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8* ''WesternAnimation/OneHundredAndOneDalmatiansTheSeries'':
9** In the final episode, Willie's dog, whose owner runs the cult of alien worshippers, disappears halfway through.
10** In "Full Metal Pullet", Tripod has three friends who never show up again in the series, not even as background puppies.
11* In the ''WesternAnimation/AdventuresOfTheGalaxyRangers'' episode "Queen's Lair", a secondary character was forced to betray the Rangers because the Queen had [[IHaveYourWife his family held hostage]]. While the Rangers resort to an IndyPloy to work around this change in plans, we never do find out what happened to the poor man's family. Seeing as the BigBad is a classic GodSaveUsFromTheQueen, the things she's done to [[TheHero Zach's]] family, and the fact NeverSayDie was averted in the series...it doesn't look good for the poor bastard.
12* The original Chipette from ''Franchise/AlvinAndTheChipmunks''. Charlene was introduced one year before the others in 1982. She has a resemblance to Brittany and sung a duet with Alvin in [[Music/AlvinAndTheChipmunks "You're The One That I Want"]]. She was phased out when the other Chipettes were introduced. An unnamed chipmunk in the ''Rockin' Through The Decades'' special greatly resembles Charlene but has never been officially identified as her.
13* ''WesternAnimation/AmericanDad''
14** The episode "Hurricane!" has news reporter Greg get sucked up into the sky by the eponymous hurricane. A later scene has his boyfriend asking people if they've seen him, but it's not revealed whether he survived or if the storm killed him. Seeing as how he appears in the following episodes, he has in fact survived, but how he did was never explained.
15** Played for laughs in "Stan's Night Out." Stan counts on an intelligent mouse named 'Cheesers' to rescue him from the bad guys, but the mouse runs away, apparently abandoning him. The scene ends with Stan presumably losing a leg because of that. Next time we see Stan, he is back at work and just fine. When his coworkers ask how he escaped, Stan reveals the mouse in his pocket. "Cheesers came back."
16** In the first season episode “ Deacon Stan, Jesus Man” Steve gets pregnant with Roger’s baby after he does mouth to mouth resuscitation when he starts choking, at the end of the episode he makes out with his crush Betsy White resulting in her becoming pregnant with the alien baby, she goes to live with her grandparents until the baby is born, this storyline has never been revisited and she has never been seen or mentioned again in the nearly 20 years since it aired.
17* In the Season 2 finale of ''WesternAnimation/{{Amphibia}}'', "True Colors", General Yunnan and Lady Olivia mysteriously disappear roughly 15 minutes in. They return in Season 3 however.
18* ''WesternAnimation/TheAnimalsOfFarthingWood'':
19** Fox and Vixen's second son Friendly played a major role in the second season as well as when he was introduced. During Season 3 he appeared for the first three episodes but then went missing for the rest of the series.
20** In Season 2, both Mossy and Ranger have sisters who each stop appearing after an episode or two.
21* ''WesternAnimation/{{Archer}}'': Rip Riley (from Heart of Archness) and Kazak the dog were well-developed and well-received characters, both in fact being current or ex- Isis agents, and yet neither have reappeared.
22* ''Franchise/AvatarTheLastAirbender'':
23** ''WesternAnimation/AvatarTheLastAirbender'' had a lot of these that were eventually answered in the comics:
24*** The GrandFinale answered most questions but left three plot points hanging: [[spoiler:what happened to Ursa]], [[spoiler:did Toph ever make up with her parents]], and [[spoiler:Iroh's journey to the SpiritWorld]]? The first two points were later addressed in the comics, and the last in Book 2 of the SequelSeries ''WesternAnimation/TheLegendOfKorra''.
25*** There's also the final fates of [[spoiler:Smellerbee, Longshot, Long Feng and the Earth King.]] ''The Promise'' confirms the fates of three of those: [[spoiler:Smellerbee and Longshot are alive, having reassembled the Freedom Fighters to protest the Fire Nation's occupation, though we don't know how they made it out of Lake Laogai. Meanwhile, Earth King Kuei is back in place as King.]]
26*** After the culmination of [[spoiler: Azula's VillainousBreakdown in the GrandFinale, she's not seen again for the rest of the episode. ''The Promise'' reveals that she was sent to an asylum.]]
27*** When Iroh reveals to Zuko that [[spoiler:his maternal great-grandfather was Avatar Roku]] and said man was given the Crown of the Prince of the Fire Nation as a gift, Iroh then gives the crown to Zuko. It is never seen or mentioned again, and becomes somewhat moot [[spoiler: when Zuko is crowned as Fire Lord in the GrandFinale]].
28*** Speaking of Zuko, Lieutenant Jee and the rest of the crew of Zuko's ship is never seen or mentioned again after they're pressed into the service of Zhao to invade the North Pole. It's possible they died when "Koizilla" counter-attacked and wiped their fleet out but nothing is made of this possibilty by Zuko or Iroh, ending it on a particularly sad note as the crew were by and large [[PunchClockVillain pretty good people]].
29*** Early on in "The Fortuneteller", Aang presents Katara with a replacement necklace he wove out of Sokka's fishing line. Shortly after, the necklace unceremoniously disappears and Katara remains bare-necked until her original necklace is returned.
30*** Haru, Teo, and The Duke all but vanish during the "field trip with Zuko" episodes until they can be conveniently PutOnABus in "The Southern Raiders". Chit Sang, the prisoner from "The Boiling Rock", never reappears after the same bus ride in "The Southern Raiders", unlike the previous three, who came BackForTheFinale. It's equally probable that he got thrown back in prison, or that he [[ScrewThisImOuttaHere made himself scarce]].
31*** Towards the end of Season 2, Guru Pathik moves into one of the old Air Nomad temples, and he tries to help Aang control the Avatar State, but Aang leaves without mastering the final chakra for the Avatar State. He's only referenced ''once'' in Season 3, and it's while Aang was hallucinating due to sleep deprivation.
32*** Xin Fu and Yu's fates are left unexplored after Toph left them in the metal cage they used to trap her. Toph's father mentions in the comics that they returned without her, implying that they somehow escaped.
33*** After his premature partial HeelFaceTurn left Zuko in an AngstComa, Iroh tells him that "this fever is not a natural sickness" and that he will emerge from it as "the prince he was meant to be," which seems to suggest that there's more going on than mere stress, possibly something supernatural. However, this plot point is never elaborated, and Zuko returns to his jerk-y ways soon after.
34*** In the Book 2 episode "The Library", a history professor allows himself to be trapped in a mystical library with all the world's knowledge as it's pulled back into the spirit world (trapping himself with its giant, pissed-off caretaker). It wasn't clear to fans if the trip killed him, if Wan Shi Tong murdered him, or if he was still kicking it in the Spirit World reading. [[spoiler: Until ''Legend Of Korra'', where Jinora visited the library and found his skeletal corpse propped against a shelf clutching a book.]]
35** ''WesternAnimation/TheLegendOfKorra'':
36*** What happened to the Lieutenant after Book 1's finale? [[spoiler:Betrayed by his bending boss and thrown in a corner, never to be seen again?]]
37*** PlayedForLaughs when Varrick tells his horridly twisted account of what's happened in the series, where Bolin is the star and the villains are Unalaq, Vaatu, Zaheer, and Zombie Amon. Zombie Amon does nothing but take part in the telephone call where they discuss their evil plan and [[TheFriendNobodyLikes try to ditch Unalaq]] and then promptly vanishes from the story.
38----> '''Bolin:''' Wait! You ''like'' that?! It doesn't make any sense! What about Zombie Amon?! What happened to him, huh?! And-and-and-and stars are magic fairy dust?! Are you guys crazy?! Are you crazy?!
39----> '''Refugee:''' [[MST3KMantra It's just a mover. Don't overthink it. It's like a ride.]]
40* At the end of Season 3 of ''WesternAnimation/AvengersAssemble'', Ultron has possessed Tony Stark, so Dr Strange transports him to a dimension where technology doesn't work, but if he ever returns to our dimension, Ultron will reactivate. At the start of Season 4, there is no mention of Ultron, and everyone talks as if the only problem is finding a way to bring Tony back.
41* In ''WesternAnimation/{{Barnyard}}'', the story essentially revolves around Otis, his dad, and his pregnant, widowed love interest Daisy; Daisy later gives birth at the end of the movie. Come the spinoff series, ''WesternAnimation/BackAtTheBarnyard'', and both Daisy and her son are demoted to non-speaking background characters in early episodes. They're eventually never seen again, instead replaced with Abby, who becomes Otis's girlfriend.
42* A relatively unimportant example in the ''WesternAnimation/BatmanBeyond'' episode "Out of the Past" is at the beginning, when Terry and Bruce are watching ''Batman the Musical''. The Stage Batman picks up Robin from the chair, and he gestures up toward the Bat-Signal. When the camera pans back down, the six villains are all on stage, and Batman is center, but Robin is nowhere to be seen.
43** From another episode, Derek Powers is betrayed by his manipulative son Paxton, with the unwitting help of Batman. At the end of the episode, Batman hints that Derek is not dead, and we are also led to believe that Paxton will serve as a villain for the remainder of the series, or at least in the next season, in a similar capacity that his father did. Derek is never seen again for the rest of the series, and Paxton only appears in cameos.
44*** Blight pops up again in the tie-in comics, by now having degenerated so much he's forgotten his entire past life as Derek Powers. Batman and Stalker fight him, ending with [[spoiler: Blight being killed by molten steel.]]
45** In the episode "Inqueling", Inque is betrayed by one of her customers and severely wounded, enlists the aid of her spendthrift daughter to steal the mutagen required for her to heal, then in turn is betrayed by ''her'', this time fatally, so she could get at Inque's massive bank account. The episode ends with an unfriendly confrontation between Batman and the daughter which '''very''' strongly hints that Inque will someday return and seek vengeance. ("Why should I care? She's dead." "She's been dead before.") Aside from a cameo in an out-of-continuity Justice League crossover episode, Inque never showed up again.
46* One episode of ''WesternAnimation/BatmanTheBraveAndTheBold'' has Batman hit with a ray that gives him a copy of Plastic Man's powers. By the end, the ray is destroyed and the villain who made it is petrified. So Batman still has the stretchy powers unless he removes the power some other way. So... is this the dawn of Plastic Batman?
47* In ''WesternAnimation/BeastWars'', Airazor and Tigatron left to search out the downed stasis pods, then were captured by the Vok. While a few more stasis pods showed up, there were dozens that were never seen again. The IDW comics attempt to resolve the storyline of the missing stasis pods by having all the Transformers within emerge as either Maximals or Predacons thanks to the machinations of Razorbeast in a convoluted storyline involving time-space displacement and whatnot.
48** Considering that the planet that the series takes place on is [[spoiler:70% water]], it wouldn't be surprising if a great many of them were [[spoiler:crushed in the great pressures of the deep]]. Not to mention it is heavily implied that the "quantum surge" in the Season 1 finale destroyed or damaged most of the pods. The ones that created Quickstrike and Silverbolt were heavily damaged causing the scanner to fuse two beast modes together for them. More telling, early in Season 2 Rhinox comes across a "blank" stasis pod. This means the Spark of the protoform inside has been extinguished, meaning it is dead, which can lead the audience to assume the remaining pods that were not destroyed upon impact suffered the same fate. Rhinox basically says that as far as they know, all of the pods are dead after the surge. Tigatron and Airazor were going to go explore to see if there were any more, but he didn't sound hopeful. Tigatron and Airazor never found any, so we can assume they all died except for Silverbolt, Quickstrike and Rampage.
49** One pod was found in Season 3. It was a blank and Megatron used it to create Dinobot II, with half a spark of Rampage.
50** In the final season, a big deal is briefly made of [[spoiler:Megatron having the original Megatron's spark as well, as destroying him would cause a time paradox. Optimus Primal even prevents Tigerhawk from finishing him off because of this. It's never so much as mentioned ever again, as scene of them returning it was cut for time and can instead be viewed as a bonus feature of the DVD.]]
51* ''WesternAnimation/{{Centaurworld}}'' lampshades this. Throughout the show, there was a RunningGag where some of the characters would shoot [[MakesSenseInContext miniature versions of themselves out in droves]], with these tiny clones running away in panic. In the series finale, everyone learns that Comfortable Doug has taken all of them in form a personal army of sorts, and he proceeds to use them to aid in the final battle. As [[LogicalLatecomer Rider]] looks on in concern, Wammawink happily remarks that she's glad that plot point received actual narrative payoff.
52-->'''Wammawink:''' Oh! I'm so glad we tied up that story arc.
53* ''WesternAnimation/CodeLyoko''. Far too much of it.
54** Project Carthage is mentioned once at the end of Season 2 as Franz Hopper's former employer, possible origin of TheMenInBlack (who are themselves not explained) and motive for creating Lyoko and XANA... and is never mentioned again after that.
55*** It's revisited in (and is the main focus of) the [[AlternateContinuity novels]], thankfully.
56** Taelia. An exact doppelganger of Aelita, subject to many fan theories about her origins -- but never mentioned after "The Girl of the Dreams". It's unknown whether she's still a student at Kadic (though quite unlikely).
57** The wolf motif in Aelita's nightmares, where they are often seen chasing her -- or, for that matter, the whole sequence with wolves chasing Mr. Pück -- goes entirely unexplained in the show. The second novel reveals that [[AlternateContinuity (in this universe, anyway)]] [[spoiler:the wolf visions stem from Aelita's residual memories of Anthea's kidnapping, wherein Aelita was menaced by Grigory Nictapolus's Rottweilers, Hannibal and Scipio. Of course, Rottweilers and wolves have vastly different appearances, but it's wholly possible that, at age four, Aelita simply remembered the menacing dogs as wolves.]]
58** More minor example -- In "Double Take" at the end of the battle between Yumi and a XANA-possessed William, William has Yumi cornered with his sword. He then lowers it, approaches her, and begins stroking her face. Yumi pulls his hand away, and William pushes her off the cliff. The incident is neither explained (Trickery on XANA's part? William resisting XANA's control?) nor mentioned again.
59* ''WesternAnimation/CodenameKidsNextDoor'':
60** The show is usually good with continuity, which makes this oversight all the more damning: In "FUGITIVE", the operatives and the head of decommissioning, Numbuh 86, are going after an escaped operative, Numbuh 208, scheduled for decommissioning. Numbuh 86 briefly mentions sending their best spy, Numbuh 362, to infiltrate the Delightful Children's mansion (where 208 is entering). While inside, 208 escapes from 86 and was last seen running down the hall, then a similarly-dressed 362 runs back and is mistaken for him and captured. 362 [[AscendedExtra became a major character in her own right]], but the show never got around to answering what happened to the escaped operative.
61** We never find out whether or not Chad was transformed into a Senior Citizombie in ''WesternAnimation/{{Operation ZERO}}'', although it is implied that this happened to him eventually.
62** What happened to the Delightful Children from Down the Lane is also unknown, though with their final exit [[spoiler: [[KilledOffForReal it's assumed they drowned]]]].
63* ''WesternAnimation/CourageTheCowardlyDog'': In the episode "Ball of Revenge", Le Quack, one of the villains Eustace hired to kill Courage, suddenly disappears after the halftime show of a lethal dodgeball game without any explanation. Also, the clam that the weremole hid in isn't shown when the other villains crash through the floor.
64* At the end of ''WesternAnimation/TheCritic'''s run (at least a couple of seasons), Jay, who up to that point hasn't had much luck with women, was in a steady relationship with a mature, decent, likable woman, and despite a few stumbles, they were hitting it off great. Then comes the short-lived internet adaptation, and she's completely gone along with his son and longtime boss. The first webisode has Jay mention his "second divorce", implying that the relationship ended badly, but no details are given and it's still unknown what became of his son or (now former) boss.
65* PlayedForLaughs in ''WesternAnimation/TheCupheadShow'' when [[BigBad The Devil]] is forced to unleash his "third finest" demons to hunt down Cuphead after killing the first and second finest in fits of rage. One of the third finest is a cyclops with an eyepatch who is blind as a bat: unlike the rest of the demons who run to the carnival and are taken out one-by-one, the cyclops lumbers blindly into the forest never to be seen again.
66* ''WesternAnimation/DastardlyAndMuttleyInTheirFlyingMachines'': At the beginning of "A Plain Shortage of Planes", Dastardly's and Klunk's planes are destroyed when Muttley makes Zilly's crash into them and it kickstarts a plot about the lack of available planes for the Vulture Squadron. However, Muttley's plane wasn't damaged and it's never been confirmed Zilly's was. Neither plane has even been mentioned for the rest of the episode.
67* Two early episodes of ''WesternAnimation/DefendersOfTheEarth'' show Jedda projecting her powers through a "Pendant of Mystery". However, the Pendant's origins are never revealed and it disappears from the series as abruptly as it appeared, never to be seen or mentioned again.
68* Around the halfway point of ''WesternAnimation/TheDeputyDawgShow'', the characters of Ty Coon and Al E. Gator disappeared and were never heard from again.
69* In ''WesternAnimation/DextersLaboratory'', Mandark's sister Lalavava is never seen again after her only episode. Mandark becomes an only child afterwards.
70* ''WesternAnimation/{{Duckman}}'': King Chicken's wife Honey and daughter Tammy are introduced in "Cock Tales For Four". While Honey came back in the final episode, Tammy was not even mentioned.
71* ''WesternAnimation/TheFairlyOddParents'':
72** "The Boy Who Would Be Queen" established [[AlphaBitch Trixie]] as a closet {{tomboy}}, apparently setting something up between her and Timmy. This is never mentioned again.
73** At the start of "The Fairy Beginning", Timmy is trying to find a good look for his school photo. This causes Cosmo to bring out his yearbook of the Fairy Academy and show him peoples' pictures, which leads to the main conflict of him learning he never graduated because someone stole his final exam. This becomes the focus of the episode, and Timmy's school photo plot is never mentioned again.
74* ''WesternAnimation/FamilyGuy''
75** In the episode "You May Now Kiss the... Uh... Guy Who Receives" Chris' romance with the blonde girl vanishes after she talks to Chris outside the City Hall.
76** In the episode where the Griffin house gets possessed by poltergeists, Herbert the Pedophile fights back against a tree demon who is about to eat Chris and the two (Herbert and the tree) fall to their dooms after the tree splits the ground open. On the TV version, this counts as a "What Happened to the Mouse" moment because we never see Herbert or the tree for the rest of the episode. On the Season 4 DVD, however, [[spoiler:there's an extra scene where, after Peter ditches the cursed skull in the trash as The Griffins drive away, Herbert and the tree come out of the hole and apologize to each other for fighting. Herb then invites the tree over to his house and asks him if he's a "giving tree" or a "receiving tree"]]. Apparently, [[MoralGuardians the FOX censors]] turned this BrickJoke into a WhatHappenedToTheMouse moment because [[spoiler:they didn't approve of the anal sex joke implied in the "giving/receiving tree" line]].
77** In another episode where Chris is put on a diet, Stewie gloats in front of him about being able to eat whatever he wants and consequentially gains a ton of weight and grows increasingly listless as a result. [[spoiler:In the final scene with Peter in the hospital, Stewie is skinny again, with no mention of how he lost weight.]]
78** A small one happened after ''WesternAnimation/TheClevelandShow'' was cancelled. The Browns had a dog, Rock Hudson, but, ever since the Browns moved to Quahog, he hasn't been seen and it not said if they gave him away, lost him in moving, if he ran away, or if the writers of ''Family Guy'' writers [[ChuckCunninghamSyndrome lost him to writing lore]], besides one episode having Cleveland say, "That's a pet leash, if the good Lord decideth we should have one."
79** In the episode "Long John Peter," Chris is set up with a vet intern named Anna, only to blow it by trying to be a "bad boy" and failing at it. The episode ends with them reconciling after Chris apologizes. By the next episode, Chris is back to being single and Anna is never mentioned again.
80** In the uncut version of "And Then There Were Fewer" it's mentioned that Jillian is pregnant, but there's no follow-up to that after this episode.
81* ''WesternAnimation/{{Futurama}}'':
82** The Season 7 episode "The Bots and the Bees" features Bender having sex with a vending machine that gives him a son the next day. Said son, Ben, is never seen or mentioned again afterwards, not even in the GrandFinale.
83** In the last movie, ''Into the Wild Green Yonder'', towards the end, the eco-feminists break out of prison. While all of them leave, we only see [[NominalImportance Leela, Amy and LaBarbara]] getting picked up by the Planet Express ship, leaving it uncertain what happened to the others.
84** In "Yo Leela Leela," Leela creates [[spoiler:(read: rips off from a group of five aliens)]] a ShowWithinAShow aimed at preschoolers called "Rumbledy-Hump" that becomes a huge breakout hit. [[spoiler:After Leela fesses up that she didn't create anything, the producer turns it into a reality show starring the aliens themselves, also hiring all the orphans as members of the crew]]. However, there is no mention of any of this after that episode. On the same token, Bender is certified as a tugboat, which is also never brought up again.
85** In "Stench and Stenchability", Zoidberg manages to win the affection of an attractive woman with no sense of smell. And when she undergoes a nose transplant, [[ThrowTheDogABone she actually loves his horrible odour and the episode ends on a positive note]]. The show was cancelled for the second time shortly after this, but when it got {{Uncancelled}} a decade later, the ChristmasEpisode "I Know What You Did Next Xmas" established that Zoidberg is single again with no explanation.
86* ''WesternAnimation/FraidyCat'' most notably has terrible continuity when it comes to its episodes, most instances having characters not being shown again after a scene. Examples include:
87** In “A Scaredy Fraidy'', Fraidy meets Edgar Allen Crow. When Jackie the police horse chases Fraidy up the tree, Edgar disappears without any explanation.
88*** When Fraidy mentions that he’s in a cemetery, a bat flies onto a gravestone and has only one line. We get no mention of him ever again.
89** “Choo Choo Fraidy” has a minor character named Ruth the Buzzard fly towards a Wile E. Coyote parody, Smile E. Coyote, before the latter howls and causes Ruth to fall. She was never seen again after that scene.
90** Quite literally in “The Not-So-Nice Mice”. A gang of mice capture Fraidy and after a while, all but three disappear without any explanation. The remaining three include a giant mouse named Tiny, a gang member with a baseball cap, and the leader of the gang.
91*** Later on, we get no mention of the last two, with only Tiny remaining.
92** In “Cupid and the Cat”, Cupid accidentally shoots his arrow at Ant the ghost dinosaur and Chuck, Lulu’s boyfriend. After that, he isn’t seen again.
93** “Magic Numbers” has Cloud Nine shoot a lightning bolt at an old dresser with Fatty Catty and Long-tail still in it. They both pop out as toast-shaped cats, and they are never seen again, with no mention of them.
94** In the final episode, “A Semi-Star is Born”, Fraidy (who is disguised as famous TV star Boris the Cat) eats at a table with Mister Fred, Gentle Babs, Laffy, and Lawrence the lop-sided lion. In the scene after Laffy announces that the real Boris has come to the Animal Actors Retirement Home, Mister Fred and Laffy aren’t seen again.
95*** This happens a second time at the end of the episode. Lawrence conducts a [[ImpostorExposingTest test to see which Boris is real]], whereas both cats are given a food bowl. Being the picky eater he is, Boris turns his nose to the bowl, and Fraidy downs it. Boris doesn't get shown in the rest of the episode again.
96* In the U.S. Acres segment "An Egg-citing Story" of ''WesternAnimation/GarfieldAndFriends'' in the flashback to Booker and Sheldon's origin story three other chicks are shown with them, two of which are initially bullies to Sheldon but learn to accept him after he saves them from the Weasel, those chicks are never seen again outside of the flashback.
97* ''WesternAnimation/GoofTroop'':
98** Towards the end of "Unreal Estate", Goofy gets catapulted into the mountains, and that's the last we see of him for the rest of the episode, though he is back again unharmed in most later episodes.
99** In "E=MC Goof" Pete exits the rocket toward the sun to go after his "space souvenirs" and that's also the last we see of him for the rest of the episode. Negative Continuity means he's okay in the next episode, though.
100** At the end of "Date with Destiny", a relationship seemed to be starting between Goofy and Miss Pennypacker and Max seemed fully supportive of his dad dating his principal. She was never seen again afterwards.
101* ''WesternAnimation/GravityFalls'', despite being a mystery series, surprisingly has a few of these.
102** In "Double Dipper," Dipper makes numerous clones of himself to pull off a [[ObsessedAreTheListMakers circuitous plan]] to dance with Wendy. Naturally, the clones eventually rebel and Dipper [[ExpendableClone destroys them]] [[KillItWithWater with water]]. However, the plan involved Clones #3 and #4 going into the woods, so they actually weren't there when the others died. This goes unaddressed until [[spoiler:the WhereAreTheyNowEpilogue in the GrandFinale, which shows them living happily in the woods, wearing raincoats for protection from a storm]].
103** The same episode introduces [[AlphaBitch Pacifica]], who becomes a recurring character, and her GirlPosse, who receive no independent characterization and are never seen again.
104** In fact, Weirdmageddon was directly caused by Mabel being tricked by Bill Cipher possessing Blendin. None of the other characters ever find this out and it's never brought up again. Not even Journal 3 addresses this. It's finally brought up in the comics, but even then, the other characters don't find out about it.
105** An unimportant, yet notable one occurs in the episode ''Boyz Crazy'', [[spoiler:where Wendy suffers a nasty breakup with Robbie [[SurprisinglyRealisticOutcome and becomes mad at Dipper for asking her out for bowling shortly after]]]]. While the ending implies that [[spoiler:she'll eventually forgive Dipper]], such is never shown, mentioned, or even explained how as the two are immediately back on good terms in the episodes that followed.
106** Journal 3 reveals that [=.GIFfany=] survived "Soos And The Real Girl" and went into Rumble [=McSkirmish's=] game. Yet when Rumble [=McSkirmish=] is released during Weirdmaggedon, [=.GIFfany=] is nowhere to be seen. If they were in the same game, why would he be released but not her? Presumably one could chalk that up to "that" Rumble being from the arcade's cabinet, and not the one in the pizza place, but that just raises the question as to why there weren't two Rumbles ''and'' [=.GIFfany=] running around.
107** The purpose of the Zodiac and what it does is never revealed, even though it was briefly shown at the end of the theme song and its symbols were alluded to throughout the show's run. WordOfGod says it was never meant to be anything important anyway. That is, it was just a {{MacGuffin}}.
108** The Henchmaniacs of Bill, introduced as his friends in the GrandFinale, tend to randomly disappear at times; in fact, you'll never see all of the Henchmaniacs at the same time. For example, in the scene where they crash against the Weirdness Magnetism Law in "Weirdmageddon 2: Escape From Reality", only Paci-Fire, Zanthar, Pyronica, Hectorgon, Keyhole and Kryptos are seen crashing, but Lava Lamp Guy, Amorphous Shape, 8 Ball and Teeth are nowhere to be seen.
109** During the Shacktron battle againist the Henchmaniacs in "Weirdmageddon 3: Take Back The Falls", Hectorgon, Lava Lamp Guy and Amorphous Shape are the only Henchmaniacs who don't participate in the battle, in fact they're the only Henchmaniacs whithout a "Dark Evil Form".
110** After the Shacktron battle, 8 Ball and Zanthar disappear completely, we never see them again, but it's heavily implied that they were sucked by the rift, like the rest of the demons from the Nightmare Realm, after Bill's death.
111* In ''WesternAnimation/HighGuardianSpice'', Chompy the chest never appears again after episode 4
112* In ''WesternAnimation/TheJetsons'', Orbitty, the Jetsons' alien pet that was added in the second season, doesn't appear in the third season (aside from one cameo) or any of the movies.
113* ''WesternAnimation/JonnyQuest'' episode "The Fraudulent Volcano".
114** In the opening sequence, an old man manages to escape from the underground base. He doesn't appear at any subsequent point in the episode, and there's nothing to indicate that he contacted the authorities in any way.
115** When Jonny, Hadji and a police sergeant go off to rescue Dr. Quest and Race Bannon, the sergeant is attacked by two enemy guards and left in a heap. Jonny and Hadji take off and leave the sergeant behind and he doesn't appear again in the episode. It's not even made clear if the guards killed him or just rendered him unconscious.
116* ''WesternAnimation/JurassicWorldCampCretaceous'': In season 2, the campers go through a whole episode and fight off a ''T. rex'' to send off an emergency beacon in hopes of being rescued. After they're forced to leave, the audience sees the beacon clearly displays "Message Received." As of season 4, not only has there been no follow up to this, but groups who should have knowledge of a message--[[spoiler: Mitch and Tiff in season 2, using stolen Jurassic World tech; Dr. Wu's team in season 3, actual Jurassic World employees coming to retrieve his research; Mantah Corp employees in season 4, who have been committing corporate espionage against Jurassic World]]--don't bring it up, even in context of "Wow, that wasn't some fluke!". While Season 5 confirms that Mantah Corp did indeed receive the beacon, there is no follow-up on why no one on the mainland (who the emergency beacon was presumably intended for) ever received and answered the beacon.
117** Several species, variants of certain species or even individual dinosaurs that either did not appear in the previous ''Film/JurassicPark'' / ''Film/JurassicWorld'' movies and debut or returned after a long absence in the show but have yet to return post-''Film/JurassicWorldFallenKingdom''. Leaving it uncertain if they perished on Isla Nublar prior to or during Mount Sibo’s eruption or if they were among the rescued dinosaurs that escaped Lockwood Manor.
118*** ''Ouranosaurus'', which first appeared in season three in "Safe Harbor" and was last seen in a blink-and-you’ll-miss-it cameo among a herd of stampeding dinosaurs in "Eye of the Storm".
119*** ''Monolophosaurus'', which first appeared in the third season in "Casa De Kenji" and was last seen when a pair were lured by Brooklyn in "Stay on Mission".
120*** ''Ceratosaurus'', which first appeared back in ''Film/JurassicParkIII'' and after a long absence returned in the "The Watering Hole" and would make subsequent appearances throughout the series until they were last seen on Nublar in the season 5 episode "Clean Break".
121*** Bioluminescent ''Parasaurorolophus''. A herd of them first appeared in the first season in "Welcome to Jurassic World" and after a various appearances where several of them were killed the Scorpius Rex, an individual was last seen in the season three in "Stay on Mission".
122*** Chaos the ''Baryonyx'', who first appeared alongside her siblings/pack-mates Grim and Limbo in the second season in "The Art of Chill" and subsequently menaced the main characters as a group on several occasions until [[spoiler: Grim was shot by a EvilPoacher and later Limbo was stolen and relocated to another island where she seemingly died while fighting a ''Tyrannosaurus'', with Chaos as the SoleSurvivor of her pack,]] making her last appearance in the fifth season in "Clean Break".
123*** ''Tarbosaurus'' which has made its first and only appearance in the CYOA interactive episode "Hidden Adventure".
124* ''WesternAnimation/JusticeLeague:''
125** Supergirl's clone Galatea didn't seem dead upon her final defeat, but no one sees her again, nor is she ever mentioned. Considering she had a burn mark through her stomach, she was twitching, and had a comatose look on her face, she might as well be dead. Although she's a ''Kryptonian'' clone with a ''Kryptonian'' HealingFactor, so any damage not done to her brain should've healed itself eventually.
126** Amazo, turned near-godlike from sheer information absorption and PowerCopying, ends up having to teleport himself away when he realizes that episode's threat (a [[CameBackWrong badly-resurrected Solomon Grundy]]) was only getting worse with his presence, by absorbing the chaos from his powers. He was never, ever seen again in the series, and no one ever asked where he went again; a cut scene planned to show him post-finale, floating in the middle of space multiple parsecs away, wondering if it was safe to come back.
127* At the end of the ''[[WesternAnimation/KaBlam Life With Loopy]]'' short "Larry's Girl", Larry starts dating a girl at his school, Stacey, [[BirdsOfAFeather from their mutual interest in]] [[ShowWithinAShow The Charlie Chicken Show]]. She is never seen nor mentioned again for the remainder of the series.
128** At the end of "Goldfish Ghost", [[ItMakesSenseInContext a stray cat finds the ghost of Loopy's goldfish and starts chasing after him.]] After the fish gets away, Loopy notices how hungry the cat was, feeds it, and appears to take it in as her new pet. The cat is never seen after the episode, nor is it mentioned. However in the final episode, "Rock 'N Roll Loopy", a litterbox can be seen briefly in one scene which may imply they still own the cat.
129* ''WesternAnimation/{{Kaeloo}}'': In Episode 56, Mr. Cat cons Olaf out of 6000 dollars. While he is eventually [[LaserGuidedKarma punished]] for it, we never find out if he ever returned the money.
130* ''WesternAnimation/KimPossible'':
131** An early episode had Kim and Señor Senior Jr. finding out they were a perfect match through a matchmaking fad. The episode ended with Kim finding her locker full of flowers and an e-card from Junior saying he awaited seeing her again. This was never brought up again; no StalkerWithACrush storyline, no FoeRomanceSubtext (well, [[LesYay none from Junior]]), nothing. It just disappeared.
132** The reason? Until the [[UnCanceled fourth]] [[PostScriptSeason season]], the producers said the show only had "continuity by accident". Despite the odd ContinuityNod, [[NegativeContinuity the board was reset for every episode]] -- [[CollapsingLair evil lairs destroyed]], [[CardboardPrison villains sent to jail]], [[AesopAmnesia lessons learnt]]: all undone for the next time they were needed.
133** One episode ends with a army of monkey ninjas pledging their loyalty to Ron, never to be seen again. Amazingly, the reason ''why'' they pledged their loyalty to Ron (which, at the time, was treated as a one-off joke) turned out to be a significant recurring plot element that even played a major role in the finale, but Ron still doesn't have the loyal monkey flunkies.
134** Many fans were curious what happened to Ron's short-lived interest Zita after only two appearances. She comes back in the finale without so much as a line, [[PairTheSpares as a couple with fellow B-character Felix]].
135* ''WesternAnimation/KingOfTheHill'':
136** Several episodes had Bobby meet a girl and presumably ended up going out with her at the end. The next episode has him single again with no mention of the girl ever again (except for one girl, who was referenced in another episode and Connie, who was already part of the main cast when they broke up).
137** Bill is also like this. In one episode he's dating Kahn's mother and mentions that he's still dating her in another one. Then, all of a sudden, he's single and lonely again. They dropped her because they decided they liked Bill as his lonely, pathetic self. Makes sense, but it would've been nice if they had actually provided an in-show explanation for her disappearance.
138*** Kahn's Mom is another example, after her initial appearance, she is shown several times in the background at her son's house, but then sort of vanishes, and a passing reference implies she went back to Laos.
139*** ItMakesSenseInContext as Connie's thuggish cousin Tid Pao, a character that did receive some closure (the Season 7 episode "Bad Girls, Bad Girls, Whatcha Gonna Do") was sent to go live in the Midwest where she was last seen shoveling cow manure on another uncle's farm. Kahn's mother returning to Laos would mean that uncle's word of warning would still hold water as if she was to make trouble, she would be leaving the country to go live with her. Bill may not have [[DidNotGetTheGirl stayed with her]], but Connie's cousin can still learn from [[RayOfHopeEnding her past mistakes]].
140** Several plot motivations were also forgotten during the course of an episode in the series. One such example was from "The Courtship of Joseph's Father", where Dale Gribble has Joseph attend Spencer Academy over Arlen High School due to the fact that he was a great football player. The sole reason for Joseph being able to attend Spencer Academy (playing for the varsity squad) was never discussed while he attended the school.
141** "Returning Japanese" had a subplot where Luanne, watching over Ladybird while the rest of the Hills were out in Japan, thinks that she had died and gets [[ReplacementGoldfish a new, identical bloodhound]]. However, upon attempting to transfer Ladybird's collar to the new bloodhound, Ladybird jumps up and Luanne soon gets confused as to which one is which. The closest thing this got to any resolution was Luanne walking both of the dogs (using color-coded collars) and thinking of using the excuse that she learned cloning at community college. The other bloodhound is not mentioned in any later episodes.
142** The Season 12 episode "Untitled Blake [=McCormack=] Project" reveals that John Redcorn has another child with an old fling, who developed a friendship ([[SurpriseIncest and budding romance]]) with Joseph. The episode ends with John Redcorn and the mom moving in together, but these characters are never seen again.
143* In ''WesternAnimation/KongTheAnimatedSeries'', no final fate for Tiger Lucy is given. In the final two episodes, every other enemy is defeated one way or another, but Tiger Lucy, the fourth of De La Porta's henchmen (who has the least screentime of the four) is never seen nor mentioned in the final episodes.
144* ''WesternAnimation/TheLifeAndTimesOfJuniperLee'':
145** Whatever happened to those clones of June's friends? We see Ophelia's clone shopping at the same music store as the original but what happened to the others?
146** Also, the turtle in "Little Big Mah" [[spoiler: that was used to defeat the villain.]] The energy-syphoning Darnock demon sucked up all those turtle years but where did the turtle itself go? Not to mention, it wasn't even a random turtle, but one that Ray Ray was supposed to return to a friend during the episode. It's never mentioned again.
147* In the Creator/UbIwerks cartoon “Little Boy Blue” one of Little Bo Peep’s lambs is kidnapped by The Big Bad Wolf who intends to eat her, Bo Peep, Little Boy Blue, and a scarecrow go off to rescue her, the last time the lamb is seen is when the wolf drops her after the scarecrow tackles him, she is never seen again for the rest of the cartoon, even though the wolf locked his house preventing her from getting out.
148* ''WesternAnimation/TheLoudHouse'': In "Lincoln Loud: Girl Guru", Liam gets a girlfriend. However, she's never seen again and in "Dance, Dance Resolution", he's back to being single.
149* Mario cartoons:
150** In several episodes of ''Series/TheSuperMarioBrosSuperShow'' King Koopa will turn a person into a pile of bricks using magic. Sometimes these people will get turned back by the end of the episode, sometimes they are forgotten about.
151** In the ''WesternAnimation/TheAdventuresOfSuperMarioBros3'' episode "Reptiles in the Rose Garden," a bunch of kids get turned to stone by King Koopa. At no point do they get turned back.
152* ''WesternAnimation/MarthaSpeaks''
153** In the episode "Martha's Dirty Habit", [[TalkingAnimal Martha]] and Helen's dad Daniel Lorraine make a deal: if she gives up digging, he will give up snacking. The episode ends with Daniel still trying not to snack but wanting to, and in the next episode he's acting normally again. We never find out what became of Daniel and his plans to give up snacking.
154** At the end of "There Goes the Neighbourhood", [[CuteKitten Kitten]] gets adopted. We never find out who adopted him, although we do know they live in the neighbourhood.
155** In "Martha's Life in Crime", that shows [[WholeEpisodeFlashback how the Lorraines got Martha]], they're seen almost adopting a cat instead. It's never revealed what happened to the cat, though seeing as she's not seen in "Ain't Nothin' But a Pound Dog", and the pound is evidently a no-kill shelter since Pops was living there for years, it's safe to say that she was adopted.
156* ''WesternAnimation/MightyMax'' examples:
157** The Conqueror, after being defeated by Norman, has been set free of his never ending cycle of fighting, and wishes to join humanity (though humans flee from him out of fear, which rather irritates him). He's never seen, heard of or mentioned again after that. Apparently, eight foot tall humanoid talking lions just wandering about is [[UnusuallyUninterestingSight no cause for attention]].
158** In the episode "I, Warmonger", Skullmaster orders his dragon to leave after it takes him and Warmonger to Zero Island. This is the third and final time said dragon is seen in the series, (the first two times being the very end of "Pandora's Box Part 2" and most of "Blood of the Dragon" respectively), and it doesn't reappear in the series finale, nor is it even acknowledged.
159** In "Zygote’s Rhythm," an elderly tourist couple is hit by a devolution ray and turned into apes. They are never turned back.
160* ''WesternAnimation/MollyOfDenali'': In "Sticker Shock," Tooey hurts Molly's feelings when he doesn't leave a seat for her at the picnic table. Tooey says he wants to apologize to Molly for what he did, but he never gets to by the end of the episode.
161* Essentially every Pony in the pilot episode to ''WesternAnimation/MyLittlePony'' didn't appear in the series spinoff; mainly Firefly, Ember, Twilight, and Applejack. They were major to the plot, saving everyone in Pony-Land from being turned into slaves, but they were never mentioned again. There were, however, comics in the UK where they did appear. Ironically, Firefly, Twilight and Applejack were the inspirations for three of ''WesternAnimation/MyLittlePonyFriendshipIsMagic'''s mane six (namely Rainbow Dash, Twilight Sparkle, and Applejack, who was the only one whose name was kept unchanged).
162* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
163** Trixie turned Snips and Snails into babies during her second battle against Twilight in ''[[Recap/MyLittlePonyFriendshipIsMagicS3E5MagicDuel Magic Duel]]''. They are never seen getting turned back into their normal ages, though given they show up as normal in later episodes, one can assume that the spell was somehow reversed.
164** The "[[LivingShadow Pony of Shadows]]" who appeared at the end of ''[[Recap/MyLittlePonyFriendshipIsMagicS4E3CastleManeia Castlemania]]'' has yet to be mentioned again. There's debate amongst fans whether or not he was Lord Tirek, and when asked about it Jayson Thiessen's [[https://twitter.com/goldenrusset/status/465223414631116800 response]] was [[TeasingCreator less than helpful]]. An ''actual'' Pony Of Shadows, actually a corrupted unicorn named Stygian, appears much later in the series but is an entirely different character (he was imprisoned during the events of ''Castlemania''), leaving the identity of whoever or whatever it was under that cloak a complete mystery.
165** ''[[Recap/MyLittlePonyFriendshipIsMagicS4E23InspirationManifestation Inspiration Manifestation]]'':
166*** Exactly what ''did'' happen to the evil spell after it was driven out of Rarity, since the TomeOfEldritchLore was (presumably) destroyed? Assuming that breaking the spell didn't destroy it entirely, of course.
167*** What of the transformed band, turned into background ponies we've seen before? Are there two Octavias out there, one of which doesn't know used to be a very different, very male pony?
168** In ''[[Recap/MyLittlePonyFriendshipIsMagicS4E26TwilightsKingdomPart2 Twilight's Kingdom Part 2]]'':
169*** Tirek's brother is mentioned a number of times, and depictions of him are shown in a storybook, but never makes an actual appearance. Unless Tartarus gives Tirek enhanced longevity, his brother should still be around. Though considering he went back to wherever he came from and there is no easy means of long-distance communication except between Spike and Celestia, they might just not have been able to find him.
170** ''[[Recap/MyLittlePonyFriendshipIsMagicS5E9SliceOfLife Slice of Life]]'' has several:
171*** Matilda asks Amethyst Star for help planning her wedding, but Amethyst Star disappears and is never mentioned or heard from again.
172*** Matilda is worried about her wedding, with several scenes (including one with Steven Magnet) reinforcing this, but it is never mentioned, referenced, or resolved in the final third of the episode.
173*** Octavia and Vinyl Scratch never actually play their piece at the wedding.
174** In "[[Recap/MyLittlePonyFriendshipIsMagicS2E21DragonQuest Dragon Quest]]," after her stubborn (and also hilarious) refusal to watch the dragon migration, Fluttershy [[OutOfFocus disappears from the episode entirely]], and is not seen or heard from again until [[Recap/MyLittlePonyFriendshipIsMagicS2E22HurricaneFluttershy the next one]] (considering she's the star of it), save for one of Spike's pictures in the end.
175** After her [[ATwinkleInTheSky Team Rocket Style Sendoff]] in ''The Washouts'', Lightning Dust is never seen or mentioned again in the series despite her insistence that she and Rainbow Dash are [[TheRival rivals for life]] implying she'd be back for round 3 at some point.
176** The last you ever see of the Tree of Harmony's sentient form, an ethereal Twilight Sparkle, is in "Uprooted" when it explains how the actions of the Young Six have brought it back to life and made it stronger than ever due to their friendship. It plays no role in the series after that, is never mentioned again, and doesn't even appear during the BigDamnHeroes moment in the {{Series|Finale}} or DistantFinale.
177* ''WesternAnimation/NinaNeedsToGo''
178** In "Play", Nina is about to rehearse her line, but is distracted by a PottyEmergency. At the end, she cannot remember her line and [[ThrowItIn ad-libs]] by saying her CatchPhrase instead. We never find out what her actual line was.
179** In "Train", the main characters are on a train. We never find out what their destination is.
180** In "Library", we only hear the beginning and end of the story the librarian reads. Never the middle.
181** In "D.I.Y.", Nina's dad is looking for paint in the hardware store. He finds some in the right colour but it spills all over him. We never find out if he got more paint.
182* ''WesternAnimation/TheOwlHouse'': There are many in "King's Tide":
183** Principal Bump is never seen or mentioned despite vowing to protect his students from the Day of Unity. The only reference to him is when Eda imagines the younger versions of Raine and Lilith alongside Bump when he was a vice-principal. Though we later learned what happened to him in the later episode, "For The Future".
184** Speaking of which, none of the students from Hexside make an appearance at all, raising questions on where they currently are and how they're going to cope with everything post-Draining Spell and under the Collector's reign. Though just like above, we later learned what they were doing during the Day of Unity in "For the Future".
185** When Lilith, Derwin, Katya and Hooty are captured, Amber and Steve are curiously not among them.
186** When the Collector ends the Draining spell, we see the inhabitants of the Isles recover, but not Eda and the Coven heads.
187** The last we see of Alador is him trying to fend of the Abomatons when the Draining Spell takes effect on him. It is not clear if he gets captured or is able to escape.
188** Despite last episode ending with Odalia planning to find a new business partner, she never shows up in this episode, so it's unknown what her reaction would be to finding out that selling out her family and all of witchkind to become royalty was AllForNothing.
189** It's somewhat unclear if the Palismen for Willow, Gus, Amity and Hunter or Luz's egg were also knocked through the portal before it closed. We later learn that they were indeed knocked through the portal in the next episode "Thanks to Them".
190* ''WesternAnimation/ThePenguinsOfMadagascar'':
191** In ''WesternAnimation/TheMadagascarPenguinsInAChristmasCaper'', there are camels and two elephants living in the zoo. Camels are never shown in the show and Burt is the only elephant living in the zoo.
192** Before Savio was introduced, there was a different snake living in the zoo that's nowhere to be found in later episodes.
193* ''WesternAnimation/PhineasAndFerb''
194** In "The Fast and the Phineas":
195*** When Isabella brings the Fireside Girls to be Phineas' pit crew, Milly is strangely not seen during the pit stop.
196*** When the car gets taken through the car wash by Perry, it removes all the exterior modifications and leaves it sparkling clean which Linda loves; however, the boys also swapped the engine, which could ''not'' have been removed by the car wash.
197** In the episode "I, Brobot", Candace captures one of the Ferbots in a sack, and it then gets picked up by the garbage collectors behind her back. We never see what happens to that Ferbot afterwards. Also, we also don't see what happens to the Candroid after the episode.
198*** Perhaps the Ferbot got sent away to the place [[WesternAnimation/ToyStory3 where all trash]] [[FridgeHorror ends up.]]
199** When the boys set [[Literature/CharlieAndTheChocolateFactory Oompa Loompa-like Ba-Dink-A-Dinks]] free, they promise to "lay waste to the surface dwellers." But it's a one-shot gag -- so far, their plot thread hasn't been resolved. They've had a few minor background appearances in subsequent episodes, but... not knowing where they are can be pure horror.
200** In the episode "Run, Candace Run", the conflict is that Candace has made too many promises to her friends, family and boyfriend, and she has to accomplish multiple tasks in one day. One of those was apparently something involving her and Stacy on stage in a cow costume, however, Candace seemed to forget all about that, as we never see her do it and it is never addressed again.
201** Halfway through "No More Bunny Business" when the trio goes inside to order carrots, Ferb and Isabella disappear for the rest of the episode.
202** In "Night of the Living Pharmacists", Norm appears briefly at the beginning, and then leaves for the rest of the episode. Near the end of the episode, we also never find out what happened to Perry and the other O.W.C.A. agents after everyone in Danville is turned back to normal.
203* ''WesternAnimation/ThePiratesOfDarkWater'': The Lugg Brothers just sort of disappear after leaving Zoolie's gamehouse with Konk in the miniseries. Konk is later delivered to Bloth in a barrel by some woman, and the Lugg Brothers are never seen or mentioned again.
204* In one short starring WesternAnimation/PlutoThePup, ''WesternAnimation/PlutoAndTheArmadillo'', Mickey and Pluto visit Brazil, where Pluto meets a female armadillo in the jungle. The armadillo instantly takes a liking to Pluto, but he initially distrusts it, but eventually grows to love it. The short ends with Mickey dragging Pluto and the Armadillo (who is at the moment [[BeTheBall rolled up into a ball]]) onto the plane, only to discover once it takes off that the "ball" in his hands is actually the armadillo. Despite this, the armadillo never shows up again in any other Pluto shorts.
205* In ''WesternAnimation/TheProudFamily'' episode "[[Recap/TheProudFamilyS2E23CultureShock Culture Shock]]", Penny befriends a Muslim girl and her family as part of a school project on racial diversity. One night, the Prouds and the Muslim family return to the latter's home to find that someone [[{{Egging}} vandalized]] [[ToiletPaperPrank it]] and scrawled a racist message on the garage door (in the original version, it read, "GO HOME, TOWELHEADS!"; in the reruns, the message was digitally altered to just read, "GO BACK TO YOUR COUNTRY!") to their shock and horror. While this does lead to Penny making a speech at school the following day about how Muslims have been discriminated against more thanks to the 9/11 attacks, and that doing so is wrong, viewers are still left wondering who vandalized the house in the first place.
206* In ''WesternAnimation/ThePrinceAndThePauper1995'' Tom's father vanishes halfway through the film and is never mentioned again, making him this and a KarmaHoudini.
207* In the ''WesternAnimation/ReadyJetGo'' episode "Beep and Boop's Game", the DSA scientists want to know if a mountain on Mars is really a volcano. By the end of the episode, we never do find out if it was a volcano or not.
208** In “[[Recap/ReadyJetGoS2E15MyThreeSunsMagnetPI Magnet, PI]]", we never find out what Mitchell's "top-secret" detective case was. When he appears again at the end of the episode, he only wonders why Sunspot appears to be tap-dancing on the ceiling, and is then dragged away by Cody.
209* This was the case with the original airing of ''WesternAnimation/RudolphTheRedNosedReindeer''. After it aired, Creator/RankinBass received a lot of letters from children asking whatever happened to the Misfit Toys, who weren't rescued and never mentioned again after their scene. In response, they created a new scene for the end credits that showed Santa rescuing the Misfit Toys and delivering them to children, which has been the version that aired ever since. On the other hand, this leaves Yukon Cornelius licking the end of his pick unexplained -- to make room for the new scene, the punchline to the aforementioned build-up had to be cut. (He was hunting for a peppermint vein, in case you were curious.)
210* ''WesternAnimation/SagwaTheChineseSiameseCat'': Ping-Wing the pigeon, the magistrate's pet, completely vanished after her first appearance.
211* ''Franchise/ScoobyDoo:''
212** In ''WesternAnimation/ScoobyDooAndTheReluctantWerewolf'' Shaggy has a girlfriend named Googie, after the events of the movie she is never seen again.
213*** Googie is one of several new love interests introduced in the Superstars 10 films (Snulu for Boo Boo, Desert Flower for Huck, etc.) which originally they had planned to make a whole other set of Superstars 10 films with some sequels to the previous batch. But near all those got pushed to the wayside in the Turner buyout, turning most of the characters to forever be lost mice.
214** Most tag-alongs such as [[TheScrappy Scrappy]] and [[EthnicScrappy Flim-Flam]] don't appear that much. Scrappy appears in some movies (where he's actually pretty tolerable) and Flim-Flam is completely absent after ''WesternAnimation/The13GhostsOfScoobyDoo'' (although he reappears in WesternAnimation/ScoobyDooAndTheCurseOfThe13thGhost).
215*** ''WesternAnimation/ScoobyDooMysteryIncorporated'' did go TakeThat on them saying Flim-Flam was doing 25 to life after some major con that he pulled. And as for Scrappy? [[WeShallNeverSpeakOfThisAgain The gang refuses to speak of him.]]
216** When the show was changed in the 80s there was no mentioning of what happened to Fred, Daphne and Velma. when Daphne returned to the show her exit was worked into the new premise but not explicitly stated on the show (she had gotten a job as a reporter). When Fred and Velma returned briefly in 1984, it was disclosed that Fred became a mystery writer and Velma was an intern at NASA.
217* ''WesternAnimation/TheSimpsons'' does this a lot, which isn't suprising since it's known for the HalfwayPlotSwitch. Whatever happens in the first act to get the actual plot running will never be mentioned again. Or if it is, it'll be to [[LampshadeHanging hang a lampshade]] on that the story's moved on and no-one's interested any more, like the badgers in "A Tale of Two Springfields".
218** Or the first part of "Tennis the Menace" where Homer buys a burial plot for Grampa Simpson, but ends up creating a tennis court in the backyard after a coffin salesman tells Homer that his backyard needs to be the size of a tennis court if he's thinking of burying Grampa there. Or the first part of "The Cartridge Family," where the plot goes from the family trying to survive a town-wide soccer riot, complete with fighting and houses being burned to a very special episode (a Simpsonized version of it, anyway) where Homer buys a gun for protection and drives Marge and the kids away because of how irresponsible he is with it?
219** The bagboy strike on "Simpson Safari" that was abandoned for yet another "The Simpsons are Going to [Insert Country/Continent/State Here]" plot. That episode [[LampshadeHanging hung a lampshade]] on it. After having lost their guide and become stuck on a boat floating down a river, Homer wonders if the bag boys have resolved their strike. The episode is later dedicated to the bag boys of America, "whose ineptness and greed were the inspiration for this episode".
220** In "Homer and Apu", Apu takes a bullet for Creator/JamesWoods (ItMakesSenseInContext), says his last words and then we see him make his recovery in a hospital along with Woods before the episode ends. The assailant, who could've very well shot again at his initial target, isn't shown again. [[spoiler:Neither is James Woods.]]
221*** James Woods does eventually have a cameo in the Crossover with ''WesternAnimation/FamilyGuy''.
222** In "The Itchy and Scratchy and Poochie Show", the ''Itchy and Scratchy'' producers are trying to introduce "Poochie", the show's new marketing-driven dog. A test audience sees Itchy and Scratchy driving to a fireworks factory. When they're about half a mile away from it, Poochie appears and begins doing all sorts of "cool" activities like skateboarding and playing basketball. Milhouse, who is watching the show at The Simpsons' house, screams "When are they going to get to the fireworks factory?!?" At the end of the episode, Poochie steals Itchy and Scratchy's car and drives off.
223** In "One Fish, Two Fish, Blowfish, Blue Fish", Homer is diagnosed with death in 22 hours. Having nothing to lose, he accepts Ned Flanders' invitation to a barbecue he doesn't want to go to. But at the end of the episode it's shown that Homer survives. The last shot of the episode is him eating chips and watching TV; the barbecue is never mentioned at all. The commentary discusses a deleted final scene where Homer has to deal with all the consequences of what he thought was his last day alive: not only is he stuck at the barbecue, but his father now wants to spend lots of time with him rather than having accepting their distant relationship, and Mr. Burns has some harsh words for him after Homer insulted him.
224** After "Two Dozen and One Greyhounds", She's the Fastest just vanishes and is never mentioned again.
225** Also, in "Insane Clown Poppy" Krusty seems to have a pretty strong relationship with his daughter at the end, who just vanishes next episode. She eventually reappears in "The Nightmare After Krustmas," over 16 years later.
226** The half-greyhound half-poodle puppy Krusty gets from the Simpsons in "Today I Am a Clown" has yet to be seen again.
227** In the episode "Like Father, Like Clown," Krusty's assistant, Lois Pennycandy obviously holds a torch for Krusty, but this has never been referenced or referred to again.
228** Herb Powell, Homer's long-lost half-brother appears in two episodes early in the show's run, "Oh Brother, Where Art Thou?" (Season 2, Episode 15) and "Brother, Can You Spare Two Dimes?" (Season 3, Episode 24). After the second, [[spoiler:in which he regains the fortune of which Homer's blundering deprived him in the episode wherein we meet him,]] he all but vanishes. They later lampshade this, when Homer mentions in passing "my seldom-seen brother, Herb."
229*** Apparently Marge and/or Homer still know ''where'' he can be contacted, they just haven't had a reason to in a while. In "Changing of the Guardian", (''Season 24'', Episode 11, ''22 seasons'' after BCYSTD), they consider him as a potential guardian for the kids in case of their unanticipated demise, but discount him [[spoiler:because he's poor again]].
230** And in "Days of Wine and D'oh'ses" What Happened to the Bear? [[WordOfGod The commentators]] would also like to know.
231** [[WordOfGod The commentators]] also want to know what happened to the Scottish woman that Willie meets in the episode "Whacking Day."
232** In "Homer At The Bat", Ozzie Smith ends up visiting a literal tourist trap, the Springfield Mystery Spot, which turns out to be some kind of NegativeSpaceWedgie, and he promptly falls into it. In the snapshot at the end we can see his specter hovering over the rest of the group (presumably invisible to all save the viewers). We never find out if he managed to escape the Mystery Spot, [[OffscreenInertia so as far as we know he's still falling through space and time...]]
233** It is also never revealed what happened to Scorpio after taking over the east coast and giving Homer a football team in "You Only Move Twice" as reward for helping his scheme.
234** Viewers with long memories will remember "Bart Gets Hit by a Car", particularly the scene where Bart goes to Hell. The Devil looks him up on a computer and says, "You're not supposed to be here until the Yankees win the pennant again," and returns him to the world of the living. October 1996 came and went. Nothing. (Okay, in fairness, he thought it would take 100 years, but come on, not even a throwaway BrickJoke?) In the DVD commentary, someone says "Well, ''that'' didn't happen," and that's all anyone involved with the episode has ever said about it.
235** Remember Bart's ''Franchise/StarTrek'' belt from the episode "The Homer They Fall"? Neither does he. The DVD commentary does make mention of how they pretty much abandoned the "Bart gets his ''Franchise/StarTrek'' belt stolen" storyline for the "Homer becomes a boxer" storyline (which they also pointed out was a rehash of "Homerpalooza," only instead of Homer taking hits to the gut without feeling pain, it was hits to the head).
236** The first act of "Lisa The Greek" has a subplot about Bart going clothes shopping with Marge, getting embarassing clothes and ends with him in the car with the bullies outside waiting to kick his ass. It's never brought up again after that.
237** This trope was essentially why "Mother Simpson" was produced, as the then current writing team couldn't believe that Homer's mother had [[MissingMom never been seen]] outside of a couple flashback cameos.
238** At the end of "Two Bad Neighbors" former President Gerald Ford becomes Homer's new neighbor and they discover that they have a lot in common. Other than a picture of them together that Homer shows [[CosmicPlaything Frank Grimes]], he is never seen again afterwards.
239** In "Lisa the Tree Hugger", Bart wants to buy a game console and takes up a part-time job at a Thai restaurant. After a montage of Bart leaving fliers at peoples' doors, the restaurant is mentioned twice more. It's still never explained if Bart ended up buying the console or why he left a job he seemed to enjoy.
240** In "Mr. Spritz Goes to Washington", the Simpsons are kept awake due to a re-routing of an airway causing airplanes to fly right next to their house. We don't see how the others on the street react to this, despite it being a big problem for the Simpsons.
241** In "Fat Man and Little Boy", Homer tries to help Lisa win the science fair, against Martin. He does so by turning her model nuclear reactor into a ''working'' one. However, after this, the nuclear reactor is disposed of at the dump and it's never explained who ended up winning the science fair, or what Lisa brought after her project was thrown out.
242** In "Sleeping with the Enemy", Marge takes Nelson to the dentist (due to his neglectful mother, he has no idea "doctors for your teeth" even exist). Neither the visit nor the results are shown or discussed.
243** "Thank God, It's Doomsday" has Homer predict the Rapture. While the Flanders family are much more religious than Homer and aware of the Rapture party, they aren't seen in Heaven after the apocalypse.
244** "Secrets of a Successful Marriage" is about Homer leading a class at the adult education center, solving marriage-related problems from various citizens of Springfield. Once he starts sharing secrets about Marge and gets kicked out of the house, it's never shown what happened to his class.
245** "Whiskey Business" concludes Lisa's plotline with people from the company that created the Bleeding Gums Murphy hologram harassing Lisa with holograms of various celebrities (including jazz legend Sonny Rollins AsHimself), and then... her plotline abruptly stops with no resolution.
246** "Bart the Genius" has Bart cheat on an aptitude test by switching his own paper with Martin's. After the test-taking scene, Martin is not mentioned again in the episode and it's not known if he received a visit from Dr. J. Loren Pryor about the (presumably very low) score he received.
247* ''WesternAnimation/SkullIsland2023'': The [[Characters/MonsterVerseSkullIslandExpedition bespectacled mercenary]] is grabbed and carried away by the giant [[KidnappingBirdOfPrey hawk]], and we never see him again. [[spoiler:We don't see hide nor hair of him at Kong's temple when it's revealed that the hawk wasn't eating the catches it caught but was instead bringing them alive to Kong's home, so it's unknown what happened to him]].
248* ''WesternAnimation/SonicTheHedgehogSatAM'':
249** The first season had at least one episode where Sally is searching for her father. In the second season, she finds him, but no attempt was made to connect it with the clues found in her previous searches.
250** In another second season episode, they alter the past to ensure that their nanny survives to the present day, and it's revealed at the end of the episode that she does -- and is never seen again.
251* ''WesternAnimation/SouthPark'':
252** The episode "Coon vs. Coon and Friends" was really bad about this. The two previous episodes featured Tony Hayward and Captain Hindsight playing significant roles, but they don't appear in the finale or are even mentioned. (Hindsight removed his superpowers, but his last scene implied he regretted the decision; ending his arc there feels like a ShaggyDogStory.) There were also interdimensional beings besides Cthulhu who appeared in the first episode but were simply forgotten.
253** Tweek becomes the "new Kenny" (translation: fourth main character) for the second part of Season 6. At the start of the third part however, the Boys were inexplicably back to three. Somewhat justified since Cartman said they were thinking about firing him in his last episode as "the new Kenny," but there was a whole episode devoted to firing Butters, who continued to be a main character while Tweek was DemotedToExtra.
254** "The Poor Kid" begins with Kenny and his rarely-seen siblings, Kevin and Karen, being taken into foster care. We follow Kenny and Karen throughout the rest of the episode, but Kevin disappears -- they don't even throw in a line about him going to a different family or anything.
255** The episode "The Snuke" is a parody of ''Series/TwentyFour,'' with part of the plot involving Hilary Clinton having a nuke implanted in her body. While the other characters manage to stop the terrorists who planned to detonate it, the plotline of her having it removed doesn't get resolved. This may be intentional, given how much ''24'' used this trope themselves.
256** At the end of "201" we never found out how they got rid of Mecha-Streisand. The Super Best Friends distract her with a Neil Diamond duet and that's the last we see of her.
257** Token gets shot by accident ([[PoliceBrutality ?]]) and taken away in "The Pandemic Special", but is never seen or mentioned again after that, his fate left unknown. The "[[Recap/SouthParQVaccinationSpecial Vaccination Special]]" reveals that he survived.
258** The "Post-COVID" two-parter shows a possible future, which includes Wendy having married a guy named Darwin. He hangs around for the first special, having one moment as a LogicalLatecomer but otherwise not contributing much to Wendy's group. In the second part, however, he disappears after their first scene. [[spoiler:In the revised timeline, Wendy is apparently single and has a MaybeEverAfter with Stan]].
259* ''WesternAnimation/SpongeBobSquarePants''
260** In "Grandma's Kisses", [=SpongeBob=]'s grandmother puts Patrick to sleep on her couch. When the couch is next shown, Patrick is gone.
261** In "I'm With Stupid" when [=SpongeBob=] runs out of Patrick's house after failing to convince his parents he's not really stupid, he's not seen again for the rest of the episode.
262** "Mermaid Man and Barnacle Boy IV":
263*** The entire premise is that [=SpongeBob=] accidentally shrinks everyone with Mermaid Man's belt. At the end when he shrinks the town (and himself) the belt is nowhere to be seen.
264*** After [=SpongeBob=] has shrunken everyone in Bikini Bottom, Patrick strangely disappears for the rest of the episode.
265** In "Stanley S. [=SquarePants=]", Squidward is introduced to [=SpongeBob's=] cousin Stanley and is so freaked out that he [[ScrewThisImOuttaHere moves out in a haste.]] Following this, he is not seen again for the rest of the episode, even during the Krusty Krab scenes where Stanley somehow takes his place.
266** At one point in "Mr. Krabs Takes a Vacation", [[PottyEmergency [=SpongeBob=] is desperate to use the bathroom.]] When he, Mr. Krabs, and Pearl arrive at the mint, it's never brought up again.
267** In "Chatterbox Gary" when Squidward secretly switches Gary's chatterbox translation collar with a knockoff while [=SpongeBob=] is still asleep, the collar is not seen again for the rest of the episode with its fate unknown.
268** In "Fear of a Krabby Patty", we never find out what became of the 10,000 Krabby Patties.
269** In "A Pal For Gary", we never find out what happens to Puffy Fluffy after being sent away, nor do we find out if he turned back to his cute state. We also don't find out what happened to the little boy who also bought one of Puffy Fluffy's species. Did ''he'' suffer the vicious consequences, too?
270** In "Patty Hype", Squidward and Krabs make fun of [=SpongeBob=] for inventing Pretty Patties. While Krabs gets his comeuppance, we don't see Squidward after this initial scene.
271** In "Someone's in the Kitchen with Sandy", we see Sandy hiding in the sewers, saying "If I'm ever going to catch this thug, I'm going to need some help!" The next time we see her, she's crawling into the Krusty Krab through a hole in the floor. What "help" did she get? The cops show up later, but it's unclear if Sandy intentionally called them or they just happened to be there.
272** After [=SpongeBob=] shows up to talk about the grease in "There Will Be Grease", Karen, the Krusty Krab, and the Chum Bucket aren't mentioned again. Even though the episode involves Krabs and Plankton's partnership, finding a miracle recipe that fixes everything, and both of them coming into a lot of money, which you'd expect would be relevant to their restaurants in some way.
273** "Squid Baby": [=SpongeBob=] and Patrick come into the Krusty Krab zonked out after 72 straight hours of pampering the baby-morphed Squidward; after Patrick falls asleep on one of the tables, he is gone for the rest of the episode.
274** "It Came from Goo Lagoon": Despite Squidward being one of the people who uses the Super Goo, he completely disappears midway through the episode. Even at the Krusty Krab scene at the end, he isn't there.
275** In "Kenny the Cat", both [=SpongeBob=] and Patrick are excited for Kenny's arrival. However, Patrick gets creeped out by [=SpongeBob=]'s Kenny obsession and leaves. We don't see him again after that.
276** "The Night Patty": Patrick just disappears from the episode after [=SpongeBob=] fills in for the night shift fry cook, save for a brief cameo in the "Title Zone" epilogue.
277** In "Escape from Beneath Glove World", [=SpongeBob=] and Patrick are sent to Glove Jail with a bunch of kids. All the kids escape, but [=SpongeBob=] and Patrick go after just ''one'' toddler, with the rest of the kids not seen again with no explanation.
278** "There's a Sponge in My Soup": Patrick is shown to be living in the soup as a hippie. But he isn't seen afterwards even after the hippies go to live somewhere else.
279** "Spot Returns": The people who originally adopted the amoeba puppies are never seen again. We don't even find out Mrs. Puff's reaction to returning home and finding her living room destroyed.
280** "The Pink Purloiner": Mr. Krabs vows to find [=SpongeBob=]'s net, but completely vanishes from the episode afterwards.
281** "[=SpongeBob=] You're Fired": [=SpongeBob=] is able to make homemade snail food for Gary (and apparently really good snail food at that) without accidentally making a Krabby Patty, but this is never brought up again afterwards.
282** "Unreal Estate": The pepper Squidward used to trick [=SpongeBob=] into thinking he was allergic to his house was never brought up again after he moves out.
283** In "Big Sister Sam", Squidward and Sam's conflict is a focus point of the episode. Once Sam throws Squidward out of his bulldozer, he doesn't appear for the rest of the episode.
284** At the beginning of "The Two Faces of Squidward", [=SpongeBob=] and Patrick are making jokes about Squidward in the kitchen; after [=SpongeBob=] comes out and [[TheDoorSlamsYou injures Squidward's face with the door]], Patrick is gone for the rest of the episode.
285** In "Sandy, Help Us!", we never figure out if the Flying Dutchman got back to normal size, since he's still tiny when Sandy leaves him and he doesn't appear afterwards.
286* ''WesternAnimation/StarTrekLowerDecks'': In "[[Recap/StarTrekLowerDecksS1E08Veritas Veritas]]":
287** In-universe, Clar insists on more information about details that the lower deckers didn't focus on, such as the map of the Neutral Zone or the package from Tendi's secret mission.
288** Out of universe, we never do learn how Rutherford got to the Gorn wedding, or how he managed to escape.
289** We never find out what happened to the actual "cleaner" that was supposed to join Ransom's infiltration team, and whose place Tendi inadvertently took.
290* ''WesternAnimation/StarVsTheForcesOfEvil'': The Season 1 episode "[[Recap/StarVsTheForcesOfEvilS1E5MonsterArm Monster Arm]]" ends with the titular demonic arm, as it transforms back into a normal limb, telling Marco that WeWillMeetAgain, as it's permanently a part of him now. Star assures him that the threat is ''probably'' nothing to worry about, followed by close-up of Marco's worried face and a lingering shot on his broken arm before the cut to black. While the arm is at least mentioned briefly in Season 3 as part of a quick joke, it fails to make a return appearance for the remainder of the series. WordOfGod states that they attempted to return to this plot point several times, but could never come up with a good enough story.
291* ''WesternAnimation/StarWarsTheCloneWars'':
292** The [[Recap/StarWarsTheCloneWarsS2E18TheZilloBeast Zillo]] [[Recap/StarWarsTheCloneWarsS2E19TheZilloBeastStrikesBack Beast]]. At the end of the two-parter in which it appears and is killed, [[BigBad Palpatine]] gives scientist Dr. Boll a datapad with orders to clone the Beast. The Season 2 DVD commentary stated that the creators were thinking of following up on this in Season 7 or thereabouts, but the show was cancelled before it could get that far. It was revealed that the planned story where Ahsoka teamed up with Anakin and Obi-Wan to investigate a Sith temple far under the Jedi Temple on Coruscant would have involved the Zillo Beast, or possibly its clone, fighting monsters. However, since ''[[Literature/StarWarsTarkin Tarkin]]'' confirms that Darth Vader doesn't know about the existence of the buried Sith shrine, this arc, if it ever did happen in canon, could not have occurred the way it was initially planned.
293** Separatist leaders Wat Tambor and Poggle the Lesser were last seen in Republic custody, despite the fact that they were free in ''Film/RevengeOfTheSith''. Poggle's case was answered in the novel ''[[Literature/StarWarsCatalyst Catalyst]]'', while Tambor appears in [[Recap/StarWarsTheCloneWarsS7E2ADistantEcho "A Distant Echo"]] out of Republic custody without explanation. WordOfGod was that [[BigBad Palpatine]] had Tambor transferred to a prison where the Separatists could break him out.
294** The number of these rises greatly when you start thinking of the clones themselves who are named and given characterization but never appear or are mentioned ever again after that episode, or are even regular characters who aren’t shown dying at any point but don’t appear in the movies. A brief list includes Blitz, Stone, Boil, Boost, Sinker, Jek, Rys, Broadside, Hawk, Jet, and Doom.
295* As a result of the first five seasons being made before Disney rebooted the ExpandedUniverse, but kept the show itself as a part of its rebooted canon, several character arcs and resolutions were either booted out of the canon, while others were only wrapped up in the new canon.The most significant example of this is Ashoka Tahno; Since her story-post leaving the Jedi Order- is exclusive to the rebooted continuity, ''Legends'' Ashoka's life after leaving the order remains unadressed.
296* ''WesternAnimation/StarWarsRebels'' itself has a few unresolved plot points:
297** [[Recap/StarWarsRebelsS1E01DroidsInDistress "Droids in Distress"]]: Crime boss Vizago makes off with half the shipment of [[DisintegratorRay disruptors]] the ''Ghost'' crew stole. This was never followed up on for the rest of the show.
298** [[Recap/StarWarsRebelsS2E17TheForgottenDroid "The Forgotten Droid"]]: The {{jerkass}} captain of the Imperial freighter Chopper and AP-5 steal is last seen being knocked out by Chopper on the ship. What happened to the freighter itself, as well as the captain, is unknown, although it's possible that he may be in rebel custody.
299** [[Recap/StarWarsRebelsS3E06IronSquadron "Iron Squadron"]] introduces the eponymous group of [[NaiveNewcomer naïve newcomers]], three teenagers and their astromech droid. The group was led by [[CommandingCoolness Commander Sato's]] nephew, his only living relative, and they were [[TheScrappy unpopular]]. They joined Phoenix Squadron at the end of the episode, and aren't seen or mentioned for the rest of Season 3, which becomes ''especially'' jarring when [[spoiler:Sato ''[[HeroicSacrifice died]]'']] in the Season 3 finale.
300*** Mart Mattin, the Iron Squadron's leader, returned in Season 4 to play a supporting role. His astromech, R3-A3, came BackForTheDead. However, what he was doing during the Battle of Atollon is never brought up, and the other two members, Gooti and Jonner, did not return.
301** [[Recap/StarWarsRebelsS3E09VisionsAndVoices "Visions and Voices"]]: [[spoiler:Maul]] tracks Kanan and Ezra back to Atollon, the site of the rebels' base, and avoids being killed by stating he's placed a beacon with a DeadMansSwitch somewhere on the planet to alert the Empire if he's killed or injured. This beacon is never brought up for the rest of the season, not even to say it had been removed. [[spoiler: It's rendered irrelevant at the end of the season when the Empire finds them by other means.]]
302* ''WesternAnimation/StaticShock'' had SmallRoleBigImpact character [[ScaryBlackMan Wade]], who was responsible for Virgil getting his powers. He was a friendly GangBanger who went out of his way to protect Virgil from TheBully [[PlayingWithFire Hotstreak]], and [[JerkWithAHeartOfGold pressured him into joining his gang for protection]]. After dragging Virgil to what would become [[MassSuperEmpoweringEvent the Big Bang]], he's never seen again. In the comics, it was explicitly stated that more people died from the effects of the gas than were mutated so it's likely that [[UncertainDoom he was one of the unlucky ones]].
303* ''WesternAnimation/StevenUniverse'': "[[Recap/StevenUniverseS4E6LastOneOutOfBeachCity Last One Out of Beach City]]" has Pearl try out being wild and spontaneous for a night, going with Steven and Amethyst to a concert. She meets a human woman who looks like Rose, and manages to get her phone number (the episode only gives her first initial "S", but WordOfGod says they were calling her [[Music/TheRamones Sheena]] behind the scenes). It seemed like the two were going to hit it off and the Crewniverse even confirmed the Mystery Woman would return, but other than a background cameo in season 5, she was never seen again.
304* ''WesternAnimation/StevenUniverseFuture''
305** "[[Recap/StevenUniverseFutureS1E5Bluebird Bluebird]]" introduces us to the titular Bluebird Azurite, a fusion between the two villainous Gems Aquamarine and Eyeball Ruby from the original series. They initially arrive at Steven's house under the guise of wanting to learn the ways of Era 3, with Steven being [[{{TheSkeptic}} suspicious]] of their true motives. They eventually win him over, only to show their true colors when they take Greg hostage. A fight ensues, ending when the Crystal Gems arrive and squash them as Alexandrite. Aquamarine and Eyeball then fly off into the sky saying they'll always be out there hating Steven... Cue them never appearing in the series again. This is likely because the Crewniverse only had 20 episodes greenlit for Future, which led them to leaving out several story ideas, Bluebirds return potentially among them.
306-->'''Aquamarine:''' ''"You may have gotten us this time, but we'll be out there!"''
307-->'''Eyeball:''' ''"Hating you!"''
308-->'''Aquamarine:''' ''"Forever!"''
309-->'''Eyeball:''' ''"You smeeeeeell"-*flies off into the distance*.''
310* In the first of the 2003 ''WesternAnimation/StrawberryShortcake'' DirectToVideo specials, Strawberry's pet Pupcake accidentally bumps into an arrow sign, [[RoadSignReversal making it point the other way]]. Although Strawberry sees this, she doesn't bother to fix the sign, which indicates that it should be a plot point later on. Yet the sign is never seen or mentioned again.
311* ''WesternAnimation/StreetFighter'' had plenty. To quote the annotation near the end of [[https://www.youtube.com/watch?v=9qjuBlzEnuo this video]]: "What will Cammy do next? Can Ryu and Ken stop Akuma from murdering fighters and stealing their chi? Can T. Hawk set aside his feelings to stop Satin Hammer's terrorist vendetta against those who wronged her? Will Warrior's World ever be saved and will Chun Li ever reunite with her lover? Can Fei Long end the Triad's grip on Hong Kong and rebuild his tarnished career? Will Guile ever regain his old life and will Blanka regain his humanity? And what happened to Vega and Balrog?"
312* ''WesternAnimation/TeenTitans'':
313** Kitten disappears after her encounter with Starfire in "Calling All Titans", despite the fact that Killer Moth and Fang both appear in the ClimacticBattleResurrection. Kitten does just seem to be your average SpoiledBrat, having a half-moth father and a boyfriend whose head was a giant spider aside; she probably doesn't have any real combat training.
314** In "Titans Together," See-More isn't with the Hive Five when [[spoiler:Jinx]] defeats them. (Which may have been to avoid a DownerEnding, since there was an implication that they were fairly close.)
315** And then there's Red X who was originally [[spoiler:Robin in disguise]], only for the costume to be stolen by an unknown thief. After his final appearance being in "Revved Up" he is never seen again (not even during the final battle in "Titans Together"). We never find out who he was behind the mask or how he got the Red X costume, although Raven comments that it [[SecretIdentityApathy ultimately doesn't matter]] since he's a StrangerBehindTheMask.
316* In the 1987 ''WesternAnimation/TeenageMutantNinjaTurtles1987'' miniseries, Shredder mutates more punks after Bebop and Rocksteady lose their first fight against the Turtles. Then for some reason he doesn't do anything with them, and the viewers next see them in a jail cell in the Technodrome's portal room. You never learn what happens to them when the Technodrome is sucked through the reversed portal.
317** Bebop and Rocksteady also count. Their last appearance is in the Season 8 episode "Turtle Trek". After the Turtles destroyed the Technodrome's engines it was stuck in Dimension X for good. After the [[PutOnABus Shredder and Krang]] were retired as villains so the Turtles would start to fight Lord Dregg, Shredder and Krang do return in Season 10 (which was the final season) but Bebop and Rocksteady are not referred to again, with their fate being ambiguous.
318* ''WesternAnimation/TeenageMutantNinjaTurtles2003'':
319** The Rat King made his appearance in the fourth season, battling to a standstill with Leonardo. After the episode was over, it was made clear that the Rat King had survived and that there was a strong possibility of him showing up again in the future. Three seasons later ("The Lost Season", "Fast Forward", and "Back to the Sewers"), the Rat King still hasn't made any appearances and is never mentioned again. For better or worse, the Rat King subplot is more or less dropped after his Season 4 episode. A better title would be "What Happened to the Rat?" in this case.
320** What happened to the Rat King is answered in the "Back to the Sewer" season finale. Towards the end of the episode, he makes a cameo appearance, watching April and Casey's wedding from afar... The Rat King had promised himself that he would be watching the Turtles (presumably waiting for a good chance to strike). He was watching the Turtles when he was at the wedding. He probably had been watching them for a long time from off-screen.
321* In the Teenage Mutant Ninja Turtles special ''WesternAnimation/TurtlesForever'', the 1987 version of April O'Neil was kidnapped by a giant mutant banana (don't ask) and no one knows what happens to her. Knowing 1987 April, the Turtles rescued her off-screen. That's what happens every episode, after all.
322* The original ''WesternAnimation/TheTransformers'' wasn't immune either. The last we see of the Decepticons' human collaborator [[MadScientist Dr. Arkeville]] is him telling Starscream that the 'Con has to go back to Earth (from Cybertron) personally. Afterwards, Arkeville is never seen again.
323* In the ''WesternAnimation/TransformersAnimated'' two-part episode "Megatron Rising", [[spoiler:the Dinobots appear in the first part, obviously hinting at an appearance in the second. Though the second part's main battle takes place on Dinobot Island, they are nowhere to be seen.]] This was explained in an interview with the story editor-originally [[spoiler:they were going to be beaten rather easily by the newly resurrected Megatron.]] However, the animation of the scene was terrible. That, and they were afraid the fans would be upset (especially since it violated the character profile saying [[spoiler:Grimlock was supposed to be as strong as Megatron]].
324** By the GrandFinale, there are still several loose threads hanging, including [[spoiler:where were Blackarachnia and Waspinator at the end of "Predacons Rising", did Ultra Magnus recover from Shockwave's attack, where did the protoform Sari used to be come from]], as well as what happened to several characters who were simply absent in the end.
325*** For example: [[spoiler:Given the manner in which Starscream finally dies, a bit of info on the fates of Wreck-Gar, the Constructicons, and [[OppositeSexClone Slipstream]] would have been nice. Not to mention Soundwave. And Team Chaar. And Skywarp and Thundercracker.]] Yeah, ''Animated'' has a lot of this. But that's what you get when a show is canceled.
326*** Thankfully, a few things do get [[AllThereInTheManual explained in the two 'AllSpark Almanacs']], such as [[spoiler:the fact that Ultra Magnus was going to go offline]] in Season 4, and that there was originally a scene cut from "Endgame", showing [[spoiler:Slipstream bringing Starscream back online (somehow)]].
327*** Being that it was a MerchandiseDriven show, and the 2009 movie sequel coming, the series was canceled on account of ending the WesternAnimation/TransformersAnimated toyline so it wouldn't start competing with the Film/TransformersRevengeOfTheFallen toyline.
328* ''WesternAnimation/TransformersPrime'' ends with the DTV movie ''Predacons Rising'', resolving all but one major plot line: the final fate of the villainess Airachnid, who was last seen going vampire on a horde of Insecticons after they were all trapped on one of Cybertron's moons. This is especially jarring when the entire movie takes place ''on Cybertron'', without a single break back to Earth.
329** Speaking of Earth, after having elected to stay there in the final episode to help the US Military with ultra-major threats, Ratchet returns to Cybertron, but we never learn if he goes back to Earth, or what the human companions may have been up to in the meantime, let alone how they'd react to [[spoiler:Optimus' HeroicSacrifice.]]
330** Shockwave is seen being attacked by a horde of [[spoiler: zombie Predacons]] and is assumed to be dead. However he appears later, damaged but alive, to urge the Predacons to help the Autobots stop [[spoiler: Unicron]]. He doesn't appear in the final battle and disappears for the rest of the movie.
331* ''WesternAnimation/TransformersRobotsInDisguise2015'' has some examples stemming from the fact that it's a sequel to Transformers Prime.
332** With [[spoiler: Ratchet's]] return in Decepticon Island Season 2 finale and [[spoiler: Bulkhead's]] return in Sick as a Bot, it was originally unknown what happened to the rest of Team Prime. [[spoiler: Enemy of My Enemy makes mention that every Autobot has been blacklisted by the High Council, who turned out to be Decepticons in disguise.]]
333** Perhaps the most glaring one is Knockout, who pulled a [[spoiler: HeelFaceTurn at the end of Predacons Rising.]]
334** Another example is the BigBad Megatron. Several Decepticons are implied either not to have been aware that [[spoiler: Megatron [[HeelFaceTurn disbanded the Decepticon faction]] and is now in exile, or they refuse to accept his decision]]. Soundwave also attempted to contact Megatron in Collateral Damage but failed. This leaves Megatron not appearing anywhere in the show.
335** Outside of Transformers Prime, [[Westernanimation/TransformersRescueBots Blurr]] is the only Autobot that previously appeared in the show that does not appear in the two-part finale.
336* ''WesternAnimation/WinxClub''
337** Stella is the fairy of the Sun and the Moon, but all her powers focus on the sun (except a few in the fourth season, but these focus more on stars). Nickelodeon seems to have tried to amend this by calling Stella the fairy of the shining sun.
338** Sky had a dog but, aside from a brief flashback in Season 2, it has never been seen again after Season 1.
339** And where did Hagen go after the ''[[TheMovie The Secret of the Lost Kingdom]]''? The way he and Faragonda acted indicated that she wouldn't let him go into isolation again, but he never even gets mentioned after the Movie.
340** As of Season 5, the Pixie Pets aren't seen or even mentioned anymore, though this was bound to happen given that their impact on the plot during Season 4 was nonexistent, and they weren't particularly popular even with the target audience.
341** The pixies weren't seen or mentioned even once in Season 5. They returned in Season 6, but Digit and Tune were replaced with Cherie and Caramel with no explanation provided.
342** The Witches. The first season heavily implied witches were the evil counterpart towards the fairies. Towards the end of the season, the witches turn out be...not exactly evil...with no explanation as to exactly what sets them apart from fairies anyway. In general, the witches except the Trix slowly got phased out of the show.
343** In the Season 4 finale of [[spoiler:Aisha decides to take the flower that was revived with the gift of life back to Andros as a memento of Nabu. What Aisha did with the flower or anything else she did on Andros has been left unkown.]]
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