the show.
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*** The 150th episode "Emerald Archer" features an InUniverse documentary about the vigilantes (and narrated by Creator/KelseyGrammar Creator/KelseyGrammer no less), which includes cameos from several characters long since departed from the show.
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** ''Series/{{Arrow}}'': The 100th episode "Invasion!", is part of a four-part crossover with ''Series/TheFlash2014'', ''Series/LegendsOfTomorrow'', and ''Series/{{Supergirl 2015}}''. It also features call backs to nearly the entire series, the return of several characters, and a battle royale with Oliver and his friends vs illusory versions of several past villains.
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** ''Series/{{Arrow}}'': ''Series/{{Arrow}}'':
*** The 100th episode "Invasion!", is part of a four-part crossover with ''Series/TheFlash2014'', ''Series/LegendsOfTomorrow'', and ''Series/{{Supergirl 2015}}''. It also features call backs to nearly the entire series, the return of several characters, and a battle royale with Oliver and his friends vs illusory versions of several pastvillains.villains.
*** The 150th episode "Emerald Archer" features an InUniverse documentary about the vigilantes (and narrated by Creator/KelseyGrammar no less), which includes cameos from several characters long since departed from the show.
*** The 100th episode "Invasion!", is part of a four-part crossover with ''Series/TheFlash2014'', ''Series/LegendsOfTomorrow'', and ''Series/{{Supergirl 2015}}''. It also features call backs to nearly the entire series, the return of several characters, and a battle royale with Oliver and his friends vs illusory versions of several past
*** The 150th episode "Emerald Archer" features an InUniverse documentary about the vigilantes (and narrated by Creator/KelseyGrammar no less), which includes cameos from several characters long since departed from the show.
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*** TNG's fifth season, 1991-92, coincided with ''Star Trek'''s 25th anniversary. For this season, [[http://tng.trekcore.com/gallery/albums/openingcredits/s5/season5_048.jpg the show's logo had rear shadows]]. The two-part episode "Unification", airing in November 1991 and featuring Creator/LeonardNimoy as Spock, was created in conjunction with ''Film/StarTrekVITheUndiscoveredCountry'' (and Spock even references the events of the film) as part of ''Star Trek'''s 25th anniversary. The episodes were also dedicated to Creator/GeneRoddenberry, who passed away during their production.
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*** TNG's fifth season, 1991-92, coincided with ''Star Trek'''s Star Trek's 25th anniversary. For this season, [[http://tng.trekcore.com/gallery/albums/openingcredits/s5/season5_048.jpg the show's logo had rear shadows]]. The two-part episode "Unification", airing in November 1991 and featuring Creator/LeonardNimoy as Spock, was created in conjunction with ''Film/StarTrekVITheUndiscoveredCountry'' (and Spock even references the events of the film) as part of ''Star Trek'''s 25th anniversary. The episodes were also dedicated to Creator/GeneRoddenberry, who passed away during their production.
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** TNG's fifth season, 1991-92, coincided with ''Star Trek'''s 25th anniversary. For this season, [[http://tng.trekcore.com/gallery/albums/openingcredits/s5/season5_048.jpg the show's logo had rear shadows]].
*** The two-part episode "Unification", airing in November 1991 and featuring Creator/LeonardNimoy as Spock, was created in conjunction with ''Film/StarTrekVITheUndiscoveredCountry'' (and Spock even references the events of the film) as part of ''Star Trek'''s 25th anniversary. The episodes were also dedicated to Creator/GeneRoddenberry, who passed away during their production.
*** The two-part episode "Unification", airing in November 1991 and featuring Creator/LeonardNimoy as Spock, was created in conjunction with ''Film/StarTrekVITheUndiscoveredCountry'' (and Spock even references the events of the film) as part of ''Star Trek'''s 25th anniversary. The episodes were also dedicated to Creator/GeneRoddenberry, who passed away during their production.
to:
***
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*** The two-part "Unification", airing in November 1991 and featuring Creator/LeonardNimoy as Spock, was created in conjunction with ''Film/StarTrekVITheUndiscoveredCountry'' (and Spock even references the events of the film) as part of ''Star Trek'''s 25th anniversary. The episodes were also dedicated to Creator/GeneRoddenberry, who passed away during their production.
to:
** TNG's fifth season, 1991-92, coincided with ''Star Trek'''s 25th anniversary. For this season, [[http://tng.trekcore.com/gallery/albums/openingcredits/s5/season5_048.jpg the show's logo had rear shadows]].
*** The two-part episode "Unification", airing in November 1991 and featuring Creator/LeonardNimoy as Spock, was created in conjunction with ''Film/StarTrekVITheUndiscoveredCountry'' (and Spock even references the events of the film) as part of ''Star Trek'''s 25th anniversary. The episodes were also dedicated to Creator/GeneRoddenberry, who passed away during their production.
*** The two-part episode "Unification", airing in November 1991 and featuring Creator/LeonardNimoy as Spock, was created in conjunction with ''Film/StarTrekVITheUndiscoveredCountry'' (and Spock even references the events of the film) as part of ''Star Trek'''s 25th anniversary. The episodes were also dedicated to Creator/GeneRoddenberry, who passed away during their production.
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* ''Series/{{Arrow}}'': The 100th episode "Invasion!", is part of a four-part crossover with ''Series/TheFlash2014'', ''Series/LegendsOfTomorrow'', and ''Series/{{Supergirl 2015}}''. It also features call backs to nearly the entire series, the return of several characters, and a battle royale with Oliver and his friends vs illusory versions of several past villains.
* ''Series/MysteryScienceTheater3000'' had its 200th episode land in the Netflix's third episode ''The Time Travelers''. It was mentioned at the tail end of the episode by Kinga Forrester, who lampshades this that celebrating "false anniversaries" is important.
* ''Series/MysteryScienceTheater3000'' had its 200th episode land in the Netflix's third episode ''The Time Travelers''. It was mentioned at the tail end of the episode by Kinga Forrester, who lampshades this that celebrating "false anniversaries" is important.
to:
* The Series/ArrowVerse:
** ''Series/{{Arrow}}'': The 100th episode "Invasion!", is part of a four-part crossover with ''Series/TheFlash2014'', ''Series/LegendsOfTomorrow'', and ''Series/{{Supergirl 2015}}''. It also features call backs to nearly the entire series, the return of several characters, and a battle royale with Oliver and his friends vs illusory versions of several past villains.
** ''Series/TheFlash2014'': The 100th episode "What's Past is Prologue" features many {{Call Back}}s to previous episodes, through the narrative of Barry and [[KidFromTheFuture Nora]] having to run back to several points in the past in order to retrieve various components needed to make a weapon they believe will help defeat current BigBad Cicada.
* ''Series/MysteryScienceTheater3000'' had its 200th episode land in the Netflix's third episode ''The Time Travelers''. It was mentioned at the tail end of the episode by Kinga Forrester, who lampshadesthis that celebrating "false anniversaries" is important.
** ''Series/{{Arrow}}'': The 100th episode "Invasion!", is part of a four-part crossover with ''Series/TheFlash2014'', ''Series/LegendsOfTomorrow'', and ''Series/{{Supergirl 2015}}''. It also features call backs to nearly the entire series, the return of several characters, and a battle royale with Oliver and his friends vs illusory versions of several past villains.
** ''Series/TheFlash2014'': The 100th episode "What's Past is Prologue" features many {{Call Back}}s to previous episodes, through the narrative of Barry and [[KidFromTheFuture Nora]] having to run back to several points in the past in order to retrieve various components needed to make a weapon they believe will help defeat current BigBad Cicada.
* ''Series/MysteryScienceTheater3000'' had its 200th episode land in the Netflix's third episode ''The Time Travelers''. It was mentioned at the tail end of the episode by Kinga Forrester, who lampshades
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* As a LongRunner, ''Series/DoctorWho'' and its [[Franchise/DoctorWhoExpandedUniverse Expanded Universe]] 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 (unless you count him getting a spiffy new TARDIS console).
** 1985 saw the 100th [[Literature/DoctorWhoNovelisations Target novelisation]], Creator/RobertHolmes' adaptation of his TV story "[[Recap/DoctorWhoS22E4TheTwoDoctors The Two Doctors]]", with an introduction by Creator/JohnNathanTurner, 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".
*** The Literature/DoctorWhoNewAdventures marked the anniversary with a story arc running from October 1993 to February 1994 and featuring a number of old villains and monsters from the TV series appearing in the novels for the first time.
*** ''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 ''[[Recap/DoctorWhoNewAdventuresHappyEndings Happy Endings]]'' (1996) by Creator/PaulCornell, in which a new cover design 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 ''every NA writer except one''[[note]]Jim Mortimore[[/note]] contributes a paragraph to the reception.
** ''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 [[BattleInTheCentreOfTheMind 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.
*** [[ComicBook/DoctorWhoIDW IDW comics]]: "ComicBook/DoctorWhoTheForgotten", 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. Also, nearly every episode of the season that preceded "The Day of the Doctor" featured a plot or characters related to the long history of the series, as did the episode that immediately followed a few weeks later, the 2013 Christmas special, "The Time of the Doctor", which resolved a 37-year-old plot thread, an 8-year-old plot thread, a 3-year-old plot thread, and introduced a new Doctor, to boot.
*** 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: [[Literature/DoctorWho11Doctors11Stories 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.
*** ''Doctor Who Magazine'' 467, which featured "John Smith and the Common Men", also came with a special mini-magazine showing what DWM might have looked like in 1964, marking the show's first anniversary, and collectible art cards of the First through Twelfth Doctors (leaving out War).
*** 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, [[Creator/IDWPublishing 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.
** ''Doctor Who Magazine'' marked its 500th issue in 2016 with the comic "The Stockbridge Showdown", pitting the Twelfth Doctor and [[ReunionShow most of the living DWM-original companions]] against one of the strip's major villains in a finale to a long-AbortedArc, a bonus magazine covering DWM's history, a double-sided poster, the first of nine collectible art cards, and a sheet of stickers (calling back to DWM's first issue, back when it was ''Doctor Who Weekly'', which came with transfers).
* 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 UsefulNotes/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.
*** The show celebrated its 25th, 30th, and 35th Anniversaries with a primetime special. The first (#0001S) used the half-hour format, with the other half filled with clips; the second (#0001LV) was taped in Las Vegas, using the regular format; the third (#023SP) also celebrated Bob Barker's 50 years in television, with a similar format as the 25th-Anniversary Special and a cameo by Creator/AdamSandler.
*** During the first week of the 40th season, there was a 40th Anniversary Special, in which the audience consisted ''entirely'' of past contestants who were invited back to play again. One player, Paul Levine, who was the first player to play "Bonus Game" on the pilot episode, played that same game again, winning a restored 1972 Chevrolet Camaro, the same car he'd originally won in the pilot.
** ''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.
*** For the Trebek version's 10th season, there was a Tenth Anniversary Tournament featuring players from each of the show's first 9 seasons, giving the season 9 slot to Tom Nosek, the then-newest Tournament of Champions winner). The tournament was won by season 6's Frank Spangenberg ([[SugarWiki/MomentOfAwesome after a major turnaround in the final games]]).
** ''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 [[AbsenteeActor 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 Creator/LeVarBurton, who also directed the episode.
** ''Series/StarTrekTheNextGeneration'':
*** The series' 80th episode produced, "Legacy", surpassed TOS' total of 79[[note]]though that is based on counting TNG's PilotMovie as two episodes, which the production numbers for the series did; in addition, the TOS two-parter "The Menagerie" is considered a single episode for production purposes, since it incorporated nearly the entirety of the first, unaired pilot, "The Cage", and the new footage was produced under the timeframe and budget of a single episode[[/note]] had the ''Enterprise'' be forced to bypass a scheduled stop at Camus II, the planet where "Turnabout Intruder", the TOS finale, took place.
*** The series' 100th episode, ''Redemption'', was the fourth-season {{Cliffhanger}}. It was a key episode in Worf's arc, marked the beginning of a Klingon civil war, and ended on TheReveal of Romulan Commander Sela, [[WhamShot a dead ringer for the late Tasha Yar]][[note]]confirmed in the next episode as the daughter of the alternate Tasha from "Yesterday's Enterprise"; [[IdenticalGrandson both characters played by Denise Crosby]][[/note]].
*** The two-part "Unification", airing in November 1991 and featuring Creator/LeonardNimoy as Spock, was created in conjunction with ''Film/StarTrekVITheUndiscoveredCountry'' (and Spock even references the events of the film) as part of ''Star Trek'''s 25th anniversary. The episodes were also dedicated to Creator/GeneRoddenberry, who passed away during their production.
* ''Series/BuffyTheVampireSlayer'':
** The 100th episode coincided 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. Further, 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'':
** 10-year anniversary: "Forever Red" in ''Series/PowerRangersWildForce''. 10 years of Red Rangers returned for a fight against TheRemnant of [[Series/PowerRangersZeo the Machine Empire.]]
** 500th episode - "Legacy of Power" in ''Series/PowerRangersDinoThunder'', 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.
** 15-year anniversary: "Once A Ranger" in ''Series/PowerRangersOperationOverdrive'', a two-parter which had some of the more popular (non-Red) Rangers return for another fight.
** 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.)
** 25-season anniversary: "Dimensions in Danger" in ''Series/PowerRangersNinjaSteel'', another big ReunionShow involving TheMultiverse and Rangers from across the entire franchise.
* On the other side of the Pacific, you have ''Franchise/SuperSentai'':
** An odd case: ''Series/KousokuSentaiTurboranger'' was launched as the then-eleventh show (tenth anniversary) of ''Super Sentai''. 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.
** 25th series: a 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]]. The movie ends with ''every'' previous Red Ranger showing up, albeit in costume only.
** 30th series: ''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.]]
** 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. This is acknowledged in the movie's ending when the heroes celebrate a birthday party, and calling it "a Super Sentai birthday". Afterwards, theatrical releases for reunion movies became the norm.
** 35th series: ''Series/KaizokuSentaiGokaiger'', the Sentai equivalent of ''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 the two Red Rangers of the past ninja series, ''Series/NinjaSentaiKakuranger'' and ''Series/NinpuuSentaiHurricaneger'', guest star in Episode 7; plus an additional cameo by Akaranger from ''Goranger''. 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.
** While ''Ninninger'' celebrated the 40th ''year'' of the franchise, ''Series/DoubutsuSentaiZyuohger'' was the 40th ''installment''; and the franchise also hit 2,000 total episodes that season. The show celebrated both by bringing back the Gokaigers for episodes 1,999 and 2,000.
* 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 Creator/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 celebrated the 45th Anniversary with ''Film/KamenRider1 the Movie'' (in place of the ''Superhero Taisen'' series), starring the [[Series/KamenRider original Kamen Rider]] and having him team up with the then-current show, ''Series/KamenRiderGhost''.
** The 2018-19 season, ''Series/KamenRiderZiO'', happens to be the 20th Heisei season, the 10th season since ''Decade'', and by a remarkable coincidence, the last season to take place during the reign of Japanese Emperor Akihito (Heisei). As a result, this season is both this and the GrandFinale of the Heisei era.
* 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}}'' episode "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/TheBradyBunch'' 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 ''Film/StarTrek2009'' 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.
* ''Franchise/UltraSeries''
** 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 (1993), Tsuburaya created the film ''Ultraman Zearth'', another AffectionateParody of the franchise.
** For ''Series/{{Ultraman}}'''s 30th anniversary in 1996, Tsuburaya made ''Series/UltramanTiga'', marking the first full-fledged series after 15 years of short-lived foreign productions, movies, and the like. More specifically, the 49th episode "The Ultra Star" was the series' celebratory episode, featuring the protagonist travelling go to 1965 and meeting franchise creator Creator/EijiTsuburaya, as well as Tiga teaming up with the original Ultraman!
** The franchise's 35th anniversary was the 2001 ''Series/UltramanCosmos'' movie ''First Contact'' where Ultraman Cosmos battles against the original Ultraman's most famous enemy, [[InsectoidAliens Alien Baltan]]. It also serves as the prequel to the ''Ultraman Cosmos'' series.
** In 2006, ''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.
** ''Series/UltraSevenX'', an adult-oriented CyberPunk SpyFiction, was released in late 2007 to commemorate the 40th anniversary of ''Series/UltraSeven''.
** 2015 was the 10th anniversary of the [[ScrewedByTheNetwork unfortunately abrupt finale]] of the notoriously DarkerAndEdgier reboot attempt ''Series/UltramanNexus'', which saw a reunion of the cast and crew, a miniseries on the show's making, and an episode of then-incumbent series ''Series/UltramanX'' where Ultraman Nexus returned as a guest star and themes from the series were explored. The same year was also the 10th anniversary of ''Series/UltramanMax'' also celebrated by ''Ultraman X'' in its 8th episode where Max makes a guest appearance.
** 2016 marked the 50th anniversary of ''Series/{{Ultraman}}'' as well as the 20th anniversary of ''Series/UltramanTiga''. So, Tsuburaya celebrated with an ''Series/UltramanX'' movie featuring guest appearances from Ultraman and Tiga (as well as their respective iconic foes Antlar and Fire Golza) and the series ''Series/UltramanOrb'', where the title hero is able to call upon the powers of previous Ultramen, most prominently Ultraman and Tiga. ''Ultraman Orb'' would go on to celebrate ''Series/{{Ultraseven}}'' and ''Series/UltramanDyna'''s respective 50th and 20th anniversaries in 2017 by having the respective heroes prominently (and respectively) guest star in a movie and a spinoff series.
* ''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 [[https://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 [[ComicStrip/{{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/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 ''Series/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 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, Creator/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.
** Parodied again in a season 41 episode hosted by Creator/MelissaMcCarthy. She boasted in her monologue that the episode marked her fifth time hosting ''SNL'', and led cast members in a celebratory musical number. [[spoiler:Then Kenan Thompson (dressed as the number 5) interrupted by informing [=McCarthy=] that her appearance in the 40th Anniversary Special doesn't count as a complete hosting gig, bringing her tally down to 4 1/16.]] When she hosted again in season 42, [[spoiler:Steve Martin interrupted her closing comments, to congratulate her for ''officially'' hosting five times, as the cast presented her with a special jacket.]]
* ''Series/RetroGameMaster''
** As lampshaded in the ''VideoGame/ParappaTheRapper'' episode, a [=PS1=] game is played for special occasions.
** November 4, 2013 marked the tenth anniversary of the show, at which point it was officially classified a LongRunner. The show celebrated this milestone 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 celebrants often include Creator/BillMurray, who was Dave's guest on the first episodes of both the ''Late Show'' and ''Late Night''.
** Barely a year into ''The Late Show'' Dave announced they had broadcast 1,000 episodes 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 [[https://www.youtube.com/watch?v=pIBnwQWdn4M a special credits montage]].
* On ''Series/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.
* The 100th episode of ''Series/PersonOfInterest'' ended with the deaths of Root and Elias (for real this time), and Finch vowing to destroy Samaritan once and for all, consequences be damned.
* ''Series/{{Arrow}}'': The 100th episode "Invasion!", is part of a four-part crossover with ''Series/TheFlash2014'', ''Series/LegendsOfTomorrow'', and ''Series/{{Supergirl 2015}}''. It also features call backs to nearly the entire series, the return of several characters, and a battle royale with Oliver and his friends vs illusory versions of several past villains.
* ''Series/MysteryScienceTheater3000'' had its 200th episode land in the Netflix's third episode ''The Time Travelers''. It was mentioned at the tail end of the episode by Kinga Forrester, who lampshades this that celebrating "false anniversaries" is important.
* The first half of ''Series/FullerHouse''[='=]s third season arrives on September 22, 2017 - exactly 30 years to the day its parent series ''Series/FullHouse'' premiered in 1987.
* ''Series/TheMickeyMouseClub'': A special episode of the 1990's revival featured a reunion of Mouseketeers from the original 1950's show, commemorating both the revival's 100th episode and the original show's 35th anniversary.
* The 100th episode of ''Series/LastWeekTonightWithJohnOliver'' had [[https://images.genius.com/18d3d1fcb8a58b5162648c3870cc95b0.640x360x1.png a title card remarking on this]], and [[https://www.youtube.com/watch?v=fpbOEoRrHyU a main segment]] on net neutrality that served as a sequel to one in the inaugural season 3 years prior.
* ''Series/BrooklynNineNine'' treated the 99th episode like it was its 100th, and as such featured a more ambitious plot that involved Captain Holt being interviewed for a commissioner promotion that he'd wanted for the entire series, and the presinct going on a road-trip across the US in an attempt to get to the interview in time. It also featured a major reveal - namely, that Rosa Diaz [[spoiler: is a bisexual.]]
* The [=100th=] episode of ''Series/AgentsOfSHIELD'' is the Season 5 episode "The Real Deal", wherein the SpecialEditionTitle contains every special logo used over the run of the series, a RealityBleed conjures illusions of various past antagonists, and most importantly, [[OfficialCouple FitzSimmons]] finally get married.
* ''Series/{{Hells Kitchen}}'' marked its 100th dinner service with a special black tie event, and the four previous winners were invited to sit at the chef's tables.
----
** 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 (unless you count him getting a spiffy new TARDIS console).
** 1985 saw the 100th [[Literature/DoctorWhoNovelisations Target novelisation]], Creator/RobertHolmes' adaptation of his TV story "[[Recap/DoctorWhoS22E4TheTwoDoctors The Two Doctors]]", with an introduction by Creator/JohnNathanTurner, 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".
*** The Literature/DoctorWhoNewAdventures marked the anniversary with a story arc running from October 1993 to February 1994 and featuring a number of old villains and monsters from the TV series appearing in the novels for the first time.
*** ''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 ''[[Recap/DoctorWhoNewAdventuresHappyEndings Happy Endings]]'' (1996) by Creator/PaulCornell, in which a new cover design 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 ''every NA writer except one''[[note]]Jim Mortimore[[/note]] contributes a paragraph to the reception.
** ''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 [[BattleInTheCentreOfTheMind 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.
*** [[ComicBook/DoctorWhoIDW IDW comics]]: "ComicBook/DoctorWhoTheForgotten", 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. Also, nearly every episode of the season that preceded "The Day of the Doctor" featured a plot or characters related to the long history of the series, as did the episode that immediately followed a few weeks later, the 2013 Christmas special, "The Time of the Doctor", which resolved a 37-year-old plot thread, an 8-year-old plot thread, a 3-year-old plot thread, and introduced a new Doctor, to boot.
*** 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: [[Literature/DoctorWho11Doctors11Stories 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.
*** ''Doctor Who Magazine'' 467, which featured "John Smith and the Common Men", also came with a special mini-magazine showing what DWM might have looked like in 1964, marking the show's first anniversary, and collectible art cards of the First through Twelfth Doctors (leaving out War).
*** 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, [[Creator/IDWPublishing 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.
** ''Doctor Who Magazine'' marked its 500th issue in 2016 with the comic "The Stockbridge Showdown", pitting the Twelfth Doctor and [[ReunionShow most of the living DWM-original companions]] against one of the strip's major villains in a finale to a long-AbortedArc, a bonus magazine covering DWM's history, a double-sided poster, the first of nine collectible art cards, and a sheet of stickers (calling back to DWM's first issue, back when it was ''Doctor Who Weekly'', which came with transfers).
* 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 UsefulNotes/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.
*** The show celebrated its 25th, 30th, and 35th Anniversaries with a primetime special. The first (#0001S) used the half-hour format, with the other half filled with clips; the second (#0001LV) was taped in Las Vegas, using the regular format; the third (#023SP) also celebrated Bob Barker's 50 years in television, with a similar format as the 25th-Anniversary Special and a cameo by Creator/AdamSandler.
*** During the first week of the 40th season, there was a 40th Anniversary Special, in which the audience consisted ''entirely'' of past contestants who were invited back to play again. One player, Paul Levine, who was the first player to play "Bonus Game" on the pilot episode, played that same game again, winning a restored 1972 Chevrolet Camaro, the same car he'd originally won in the pilot.
** ''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.
*** For the Trebek version's 10th season, there was a Tenth Anniversary Tournament featuring players from each of the show's first 9 seasons, giving the season 9 slot to Tom Nosek, the then-newest Tournament of Champions winner). The tournament was won by season 6's Frank Spangenberg ([[SugarWiki/MomentOfAwesome after a major turnaround in the final games]]).
** ''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 [[AbsenteeActor 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 Creator/LeVarBurton, who also directed the episode.
** ''Series/StarTrekTheNextGeneration'':
*** The series' 80th episode produced, "Legacy", surpassed TOS' total of 79[[note]]though that is based on counting TNG's PilotMovie as two episodes, which the production numbers for the series did; in addition, the TOS two-parter "The Menagerie" is considered a single episode for production purposes, since it incorporated nearly the entirety of the first, unaired pilot, "The Cage", and the new footage was produced under the timeframe and budget of a single episode[[/note]] had the ''Enterprise'' be forced to bypass a scheduled stop at Camus II, the planet where "Turnabout Intruder", the TOS finale, took place.
*** The series' 100th episode, ''Redemption'', was the fourth-season {{Cliffhanger}}. It was a key episode in Worf's arc, marked the beginning of a Klingon civil war, and ended on TheReveal of Romulan Commander Sela, [[WhamShot a dead ringer for the late Tasha Yar]][[note]]confirmed in the next episode as the daughter of the alternate Tasha from "Yesterday's Enterprise"; [[IdenticalGrandson both characters played by Denise Crosby]][[/note]].
*** The two-part "Unification", airing in November 1991 and featuring Creator/LeonardNimoy as Spock, was created in conjunction with ''Film/StarTrekVITheUndiscoveredCountry'' (and Spock even references the events of the film) as part of ''Star Trek'''s 25th anniversary. The episodes were also dedicated to Creator/GeneRoddenberry, who passed away during their production.
* ''Series/BuffyTheVampireSlayer'':
** The 100th episode coincided 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. Further, 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'':
** 10-year anniversary: "Forever Red" in ''Series/PowerRangersWildForce''. 10 years of Red Rangers returned for a fight against TheRemnant of [[Series/PowerRangersZeo the Machine Empire.]]
** 500th episode - "Legacy of Power" in ''Series/PowerRangersDinoThunder'', 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.
** 15-year anniversary: "Once A Ranger" in ''Series/PowerRangersOperationOverdrive'', a two-parter which had some of the more popular (non-Red) Rangers return for another fight.
** 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.)
** 25-season anniversary: "Dimensions in Danger" in ''Series/PowerRangersNinjaSteel'', another big ReunionShow involving TheMultiverse and Rangers from across the entire franchise.
* On the other side of the Pacific, you have ''Franchise/SuperSentai'':
** An odd case: ''Series/KousokuSentaiTurboranger'' was launched as the then-eleventh show (tenth anniversary) of ''Super Sentai''. 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.
** 25th series: a 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]]. The movie ends with ''every'' previous Red Ranger showing up, albeit in costume only.
** 30th series: ''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.]]
** 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. This is acknowledged in the movie's ending when the heroes celebrate a birthday party, and calling it "a Super Sentai birthday". Afterwards, theatrical releases for reunion movies became the norm.
** 35th series: ''Series/KaizokuSentaiGokaiger'', the Sentai equivalent of ''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 the two Red Rangers of the past ninja series, ''Series/NinjaSentaiKakuranger'' and ''Series/NinpuuSentaiHurricaneger'', guest star in Episode 7; plus an additional cameo by Akaranger from ''Goranger''. 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.
** While ''Ninninger'' celebrated the 40th ''year'' of the franchise, ''Series/DoubutsuSentaiZyuohger'' was the 40th ''installment''; and the franchise also hit 2,000 total episodes that season. The show celebrated both by bringing back the Gokaigers for episodes 1,999 and 2,000.
* 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 Creator/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 celebrated the 45th Anniversary with ''Film/KamenRider1 the Movie'' (in place of the ''Superhero Taisen'' series), starring the [[Series/KamenRider original Kamen Rider]] and having him team up with the then-current show, ''Series/KamenRiderGhost''.
** The 2018-19 season, ''Series/KamenRiderZiO'', happens to be the 20th Heisei season, the 10th season since ''Decade'', and by a remarkable coincidence, the last season to take place during the reign of Japanese Emperor Akihito (Heisei). As a result, this season is both this and the GrandFinale of the Heisei era.
* 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}}'' episode "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/TheBradyBunch'' 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 ''Film/StarTrek2009'' 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.
* ''Franchise/UltraSeries''
** 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 (1993), Tsuburaya created the film ''Ultraman Zearth'', another AffectionateParody of the franchise.
** For ''Series/{{Ultraman}}'''s 30th anniversary in 1996, Tsuburaya made ''Series/UltramanTiga'', marking the first full-fledged series after 15 years of short-lived foreign productions, movies, and the like. More specifically, the 49th episode "The Ultra Star" was the series' celebratory episode, featuring the protagonist travelling go to 1965 and meeting franchise creator Creator/EijiTsuburaya, as well as Tiga teaming up with the original Ultraman!
** The franchise's 35th anniversary was the 2001 ''Series/UltramanCosmos'' movie ''First Contact'' where Ultraman Cosmos battles against the original Ultraman's most famous enemy, [[InsectoidAliens Alien Baltan]]. It also serves as the prequel to the ''Ultraman Cosmos'' series.
** In 2006, ''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.
** ''Series/UltraSevenX'', an adult-oriented CyberPunk SpyFiction, was released in late 2007 to commemorate the 40th anniversary of ''Series/UltraSeven''.
** 2015 was the 10th anniversary of the [[ScrewedByTheNetwork unfortunately abrupt finale]] of the notoriously DarkerAndEdgier reboot attempt ''Series/UltramanNexus'', which saw a reunion of the cast and crew, a miniseries on the show's making, and an episode of then-incumbent series ''Series/UltramanX'' where Ultraman Nexus returned as a guest star and themes from the series were explored. The same year was also the 10th anniversary of ''Series/UltramanMax'' also celebrated by ''Ultraman X'' in its 8th episode where Max makes a guest appearance.
** 2016 marked the 50th anniversary of ''Series/{{Ultraman}}'' as well as the 20th anniversary of ''Series/UltramanTiga''. So, Tsuburaya celebrated with an ''Series/UltramanX'' movie featuring guest appearances from Ultraman and Tiga (as well as their respective iconic foes Antlar and Fire Golza) and the series ''Series/UltramanOrb'', where the title hero is able to call upon the powers of previous Ultramen, most prominently Ultraman and Tiga. ''Ultraman Orb'' would go on to celebrate ''Series/{{Ultraseven}}'' and ''Series/UltramanDyna'''s respective 50th and 20th anniversaries in 2017 by having the respective heroes prominently (and respectively) guest star in a movie and a spinoff series.
* ''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 [[https://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 [[ComicStrip/{{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/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 ''Series/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 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, Creator/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.
** Parodied again in a season 41 episode hosted by Creator/MelissaMcCarthy. She boasted in her monologue that the episode marked her fifth time hosting ''SNL'', and led cast members in a celebratory musical number. [[spoiler:Then Kenan Thompson (dressed as the number 5) interrupted by informing [=McCarthy=] that her appearance in the 40th Anniversary Special doesn't count as a complete hosting gig, bringing her tally down to 4 1/16.]] When she hosted again in season 42, [[spoiler:Steve Martin interrupted her closing comments, to congratulate her for ''officially'' hosting five times, as the cast presented her with a special jacket.]]
* ''Series/RetroGameMaster''
** As lampshaded in the ''VideoGame/ParappaTheRapper'' episode, a [=PS1=] game is played for special occasions.
** November 4, 2013 marked the tenth anniversary of the show, at which point it was officially classified a LongRunner. The show celebrated this milestone 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 celebrants often include Creator/BillMurray, who was Dave's guest on the first episodes of both the ''Late Show'' and ''Late Night''.
** Barely a year into ''The Late Show'' Dave announced they had broadcast 1,000 episodes 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 [[https://www.youtube.com/watch?v=pIBnwQWdn4M a special credits montage]].
* On ''Series/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.
* The 100th episode of ''Series/PersonOfInterest'' ended with the deaths of Root and Elias (for real this time), and Finch vowing to destroy Samaritan once and for all, consequences be damned.
* ''Series/{{Arrow}}'': The 100th episode "Invasion!", is part of a four-part crossover with ''Series/TheFlash2014'', ''Series/LegendsOfTomorrow'', and ''Series/{{Supergirl 2015}}''. It also features call backs to nearly the entire series, the return of several characters, and a battle royale with Oliver and his friends vs illusory versions of several past villains.
* ''Series/MysteryScienceTheater3000'' had its 200th episode land in the Netflix's third episode ''The Time Travelers''. It was mentioned at the tail end of the episode by Kinga Forrester, who lampshades this that celebrating "false anniversaries" is important.
* The first half of ''Series/FullerHouse''[='=]s third season arrives on September 22, 2017 - exactly 30 years to the day its parent series ''Series/FullHouse'' premiered in 1987.
* ''Series/TheMickeyMouseClub'': A special episode of the 1990's revival featured a reunion of Mouseketeers from the original 1950's show, commemorating both the revival's 100th episode and the original show's 35th anniversary.
* The 100th episode of ''Series/LastWeekTonightWithJohnOliver'' had [[https://images.genius.com/18d3d1fcb8a58b5162648c3870cc95b0.640x360x1.png a title card remarking on this]], and [[https://www.youtube.com/watch?v=fpbOEoRrHyU a main segment]] on net neutrality that served as a sequel to one in the inaugural season 3 years prior.
* ''Series/BrooklynNineNine'' treated the 99th episode like it was its 100th, and as such featured a more ambitious plot that involved Captain Holt being interviewed for a commissioner promotion that he'd wanted for the entire series, and the presinct going on a road-trip across the US in an attempt to get to the interview in time. It also featured a major reveal - namely, that Rosa Diaz [[spoiler: is a bisexual.]]
* The [=100th=] episode of ''Series/AgentsOfSHIELD'' is the Season 5 episode "The Real Deal", wherein the SpecialEditionTitle contains every special logo used over the run of the series, a RealityBleed conjures illusions of various past antagonists, and most importantly, [[OfficialCouple FitzSimmons]] finally get married.
* ''Series/{{Hells Kitchen}}'' marked its 100th dinner service with a special black tie event, and the four previous winners were invited to sit at the chef's tables.
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