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Milestone Celebration / Western Animation

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  • The Simpsons:
    • Lampshaded in their 100th episode, Season 5's "Sweet Seymour Skinner's Baadasssss Song" — all they did was have Bart write the lines "I will not celebrate meaningless milestones." Season 6's "Lisa's Rival" was the 100th produced episode, but the producers always planned for "Sweet Seymour Skinner's Baadasssss Song" to be the celebration.
    • Episode 167, season 8's "The Itchy & Scratchy & Poochie Show", was the episode that tied the show with The Flintstones as the longest-running animated prime time show, and featured a lot of Lampshade Hanging on various Animation Tropes. Some versions of the episode use the couch gag where the family find the Flintstones already sitting there.
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    • Season 9's "Trash of the Titans" was the 200th episode of the series. The episode starts with where the Couch Gag would be, except Homer, Marge, Lisa and Maggie end up running into Bart's classroom, where they find Bart writing, "I will not mess with the opening credits."
    • The series had a special 300th episode...sorta. Season 14's "Barting Over" was actually the 302nd episode, but Fox insisted on a special event episode to coincide with the Daytona 500. Nothing too special about the episode itself, other than guest shots by Tony Hawk and Blink 182 and an unusual Chalkboard Gag where Bart writes "I will not" repeatedly until he stops, pulls an axe out of nowhere, and chops up the chalkboard until the school bell rings, but there is a gag where Lisa mentions that this is the 300th time that Homer has done something crazy with Marge saying she counted 302. For the record, the 300th episode was "Strong Arms of the Ma".
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    • The 400th episode, the season 18 finale "You Kent Always Say What You Want", opens with The Tracey Ullman Show short "Family Portrait", which was also to celebrate the 20th anniversary of The Simpsons debut on The Tracey Ullman Show.
    • The 20th anniversary was marked with the documentary The Simpsons 20th Anniversary Special: In 3-D! On Ice!, directed by longtime fan Morgan Spurlock (Super Size Me) and broascast on January 10, 2010, following the 451st episode (which Fox promoted as the 450th for whatever reason; had they not promoted it as such, the documentary would have aired on January 14, the original broadcasting date of "Bart the Genius").
    • Its 500th episode, season 23's "At Long Last Leave", had a couch gag that showed all the previous 499 couch gags, all continuing to pan skyward as they play out until it stops with the multiple incarnations of the family sitting at their couch, forming a mosaic "500". In addition, the chalkboard gag is Milhouse writing "Bart's earned a day off" and the opening logo includes a caption declaring "The most meaningless milestone of all!", referencing the chalkboard gag from the 100th episode.
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    • Their 550th episode, season 25's "Brick Like Me" aka "The Simpsons Lego Spectacular", has Springfield reimagined as LEGOs. Notably, the LEGO aspect was promoted and not the episode count. And a contest was held for fans to introduce a new character to the show. The winning entry was Ricardo Bomba, a South American ladies' man who works as a safety inspector at the nuclear power plant. The episode where he made his debut killed him off before anything could be established about him. However, executive producer Al Jean said it's possible Ricardo might appear again.
    • The 600th episode, season 28's "Treehouse of Horror XXVII", was the episode that tied with Gunsmoke as the longest running American scripted primetime series (recognized by one of the joke credits, which reads "We're coming for you, Gunsmoke"), and acknowledges this at the end of the opening sequence, where Frank Grimes warns that you'd be forced to watch a marathon of all the episodes in Hell.note 
    • The 30th anniversary of the family's first appearance (on The Tracey Ullman Show in 1987) was celebrated in the 616th episode "Looking for Mr. Goodbart". A clip from the first Tracey Ullman short "Good Night" was played before the intro sequence (a parody of The Big Bang Theory's).
    • It's been confirmed that the show's 666th episode, fittingly enough, is going to be a "Treehouse of Horror" episode.
    • "Springfield of Dreams: The Legend of Homer Simpson" was a Mockumentary created to celebrate the 25th anniversary of the episode "Homer at the Bat".
    • "Bart's Not Dead", the premiere of the 30th season, had the title tweaked to celebrate the anniversary. Instead of the usual opening showing the Simpsons coming home, there's a montage of memorable moments from previous episodes, each from a different seasonnote . During the last clip, the camera pans out to reveal an alien living room 30 light years away from Earth, transitioning to the Couch Gag featuring an alien family resembling the Simpsons, with the Homer analogue commenting on how different Homer's voice used to be.
    • In-Universe references/parodies:
      • The gag for the 499th episode was a surprise 500th episode party. When Lisa points out the error, Moe replies, "Well, guess what? Fox isn't doing this again."
      • "Fears of a Clown" featured a similar couch gag where the Simpsons secure a spot in the Museum of Television for reaching 636 episodes (surpassing Gunsmoke for the highest number of scripted episodes for a primetime TV series), when it was actually the 632nd episode to air, as once again pointed out by Lisa.
      • They also parodied this trope with "The Simpsons 138th Episode Spectacular", the third Clip Show episode.
      • Spoofed in-story in "I Love Lisa" with The Krusty the Klown 29th Anniversary Show.
  • South Park's 97th episode "Canceled" was clearly intended to be the 100th (with the Leaning on the Fourth Wall moment and all), but it was instead aired as the 97th so as to be the Season 7 premiere, taking advantage of its Mind Screw opening that mirrored the Pilot Episode. The actual 100th episode, "I'm A Little Bit Country", had a tacked-on "100 episodes" acknowledgement at the end.
    • The 200th episode is the first of a two-parter and features a story involving every celebrity the town has ever pissed off; the second part is also a Wham Episode for Cartman: His true father is also Scott Tennorman's.
  • 1990 was the 50th aniversary of Bugs Bunny, celebrated with a half-hour special entitled Happy Birthday, Bugs: 50 Looney Years; the first cinematic Looney Tunes short in decades ("Box Office Bunny"), and a book (Happy Birthday, Bugs) and video game (The Bugs Bunny Birthday Blowout) based around Bugs's birthday party. Spoofed in the following year's short "Blooper Bunny", which celebrates Bugs Bunny's 51 1/2 anniversary with a brief dancing number. Most of the cartoon is behind-the-scenes footage and Hilarious Outtakes of said dance number.
  • Spoofed in Animaniacs, with the Warners' 65th Anniversary Special (referring to their backstory of being created in The '30s). In actuality, this was the 65th episode and first season finale. In a more literal sense, the direct-to-video movie Wakko's Wish is essentially the show's 100th episode and series finale.
  • Family Guy:
    • The 100th episode (excluding the splitting of the DVD movie into seperate episodes for broadcasting) was Stewie Kills Lois, kicking off a two-parter in which Stewie finally realizes his ambition to kill his mother and conquer the world...or so it seems.
    • The 150th episode was an experimental story called Brian and Stewie in which only the two title characters appear, the entire episode is confined to a single scene, and there are no cutaway gags or even music.
    • The 200th episode, "Yug Ylimaf", involves Stewie and Brian accidentally reversing time (indicated by the title) and revisiting moments from older episodes.
  • SpongeBob SquarePants' 10th anniversary special is an hour long and features live action appearances by Will Ferrell, Craig Ferguson, Tina Fey, Rosario Dawson, LeBron James, P!nk, and Robin Williams. And Ricky Gervais was the narrator. The plot for the episode itself is that the Krusty Krab is celebrating its eleventyseventh anniversary. This prompts the characters to reminisce, only instead of a standard Clip Show, the flashbacks are all new.
    • The 20th anniversary had a campaign called Best Year Ever, which consisted of the following celebrations:
      • The first toyline in years for the show was announced in February at the New York Toy Fair.
      • Screenvision, who previously partened with Nickelodeon for Nick Jr. At The Movies and a one-day showing of Hey Arnold! The Jungle Movie, made an exclusive "No Talking or Phones" Warning to be played at their theaters.
      • A spin-off featuring a younger SpongeBob called Kamp Koral got announced.
      • Entenmann's Little Bites collaborated with the show for a contest where the winner would stay in the SpongeBob house replica at Nickelodeon's hotel in Punta Cana.
      • SpongeBob's Birthday Blow-Out, a special with live-action humans, aired on the week of the 20th anniversary.
      • San Diego Comic-Con recreated Bikini Bottom at their Nickelodeon booth.
      • In Peru, Dunkin Donuts made exclusive donuts in the likeness of SpongeBob and Patrick.
  • The Fairly OddParents! 100th episode was the final part of the Big Damn Movie "Wishology". Plus, for it's 10th anniversary celebration, a live-action movie, "A Fairly Odd Movie: Grow Up, Timmy Turner!", was released, in which we see the characters 13 years in the future.
  • While the series itself never reached 100 episodes, the original The Powerpuff Girls had a 10th anniversary special years after the show ended, which celebrated everything fans loved about the show compressed into 25 minutes. That would be wordplay, self-referential humor, homages & parodies, wit, and the occasional song.
  • Turtles Forever, a celebration of 25 years of the Teenage Mutant Ninja Turtles that also serves as both a Grand Finale for the 2003 series and a fitting send-off to the Mirage era of the franchise as a whole, what with it being sold to Nickelodeon shortly before its airing. Also, the 100th episode of the 2003 series is a special episode depicting the story of Master Splinter's owner Master Hamato Yoshi.
  • Spoofed on KaBlam!.
    • The show is all set for its 100th episode, complete with a stadium, dancers, red carpet, fancy dress, etc. Then, maybe thirty seconds after the show starts, a stagehand tells Henry and June that it's only the 24th episode. Unfortunately, it was the 17th episode aired on Nickelodeon.
    • After eleven years of not having regular reruns (for the show itself- Life With Loopy, Prometheus And Bob, and a few other shorts were reran on their own on Nicktoons until early 2007), The Splat has confirmed that the show will debut on the block for the weekend of October 8 and 9, 2016- which happens to be the weekend right before the show's twentieth anniversary on October 11th.
  • Futurama's 100th episode is another spin on the RMS Titanic tragedy (this was done before in the show's 10th episode, which featured a spaceship version of the cruiser as its main setting, but this episode uses a "Land Titanic" for its backstory), but nonetheless shook up the status quo a bit by having Leela's heritage as a mutant accidentally outed, giving the mutants equal rights, and even pulling a Like You Would Really Do It by making it look as if Fry mutated himself. And of course, the Lead In for this episode is the Planet Express crew making their 100th delivery, and the party celebrating it serves as a minor B-plot.
  • American Dad!:
    • The series begins its 100th episode with Roger dressed as the Grim Reaper, telling viewers that to celebrate the milestone, they're going to kill off 100 characters. There's even an on-screen counter to keep track of the deaths. The show keeps its promise, though 96 of those deaths belong to background characters who are killed all at once in a bus crash.
    • The 200th episode featured an After the End scenario with cameos by almost every character in the series. The number was also significant in that it referred to the 200 clones Roger made of himself in the Large Hadron Collider which triggered the apocalypse in the first place.
  • Aqua Teen Hunger Force's 100th episode paid homage to Scooby-Doo, and also features a subplot of Master Shake visiting the show's executives (in the form of Dana Snyder, no less), trying to bring the show into syndication. However, since the show is only a Quarter Hour Short, it only has fifty half-hours of material.
  • The 100th episode of Regular Show, "A Bunch of Full-Grown Geese", is full of call backs, starting with the return of the baby ducks from "A Bunch of Baby Ducks" (which is also alluded to in the episode's title). Later, when Mordecai, Rigby and the ducks merge into a Humongous Mecha, various items from previous episodes (the magic keyboard from "The Power", the trucker hat from "Eggcelent", etc.) make an appearance.
  • The 100th episode of Total Drama, "Zeke and Ye Shall Find", has all the current competitors going up against Ezekiel — the first contestant ever eliminated from the show.
  • For The Legend of Korra, there's the episode "Venom Of The Red Lotus". Not only is it the 39th episode in this show, but it's also the 100th episode in the entire Avatar: The Last Airbender franchise. The episode ends with Jinora becoming the first master Airbender in the newly-remade Air Nomads, having shaved her head and looking just like her grandpa Aang.
  • My Little Pony: Friendship Is Magic:
  • Cartoon Network:
    • Cartoon Network's 20th anniversary celebration in 2012. They temporarily re-aired episodes of many of their classics, brought in a set of bumpers featuring numerous Crossovers, created a medley of CN theme songs (can be seen here), and finally a rather psychedelic music video and poster, featuring over a hundred characters from nearly every cartoon ever shown on CN.
    • For their 25th, they put out a short bumper of their original characters forming a 25, and later a music video of their older and then-current characters alike having a dance-off.
  • Ben 10:
    • The 100th episode of the franchise is fairly episodic in nature with not one Callback in the entire thing. In fact, it only stands out because it's one of the few episodes that has a Downer Ending.
    • The 199th and 200th episodes (in production order) of the franchise deal with a time traveling Villain Team-Up that has a group of evil Bens ready to defeat and conquer every universe. Ben is joined by other alternate versions of himself (a few of them established in previous installments) and has a reveal that Ben got the Omnitrix because a version of him that never obtained it, along with Paradox, manipulated the events of the first episode.
  • Subverted in The Book of Pooh when the storybook the series is set in reaches its 100th page. Pooh and the rest want to celebrate that, but by the time they were ready, the book has advanced to page 110.
  • The 2012/2013 Peter Rabbit series coproduced with Nickelodeon and Cbeebies debuted on the 110th/111th anniversary of the original The Tale of Peter Rabbit in 1902.
  • Steven Universe celebrated 100 episodes with the first true double-length episode "Bismuth"note . It was also a Wham Episode, introducing a long-lost Crystal Gem and revealing that Rose bubbled Bismuth and claimed she was dead to prevent her from using a weapon that could instantly kill a gem.
  • Kaeloo: Episodes 99 and 100 were a two-parter.
  • 2017 saw the 25th anniversary of Harley Quinn's first appearance in Batman: The Animated Series, which DC marked with an anniversary logo, original animated movie Batman and Harley Quinn, a 25th anniversary special oneshot comic, and the "Surprise, Surprise" two-parter in issues #25-26 of her DC Rebirth ongoing.


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