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8* ''WesternAnimation/AdventureTime'':
9** Thanks to its sudden cancellation during halfway of Season 9, the series had to hastily tie up four plotlines (Finn and Fern, Gumbald, Simon and Betty and GOLB) at once with "Come Along With Me". Had the series not been cancelled, the rest of the episodes would've focused more on Gumbald and his plans, as well as Minerva, Susan Strong and Sweet P. The Simon and Betty/GOLB plotlines were also originally planned to be part of the real finale of the show before being reworked into what we got today.
10** Finn's love life has been one of the most notorious plot threads among fans since the beginning of the series, with the amount of teasing, confirming ships and sinking them seasons or episodes later, which caused a lot of anger and frustration with shippers. It happened with Princess Bubblegum, and it happened again with Flame Princess. And once the show finally did something between him and Huntress Wizard, the finale ''and'' the ''[[WesternAnimation/AdventureTimeDistantLands Distant Lands]]'' miniseries completely ignored their relationship. While the former suffered because of the cancellation, the latter had no reason to ignore this plot thread since the miniseries gives closure to the main characters, which ended up frustrating fans who waited years for some resolution.
11* ''WesternAnimation/AmericanDad'':
12** Steve's budding relationship with Akiko was abruptly dropped after they officially became a couple in "Spelling Bee My Baby", with Akiko [[ChuckCunninghamSyndrome vanishing from the series]] afterwards and [[StatusQuoIsGod leaving Steve single once again]].
13** Season 9 began a long arc of Jeff getting sent into space by Roger when a ship came to get him. We finally got to see some of Roger's people and learned that he had been in a relationship with the ship's leader. While Jeff eventually made it back to Earth, Roger's species, their leader, and his home planet haven't been seen or mentioned since.
14* ''WesternAnimation/{{Archer}}'': Up to Season 4, who was Archer's father was a recurring subplot, but after the death of one of the possible candidates and the introduction of another one, the show completely dropped this plot and never brought it up again. According to interviews, the series creator indicated he did this because he felt the audience had no interest in that particular plot.
15* ''WesternAnimation/AsToldByGinger'' has a particularly jarring one in the episode "Wicked Game": a deeply involved plot about a [[spoiler: plan involving Ginger's best friends to break her and Darren up]]. In a series that normally follows things through, the sudden lack of consequence to this episode is especially jarring.
16* ''WesternAnimation/AvatarTheLastAirbender'':
17** The season one finale features [[TheHero Aang]] traveling to the spirit world meeting the potent character Koh the Face Stealer, who ominously says "We'll meet again," as Aang leaves. They never met again in the series, not even in the second season of ''WesternAnimation/TheLegendOfKorra'' which [[WhatHappenedToTheMouse dealt with nothing but spirits]]. That said, this was touched upon in ''VideoGame/EscapeFromTheSpiritWorld'', a Flash game that takes place between seasons 2 and 3, where they do meet again, and Koh is more than a little eager to pay Aang back for escaping the last time they met. The comic book ''ComicBook/AvatarTheLastAirbenderTheSearch'' does feature Koh more prominently, though he is never actually seen in the story.
18** The Rough Rhinos were introduced early in Book 2 as recurring antagonists. When Katara looks into Jet's memories, it is revealed that they were responsible for the death of Jet's parents, which is treated as a WhamShot. Their appearances set them up as major threats for later down the road, but they're never seen again for the rest of the series, only showing up again in the graphic novels.
19* ''WesternAnimation/Ben10AlienForce'': At the end of the second season, it's implied that Ben's Omnitrix resets, giving him 10 new aliens, stating he "doesn't recognize any of these guys" and switches into Lodestar, an alien never seen before. However, in the third season, he has the same exact aliens from the first two seasons. He wouldn't switch into Lodestar until episode 5, with him having no memory of him.
20* ''WesternAnimation/Ben10UltimateAlien'': Three arcs fell victim to this; the lingering threat of King Viktor, the redemption journey of Charmcaster (whose true name is [[spoiler: Hope]]), and the possession of Elena Validus by the Hive nanochips. This was because then-series producer [[DiedDuringProduction Dwanye McDuffie passing away]] during production. The people placed in charge of [[WesternAnimation/Ben10Omniverse the following series]] outright stated they had no interest in continuing them. While that first plot got some satisfying closure through Dr. Viktor becoming himself again ([[AuthorsSavingThrow with Zs'Skayr being shown removing Xarion's soul and allowing Viktor to regain control]]), the others didn't. Elena cameoed as herself toward the end of the series with no explanation as to how she was freed of the nano chips' influence, while Charmcaster never went by her true name again and saw no escape from the HeelFaceRevolvingDoor (as the answer for what side she'd finally land on was to happen in a proposed SpinOff starring Ben's cousin Gwen, who is Charmcaster's main rival).
21* The format change in ''WesternAnimation/BigHero6TheSeries'' from the first two seasons' 22-minute action-packed episodes to more comedic 11-min. episodes meant that Karmi's story arc after her departure from the show was nixed. She returns in one episode to confirm she and Hiro have feelings for each other, but this is never explored any further. Hardlight, a formidable foe who was also hinted to have a double life, also returns, but he is easily defeated and arrested in that episode. Even Sirque, who got away and used dangerous portal technology, was arrested off-screen between seasons.
22* Birdboy's debut episode in ''WesternAnimation/Birdman1967'' ended with Birdman promising to help him [[DisappearedDad find his father]], and the search was occasionally brought up in Birdboy's later appearances. However, nothing ever came of it.
23* In the Season 2 finale of ''WesternAnimation/CodeLyoko'', the diary of Franz Hopper mentions that Lyoko and XANA were originally created to stop a certain "Project Carthage", a military program designed to "disrupt enemy communications". This led to the expectation that the next season would deal with the Project somewhat, while delving into Lyoko's history some more. Not so. Season 3 took off in a different direction, and other than the {{fanon}} assumption that "TheMenInBlack" seen throughout the show are from this organization, Project Carthage is never, ever mentioned again.
24* ''WesternAnimation/CodenameKidsNextDoor'': Some of the villains have [[LittleBitBeastly animal parts]]. According to the creator, an episode addressing this had been planned at some point but never came to be, so the villains all inexplicably just look like that.
25* ''WesternAnimation/DannyPhantom'' has many cases, due to co-producer Steve Marmel departing the show before its final season, with the show's writing team getting replaced as well.[[note]]Or Marmel was straight-up fired over his and creator Butch Hartman's creative differences, with the writers also getting the boot. It's unclear.[[/note]] Butch Hartman and the new writers had little interest in resolving anything outside Danny and Sam's {{UST}} for the final season, with the biggest loose ends being:
26** Anything involving [[BigBad Vlad]]'s plans with Fright Knight, the Crown of Fire, his ElaborateUndergroundBase, and his acquirement of Axion Labs.
27** The return of [[FutureMeScaresMe Danny's evil older self]], which was heavily hinted at at the end of his sole appearance, with Marmel openly stating that he did have plans for more episodes starring the villain, including the character serving as the FinalBoss of the series. This was later averted with the release of the 2023 graphic novel, ''Danny Phantom: A Glitch In Time'', which actually involves the return of Dark Danny.
28** The show's penultimate episode has Valerie discover that [[spoiler:her employer Vlad is the villainous Plasmius]]. The episode ends with her saying that she plans to do something with this information, but the final episode makes no mention of this plotline whatsoever, with Valerie herself only getting two non-speaking background cameos.
29** Both Marmel and Hartman have confirmed that if the show lasted longer, Danielle's plotline would have gone on to have her revealed to the Fentons and become HappilyAdopted by them, becoming Danny and Jazz's little sister.
30* ''WesternAnimation/DuckTales2017'': "[[Recap/Ducktales2017S2E16TheDuckKnightReturns The Duck Knight Returns!]]" ends on a {{cliffhanger}} where Jim Starling is revealed to have survived the explosion, and becomes Negaduck. However, he is never seen again after this episode, not even in the final season special "[[Recap/DuckTales2017S3E12LetsGetDangerous Let's Get Dangerous!]]". Frank Angones ''did'' state that "I didn't want to shortchange him" and that he had a big story planned for him in a later season, but the series' cancellation after season 3 ultimately prevented it.
31* ''WesternAnimation/FriskyDingo'' intentionally [[PlayingWithATrope played with this trope on at least two occasions]].
32** In one episode, [[spoiler:it was revealed that Xander had a [[LongLostRelative long lost twin brother]] named Nearl, who planned to become a villain and seek vengeance on him. Nearl was then promptly shot and killed by Ronnie, who said [[LeaningOnTheFourthWall things were already complicated enough]] without throwing some "EvilTwin bullshit" into the mix]].
33** One of the last episodes of the second season introduced Xander's illegitimate teenage daughter. She initially seemed like she was being set up to join the cast as a major character in the next season, but the episode abruptly ended with Xander paying her an outrageous sum of money to leave and never contact him again.
34* ''WesternAnimation/{{Futurama}}'':
35** The pilot episode introduced the career chip, which supposedly assigned one a permanent job and was ostensibly mandated by the law. Although Smitty and Leela both say that those who reject their career chips are labelled "job deserters" and "fired out of a cannon into the sun", nobody is ever shown facing those legal consequences. The career chip appears twice in the show and only once in the comics, and the time gap between its two appearances in the main series is quite large.
36** In "The Why of Fry", Nibbler ponders on Leela being "The Other", implying she may have a destiny of her own connected with Fry's destiny. But he doesn't elaborate on this and it never comes up again.
37** Near the end of the fourth and final of the direct to DVD films, "Into The Wild Green Yonder", The Encyclopod, a massive creature that collects specimens of endangered species around the universe, adds some human DNA to its collection. But when Fry questions why it did so considering humans are still around, it simply leaves without comment and after the series revival, this is never picked up on.
38* In an early ''WesternAnimation/{{Gargoyles}}'' episode, Demona is left thinking that Elisa is dead, which Goliath says is probably for the best for now. Nothing really came of it before she saw Elisa alive again in the season one finale, probably because the writers realized how hard it would be to keep Elisa's existence a secret from Demona while she was still living her normal life.
39* ''WesternAnimation/GeneratorRex'': The crossover with the ''Ben 10'' series hinted at the possibility Rex and Ben will meet again. Unfortunately, mostly due to Derrick J Wyatt disliking ''Generator Rex'', this was never followed up in ''Omniverse''. The [[WesternAnimation/Ben102016 Ben 10 reboot]] would have a much younger Ben meet a different Rex.
40* ''WesternAnimation/GravityFalls'': At the end of the episode "Boyz Crazy", Dipper ends up upsetting Wendy by asking her out when she's left heartbroken after dumping Robbie... but they appear to be on good terms again in the episodes that followed. It's never shown or explained how Dipper made amends with her.
41* ''WesternAnimation/KimPossible'':
42** Ron Stoppable has a romantic arc with Zita Flores, a girl who works at a movie theater who he quickly became infatuated with and who shares his love of gaming (albeit of different genres). She only appears in two season 2 episodes before reappearing in the GrandFinale over 50 episodes later, where she's been [[PairTheSpares randomly paired off]] with Ron's friend Felix. It's never mentioned at what point they stopped dating.
43** "Animal Attraction" ended with Senior Senor Jr. developing a crush on Kim Possible, one she seemed to somewhat be flattered by at the end. Outside of a brief mention in one comic, it's never brought up again.
44* In the third season of ''WesternAnimation/KingOfTheHill'', an ongoing plot thread dealt with Hank and Peggy attempting to have another baby but failing due to Hank's narrow urethra. What made this more aggravating for the Hills was that Hank's father Cotton had somehow managed to impregnate his wife Didi, with Cotton being 75 and Didi the same age as Hank. This thread followed only into the first episode of the following season and was then dropped. Though it was implied in "[[Recap/KingOfTheHillS3E5NextOfShin Next of Shin]]" that they would give up after they learned this was upsetting Bobby.
45* Two cases in ''WesternAnimation/MaxSteel''; a flashback shows that Jefferson Smith's predecessor as CEO of N-Tek (and, by extension, the man in charge of the secret espionage division) was a man named Marco Nathanson, who bore an uncanny resemblance to [[spoiler: season one BigBad John Dread.]] According to the original producer, this was actually meant as a RedHerring, though later said by others to be exactly what it looked like, but neither interpretation is followed up on. Even more blatant, the episode "Truth be Told" features [[TheCameo real-life athlete Jeremy [=McGrath=]]] discovering that the protagonist and his friends are ex-secret-agents-turned-vigilantes, and he suggests bringing in one or two friends he has on the sports circuit who could help the heroes save the day on occasion. This is the final scene of the episode, except the episode is also the SeriesFinale. Along with [[CanonDiscontinuity half the premise of the show]], this was never picked up on in the subsequent made-for-TV movies.
46* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
47** In the first two seasons of the show, the Cutie Mark Crusaders were shown to have very explicit budding talents, with Apple Bloom being particularly adept at construction, Sweetie Belle having a fantastic singing voice, and Scootaloo being a great choreographer, and it was implied that those were going to be the special talents that led them to getting their cutie marks. By the time Season 5 rolled around, those talents had been almost entirely forgotten about in favor of the three of them discovering they had a shared talent in helping others realize their cutie marks.[[note]]Sweetie Belle's eventual cutie mark does appear to reference this - while it shares its overall design with the other two Crusaders', each also contains a unique nested pair of symbols; Sweetie Belle's contains a musical note inside a star. Apple Bloom and Scootaloo's other talents, however, remain forgotten.[[/note]]
48** Season 4 had a recurring subplot about The Mane Six rebuilding The Castle of the Two Sisters, Princess Celestia and Luna's old home, implying it may be used as a new base of sorts for their future adventures down the line. But after Twilight gets [[MerchandiseDriven her own castle]] in the season finale, this plot is immediately forgotten. Aside from [[BadFuture one alternate outlier in Season 5,]] the castle does not return until Season 8, when the Young Six start to use it as their own secret base.
49** Starting with Season 4 the Tree of Harmony was introduced and increasingly built up, becoming more important to the plot and even gaining a sentient form. The last we see of this form is in ''Uprooted'' when the Young Six building a treehouse at its location revives it ([[ItMakesSenseInContext roll with it]]) and it tells them their actions have made it more powerful than before. With that it promptly vanishes from the storyline save for the Treehouse appearing as a backdrop in a couple more scenes, and plays no more role whatsoever in the story. Even the Young Six's BigDamnHeroes moment in the GrandFinale has nothing to do with the tree or its sentient spirit, and there's no mention of it in the DistantFinale either.
50* ''WesternAnimation/MyLittlePonyPonyLife'': In Season 2 there was a story arc involving a giant balloon floating in the sky shooting out bubbles containing magical objects inside them. However the balloon later disappears without any explanation of who created it and why. In the final episode its HandWaved through a song that the balloon was popped by our heroes.
51* ''WesternAnimation/TheOwlHouse'':
52** It was implied that more was supposed to be done with the Bat Queen before she just vanished from the show. Luz promising to find her original owner and possible involvement of the whistle she gave Luz never materialized.
53** Anything to do with Vee and the Basilisk project was scrapped in favor of Hunter and The Collector. Vee doesn't even get to go back to the Boiling Isles until the very end of the series.
54* ''WesternAnimation/PetAlien'': The aliens' rivalry with [[EnfanteTerrible Emperor Breet]] was the focus of the early Season 1 episode "Evil Emperor", with Breet vowing to take over the Earth and get revenge upon his initial defeat. However, when Breet returned near the end of the season in "The Day of Judgement", his intended revenge was dialed down to simply screwing with Swanky by sending him away to be an ambassador for a hostile alien planet, with his original goal of taking over the Earth not even being mentioned. In Season 2, Breet is absent altogether and his rivalry with the aliens was never followed up on again.
55* ''WesternAnimation/ReadyJetGo'': In "So Many Moons", Mindy mentions that her parents are thinking about having another baby. This could have set up an arc about Mindy preparing to be a big sister, but this was subsequently dropped and forgotten about in later episodes.
56* Lampshaded in ''WesternAnimation/RegularShow''. One episode ended with Huge Head, hiding in the bushes of the park, planning to steal Pops's identity as revenge for Pops accidentally doing the same to him. Several seasons later, it turns out he’s still waiting in the bushes plotting, and the main cast has noticed him and have stopped caring about it since he’s been there for so long. At the end of the episode, he interrupts the main plot to finally try and steal Pops's identity only to get sucked into the Ugly Hole [[ItMakesSenseInContext (don't ask)]] and clog it with his giant head.
57* ''WesternAnimation/RockyAndBullwinkle'' had a storyline about Boris counterfeiting cereal box tops to procure all the prizes from cereal promotions and ruin the world economy. This did not sit well with General Mills, the show's sponsor (and owner, who likely thought it was inappropriate case of BitingTheHandHumor), and "The Great Box Top Caper" was stopped after a few episodes.
58* ''WesternAnimation/TheSimpsons'':
59** Krusty the Clown was originally intended to be Homer Simpson in disguise in order to set up a story where Bart finds out that the clown he loves and idolises so much is actually his father (whom he doesn't get along with). This is why Krusty the Clown has Homer Simpson's exact body shape. However, this was dropped when the writers realised that Krusty would no longer work as a character once the twist were revealed to the audience. Instead, Krusty became just another Simpsons character and was used to satirise children's entertainers who pretend to be nice when in character but are actually [[NiceCharacterMeanActor depressed, trashy and corrupt behind the scenes]].
60** Following [[TheCharacterDiedWithHim the offscreen death of Bart's teacher Edna Krabappel]] in Season 25, Season 29's "Left Behind" saw the show's first attempt to replace her...with her husband Ned Flanders, who takes over Bart's class after his mall store, the Leftorium, goes bankrupt. Ned's new role only comes up in two subsequent episodes (Season 30's "Crystal Blue-Haired Persuasion" and Season 31's "Better Off Ned") before Season 33's "My Octopus and a Teacher" introduces new character Raychelle Peyton as the new teacher of the class, with no explanation as to where Ned went. The following season's "The Many Saints of Springfield" finally explains what became of him ([[ContinuityNod as in a previous episode in which he held a job at the school]], he was fired for mentioning Jesus in class), with plenty of LeaningOnTheFourthWall:
61--->'''Ned:''' It all started back when I was briefly Bart's teacher.
62--->'''Marge:''' You were Bart's teacher?
63* ''WesternAnimation/SouthPark'':
64** In "[[Recap/SouthParkS6E12ALadderToHeaven A Ladder to Heaven]]" and the rest of the season, Tweek is no longer treated as the fourth member of the main boys. While Butters got a whole episode dedicated to him getting kicked out of the group, Tweek received no such send-off — he's just suddenly not hanging out with Cartman, Stan, and Kyle anymore.
65** "[[Recap/SouthParkS16E3FaithHilling Faith Hilling]]": The plot with the cats conspiring to wage war against humanity is deliberately left unresolved by the end of the episode.
66** Darth Chef never appears again after "[[Recap/SouthParkS10E1TheReturnOfChef The Return of Chef]]" despite the fact that he is still at large after the episode ends. Chef's fully organic appearance in ''VideoGame/SouthParkTheStickOfTruth'' makes it borderline CanonDiscontinuity.
67** In the StoryArc of Season 20, nostalgia-powered sentient fruit called Member Berries are threatening a conspiracy that Randy Marsh eventually finds out about and teams up with Presidential nominee Mr. Garrison to stop. Unfortunately, the conclusion to this arc relied on [[FailedFutureForecast the presumption that Hillary Clinton would win the current election]]. [[RealLifeWritesThePlot When Donald Trump, whom Garrison was serving as a proxy for, won instead]], the plot is abruptly stopped by Garrison and Randy brainwashed by the Member Berries. The Member Berries then get to stay in the White House and [[WhatHappenedToTheMouse nothing is done about them in the end.]]
68** Season 23's "Season Finale" heavily involves a Mexican boy named Alejandro, who's been taken away from his real parents. He's treated as a ReplacementGoldfish by the White family, who have lost their son Jason, and even get an extra younger adopted brother to fill the void. Alejandro is intolerant of the abuse he faces and eventually snaps, destroying buildings and cars. He gets shot in the arm by the police, but manages to escape. We never see him again, and we don't know whether or not he managed to find his parents, or even if he's still alive. "Basic Cable" does show that Alejandro's brother still lives with the Whites, but that's as far as the arc has gone (as of ''The Streaming Wars Part 2'').
69** Season 24 is made of several hour-long specials. The first one, "The Pandemic Special", ends with South Park being ravaged by the pandemic, engulfed by forest fires, subjected to PoliceBrutality, with Mickey Mouse promising to get his revenge against Randy Marsh, Jimbo on life support at the hospital and [[ArsonMurderAndJaywalking everyone sporting moustaches]] as a result of smoking Randy's tainted weed. After the first special, every single one of these events but the pandemic is forgotten about. And then the pandemic itself gets resolved thanks to "[[DeusExMachina The Hollywood Elites]]" (AKA Creator/TreyParkerAndMattStone themselves).
70* ''WesternAnimation/StarVsTheForcesOfEvil''
71** In a season one episode, Star accidentally gave her friend Marco a monstrous, demonic tentacle arm that caused him to go on a rampage. The episode ends with the arm, as it transforms back into a normal limb, telling Marco that WeWillMeetAgain, as it's permanently a part of him now. While the arm is briefly alluded to in the season one finale, and later mentioned in at the end of season three as part of a quick joke, it fails to make a return appearance for the remainder of the series. After the series ended, the staff stated that there were numerous attempts to follow-up on that plot point, but they couldn't figure out a satisfying story.
72** The episode "Into the Wand" has Star learn hints about her mother's backstory, as well as that of three other queens of Mewni: [[AmbiguouslyEvil Eclipsa the Queen of Darkness]], [[WarriorPrincess Solaria the Monster-Carver]] and [[ShrinkingViolet Celena the Shy]]. Eclipsa becomes a major character in the last two seasons, Solaria is important to the backstory of the final BigBad, but Celena, and the comments about her [[TheseAreThingsManWasNotMeantToKnow hiding "cosmic secrets,"]] are never really expanded on. ''Literature/TheMagicBookOfSpells,'' published about two years later, [[LeaningOnTheFourthWall slightly calls attention to this]] in Celena's chapter, as Star's implies that she doesn't actually know any that important.
73** "Starfari" ends with Buff Frog becoming Mewni's new Royal Monster Expert. Buff Frog's following appearence has him with a lot of the other monsters choosing to leave Mewni and his new position is never mentioned again.
74** "Surviving the Spiderbites" ends with TheReveal that Globgor wasn't merely a HeroWithBadPublicity but a true Mewman-eating monster warlord that celebrated violence against mewmans and even ate them, was responsible destroyed the Kingdom of the Spiderbites and the death of King Shastacan, this culminates in Eclipsa revealing that she wants to restore the Magic Book of Spells which leads to Star starting to distrust her and hiding the remain piece of the book she possess so Glosaryck doesn't restore it. Despite this seeming like important developments, they are completely ignored by later episodes. Globgor's less moral actions are ignored in later episodes and is treated once again as just a NiceGuy and Star never seems distrustful of Eclipsa again. The restoration of the Book of Spells is touched in one other episode where Eclipsa succesfully restored and then she never uses it again.
75** After many episodes of [[ShipTease ship teasing]] Marco and Kelly's relationship, the two end up becoming "breakup buddies" (basically a G-rated version of FriendsWithBenefits.) in "Kelly's World", this is mentioned a couple of times [[OffscreenBreakup before is briefly mentioned they stopped doing it]] and their relationship is never touched again.
76** "A Spell With No Name" involves the titular spell going rouge and being established as a spell so powerful it could destroy the multiverse. The ending of the episode teases that while the situation was controlled, the spell would strike back soon. The spell is used once in a later episode and it never goes rouge again.
77* ''WesternAnimation/StarWarsTheCloneWars'': The Zillo Beast Arc towards the end of season 2 deals with the Republic seeking to study the titular beast, due to it's scales being virtually impenetrable against any conventional weaponry and the possibilities this could mean for armor development for starships and soldiers. At the end of the arc, the Zillo Beast is killed, but the scientist in charge of studying it is then given orders to clone it as well. Both of these plots would remain completely unresolved until over a ''decade'' later when the spin-off show, ''WesternAnimation/StarWarsTheBadBatch'', finally shows that the Empire did finally get around to cloning it. However, the initial reason the beast was even studied in the first place (for it's applications in armor development) apparently never went anywhere.
78* ''WesternAnimation/StevenUniverse'': The episode "Last One Out of Beach City" introduced a potential love interest for Pearl but despite "Mystery Girl" leaving her number at the end of it, she never showed up again.
79* ''WesternAnimation/TeenageMutantNinjaTurtles1987'': The episode "Raphael Meets His Match" introduced a character named Mona Lisa and ended with her moving to the sewers and the implication she would go on more adventures with the Turtles. [[ChuckCunninghamSyndrome She never appeared again]].
80** Similarly, "Muckman Messes Up" introduced the titular Muckman and his partner Joe Eyeball, and it ended with him telling Donatello to postpone coming up with a cure for his mutation so that he can enjoy his superhero career, implying that he'd show up as an occasional recurring character. [[ChuckCunninghamSyndrome He never appeared again]].
81* ''WesternAnimation/TeenageMutantNinjaTurtles2003''
82** One episode ended with the people of the USA becoming aware of the turtles' existence after the president came face to face with them and mistook them for aliens. This was never mentioned again. More glaringly, an ongoing plot in the series' sixth season, featuring CorruptCorporateExecutive Darius Dun, was aborted when the series was re-retooled and the turtles were sent back into the present.
83** A lot of the story arcs went nowhere due to ExecutiveMeddling. Not only was the sixth season's story (Fast Forward) supposed to continue so that it could wrap up the hanging threads there, but the shoehorned seventh season's story arc (Back to the Sewer) was also supposed to wrap up ALL loose plot threads in an arc called "The Shredder Wars"... before the series was canceled. Granted, the series was then finished off with a mega-crossover love letter to fans TV movie, but that never wrapped up anything other than the final fate of a couple of series regulars.
84* ''WesternAnimation/ToddMcFarlanesSpawn'': A Season 1 episode introduced a minor subplot about Angela, a warrior from Heaven who voiced her intention to hunt down and kill Spawn. Due to the notorious legal battle between Creator/ToddMcfarlane and Creator/NeilGaiman over ownership of the character, Angela never appeared on the show again, necessitating the creation of a [[SuspiciouslySimilarSubstitute similar character]] named Jade.
85* ''Every'' set of producers for the Creator/{{Hasbro}}-owned ''Franchise/{{Transformers}}'' had to deal with never knowing if their incarnation of the franchise be renewed or not, and every series got wrapped up in a hurry when the plug got pulled with little notice. Plot lines would also change suddenly, due to the desire of higher-ups to push new toys and promotions.
86** In the third season of ''WesternAnimation/TheTransformers'', Blitzwing began to have doubts about the Decepticon cause, and a deleted scene even has him considering joining the Autobots. The writers wanted him to become an Autobot in a later episode; however, the editors forced them to instead give this arc to the new toy Octane. (A close viewing of one episode featuring the character suggests that this change happened at the very last minute - Octane references events that happened to Blitzwing, and demonstrates a number of the latter's quirks like getting stuck while transforming.)
87** ''WesternAnimation/TransformersAnimated'', though ending fairly conclusively, had a bevy of plot threads LeftHanging, included Meltdown making a return, [[spoiler:Waspinator and Blackarachnia getting stranded in an uncertain location]], where [[spoiler:Sari's protoform came from]], and both Lockdown and Swindle [[spoiler:escaping]]. It should be noted that the cancellation that resulted in a number of these plots threads being unresolved was a mix of Hasbro's ExecutiveMeddling and being ScrewedByTheNetwork.[[note]]''Animated'''s last season was produced as Hasbro and [[Creator/DiscoveryChannel Discovery Communications]] were planning to combine forces and create their own kids channel called [[Creator/DiscoveryFamily The Hub]]. Creator/CartoonNetwork shared the rights of the ''Animated'' show with Hasbro, due to that incarnation being produced by their in-house studio. The end result was that Hasbro did not desire to continue the series when they [[WesternAnimation/TransformersPrime could just make a new one that they'd completely own]], and while Cartoon Network was given the option to continue ''Animated'' solo, they saw no point if they could no longer merchandise it.[[/note]]
88** This goes back to G1, where "The Rebirth" three-parter introduces a ton of new characters and situations... and suddenly has to ''wrap up the entire show,'' as during its production it was cut from ''a fourth season'' to a five-parter to a three-parter. The various comic series have faced the same problem, though with the [[ComicBook/TransformersGenerationOne Dreamwave Comics]] series, it had more to do with the death of the company itself. There's one exception to the rule: ''WesternAnimation/TransformersPrime.'' Despite all Hasbro's talk of the constant reboots ending in favor of a "[[Franchise/TransformersAlignedUniverse new, aligned continuity]]" producers plotted a three-season series with a beginning, middle, and end. When that end came a bit sooner than intended with season three's episode count getting cut down, it apparently didn't hamper them much. As such, we get the ''only'' western TF property to finish all it started and have a fully conclusive ending instead of a rushed wrap-up.
89** ''WesternAnimation/BeastWars'' mostly avoided this and, even after the third season turned out to be the last, managed to wrap things up pretty well, with the only major plotline to be truncated being Tarantulas and his feud with the Vok. It did, however, have a weird case of this where the beginning and resolution of an arc are there, but the middle part explaining how they’re connected got left out; season two has Dinobot back up his memories aboard the Axalon’s computer shortly before [[spoiler:he dies]] and in the finale, his evil clone [[spoiler:gains those memories after his connection to Rampage is severed]]. There was supposed to be an episode connecting those events where Rattrap would try to upload the back-up memories into the clone, but its script was rejected and the episode went unproduced, leaving the clone's fate in the finale a bit inexplicable.
90* ''WesternAnimation/WinxClub'': In the second episode of season 4, the Winx promise the pixies that they will take the last fairy on Earth (Roxy) to Pixie Village so a pixie can bond with her. They make it as clear as possible that this will happen, but it never did. The pixies don't even appear ''at all'' in the fifth season.
91-->'''[=Bloom=]''': Whoever the lucky pixie will be, we'll come back to introduce you to the new fairy. The last fairy on Earth.\
92'''[=Lockette=]''': Is that a promise?\
93'''[=Bloom=]''': That's a promise. Winx honor.

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