History SequelEpisode / WesternAnimation

* ''WesternAnimation/StevenUniverse'' is normally a continuity-heavy series where things that change in one episode are regularly called back to in another, and some episodes' plots are directly derived from earlier ones:
** [[Recap/StevenUniverseS1E10StevensLion "Steven's Lion"]], [[Recap/StevenUniverseS1E17Lion2TheMovie "Lion 2: The Movie"]], and [[Recap/StevenUniverseS1E35Lion3StraightToVideo "Lion 3: Straight to Video"]] [[SubvertedTrope don't actually have much to do with each other]] as far as their individual plots are concerned, aside from Lion having a major role in each. "Lion 2" and "Lion 3" receive an ''actual'' follow-up in [[Recap/StevenUniverseS1E45RosesScabbard "Rose's Scabbard"]], which revisits certain elements of the previous episodes (in particular, Rose's armory and her CoolSword). [[Recap/StevenUniverseS4E20Lion4AlternateEnding "Lion 4: Alternate Ending"]] follows up on "Lion 3" in a different way, as Steven reassesses the message from his mother to find some hidden purpose.
** [[Recap/StevenUniverseS1E27HouseGuest "House Guest"]], the first episode of the first season's second half, deals with one of the immediate consequences of [[Recap/StevenUniverseS1E25MirrorGem "Mirror Gem"]]/[[Recap/StevenUniverseS1E26OceanGem "Ocean Gem"]], the half-season finale (Greg's broken leg, an injury he suffered in "Ocean Gem").
** [[Recap/StevenUniverseS2E2OpenBook "Open Book"]] is one to [[Recap/StevenUniverseS1E19RosesRoom "Rose's Room"]]. Both are set in the eponymous room, and both have a similar plot where Steven has to deal with the room's strange effects.
** [[Recap/StevenUniverseS1E38TheTest "The Test"]] kicks off when Steven discovers that the Sea Spire mission from [[Recap/StevenUniverseS1E3CheeseburgerBackpack "Cheeseburger Backpack"]] was a test, which he thinks he failed.
** The first episode of season 2, [[Recap/StevenUniverseS2E1FullDisclosure "Full Disclosure"]], picks up directly from the ending of the season 1 finale, [[Recap/StevenUniverseS1E48TheReturn "The Return"]]/[[Recap/StevenUniverseS1E49JailBreak "Jail Break"]], as Steven tries to cope in the aftermath of the latter.
** [[Recap/StevenUniverseS2E12WeNeedToTalk "We Need to Talk"]] is a direct follow-up to [[Recap/StevenUniverseS2E5StoryForSteven "Story for Steven"]], both [[WholeEpisodeFlashback Whole-Episode Flashbacks]] centered on Greg and Rose. [[Recap/StevenUniverseS3E16GregTheBabysitter "Greg the Babysitter"]] is a third set later still, though the focus is a bit more on Greg specifically.
** [[Recap/StevenUniverseS1E20CoachSteven "Coach Steven"]] centers on Garnet and Amethyst fusing, inspiring anxiety (and a song) from Pearl until their fusion goes out of control and Pearl has to stop her. [[Recap/StevenUniverseS2E14CryForHelp "Cry for Help"]] starts with Garnet deciding to fuse with Pearl instead of Amethyst for a similar task, causing Amethyst to experience similar feelings (and also a song), [[spoiler:but their fusion goes wrong [[AddictiveMagic in a different way]]]].
** [[Recap/StevenUniverseS3E1SuperWatermelonIsland "Super Watermelon Island"]] is not only a sequel to [[Recap/StevenUniverseS1E34WatermelonSteven "Watermelon Steven"]], it is also part of the resolution of two separate {{Story Arc}}s ([[spoiler:Malachite and the Cluster/Peridot's redemption]]). [[Recap/StevenUniverseS5E27Escapism "Escapism"]] returns to the Watermelon Stevens' island, but it's more of a backdrop as Steven is there for incidental reasons.
** The plot of [[Recap/StevenUniverseS3E11BeachCityDrift "Beach City Drift"]] is kicked off when Kevin, the guy who harassed Steven and Connie in [[Recap/StevenUniverseS1E37AloneTogether "Alone Together"]], reappears, causing them to try to get back at him. In [[Recap/StevenUniverseS5E10KevinParty "Kevin Party"]], he comes back again and invites them to a party, which they use as an opportunity to reconnect when they'd spent the last few episodes not speaking to each other.
** [[Recap/StevenUniverseS1E23MonsterBuddies "Monster Buddies"]] ends with Steven hoping he'll find some way to help a Gem monster he befriended. [[Recap/StevenUniverseS3E14MonsterReunion "Monster Reunion"]] begins with Steven discovering that his healing powers still work, and he partially succeeds in using them for just such a task.
** In [[Recap/StevenUniverseS2E17HistoricalFriction "Historical Friction"]], the characters [[ShowWithinAShow put on a play]] about the founding of Beach City. [[Recap/StevenUniverseS4E3BuddysBook "Buddy's Book"]] picks up where the play's story left off. However, it stars the play's {{Deuteragonist}}, which makes it more of a SpinOff Sequel Episode.
** [[Recap/StevenUniverseS1E9TigerMillionaire "Tiger Millionaire"]] is a ProWrestlingEpisode where Steven discovers Amethyst wrestles as PercussiveTherapy, and joins her to have fun together. Several seasons later, [[Recap/StevenUniverseS4E18TigerPhilanthropist "Tiger Philanthropist"]] shows they were still wrestling, but Amethyst quits suddenly because she feels better about herself, leaving Steven uncertain whether to keep at it or how.
** In [[Recap/StevenUniverseS3E10TheNewLars "The New Lars"]], Steven possesses Lars' body. Everyone likes Lars more for this, and only Sadie gets suspicious, which makes Lars realize no one else really knows him. In [[Recap/StevenUniverseS4E22TheGoodLars "The Good Lars"]], Lars tries to use baking for a potluck as an opportunity to open up to other people.
** [[Recap/StevenUniverseS5E9SadieKiller "Sadie Killer"]] ends with Sadie joining Steven, Buck, Jenny, and Sour Cream's band [[spoiler:after quitting her job]]. [[Recap/StevenUniverseS5E14TheBigShow "The Big Show"]] is Steven's in-universe documentary of the band several months later as Greg gets them a gig in Empire City.

* ''WesternAnimation/GarfieldAndFriends'' had several episodes that served as continuations to previous episodes, both in the ''ComicStrip/{{Garfield}}'' segments and the ''ComicStrip/USAcres'' segments.
** "Double Oh Orson", which had Orson pretend that he's a secret agent, had Double Oh Orson return for more adventures in "Cornfinger" (where he tries to figure out who has stolen the missing corn) and "Sly Spy Guy" (where he imagines one more adventure due to having trouble finding his spy novel).
** "Robodie II" continues "Robodie" by having Dr. Garbanzo Bean return to continue trying to make robot dogs modeled after Odie.
** "Barn of Fear" was given a sequel episode in "Barn of Fear II", which had Orson's brothers again try to scare Orson and friends by pretending to be ghosts, only for their plan to be again thwarted by the ghosts of the farm animals' ancestors.
** "Hogcules II" was a continuation of "Hogcules" where Orson resumed pretending that he's a muscle-bound hero in Ancient Greece.
** "Binky Gets Cancelled Again", a continuation of "Binky Gets Cancelled" where Binky the Clown once again ends up out of work when the plug is pulled on his show and Garfield has to help Binky get his show renewed once more. It's notable for being the first appearance of the Buddy Bears, who would show up to cause problems for the cast with their TheComplainerIsAlwaysWrong ideals several more times.
** Garfield's girlfriend Penelope, introduced in "The Perils of Penelope", would return in a major role for the subsequent episodes "The Second Penelope Episode", "The Garfield Musical", "The Third Penelope Episode" and "The Guy of Her Dreams".
** "The Kitten and the Council" is a follow-up to "The Kitty Council", where the Kitty Council who put Garfield on trial for behavior they saw as unfitting for a cat return to put Nermal on trial for being too cute.
** "The Incredibly Stupid Swamp Monster", where a dim-witted robot created by a mad scientist named Dr. Karloffis Boar ended up covered in swamp sludge before encountering Orson and friends, was given a sequel in "Return of the Incredibly Stupid Swamp Monster", where Dr. Boar tried to reclaim his creation after it had befriended the U.S. Acres gang.
** "Another Ant Episode" had the singing ants from "The Picnic Panic" return to cause more trouble for Garfield, Jon and Odie.
** "The Fairy Dogmother" was given a follow-up in "Dogmother 2", which had Esmeralda return to grant wishes for Garfield, Jon and Odie.
** An interesting case is found with the ''Garfield'' segment "The Feline Philosopher", which had the story continue in the ''U.S. Acres'' segment "The Farmyard Feline Philosopher" and had the feline philosopher impart his wisdom to Orson and friends rather than Garfield.

* ''WesternAnimation/CodenameKidsNextDoor'' had plenty over it's run, they may have well been {{Story Arc}}s.
** "Operation C.A.K.E.D." (which were all named with a number at the end, save S.I.X.) dealt with the K.N.D confronting the Delightful Children for refusing to share their birthday cake and trying to either take it away from them, make sure other kids got a taste of it or both[[spoiler:, only failing in the the sixth one due to some clever manipulation by the Delightful Children]]. Likewise the final episode, Operation I.N.T.E.R.V.I.E.W.S, was centered around this.
** "Operation C.A.B.L.E.-T.V." led into "Operation G.R.O.W.-U.P."[[spoiler:, where the Delightful Children found the Age-Changing Cigar previously owned by Mr. B to turn the entire world into babies and used it to turn Numbuh One into an adult, then his teammates need to recover the cigar to get their old leader back]].
** "Operation: S.P.A.N.K." leads up to "Operation: L.O.C.K.D.O.W.N.", detailing how the kids tricked [[OurVampiresAreDifferent Count]] [[ComedicSpanking Spankulot]] into spanking an innocent child[[spoiler:, later, the judge who put him away,]] and sent him to a normal prison instead of theirs. Out of revenge, Count Spankulot spanked Numbuh One without his gloves to transform him into a Spank-Happy Vampire [[spoiler:after luring him into his cell with his hypnotic abilities, while the others wildly assumed he escaped from prison, at which point Numbuh One would do the same to his teammates and Numbuh Three's [[GirlsLoveStuffedAnimals Big Bottom Rainbow Monkey Doll]] after ordering a lockdown of the treehouse]].
** "Operation: S.U.P.P.O.R.T.", "Operation: K.I.S.S.", "Operation: S.P.A.C.E." and "Operation: E.N.D." centers on Numbuh Five's older sister, [[BigBrotherBully Cree]], [[spoiler:formerly Kids Next Door operative Numbuh 11, and now, a Teen Ninja siding with the evil adults,]] trying to destroy the Kids Next Door Moonbase by making it [[HurlItIntoTheSun collide with the sun]]. [[spoiler:Chad/Numbuh 274 already tried Cree's plan after Numbuh One found out his 13th Birthday was approaching and he tried to avoid being decommissioned at all costs, such as making sure those invited to his party, including the Sector V team, didn't learn the truth by raising their ages and getting them wrongly decommissioned. However, this plan fails. He tells Cree he failed when she finally arrives in the garbage pod Numbuh Five previously launched her out of, at which point he joins her.]]
--->[[spoiler:'''Cree:''' (''arriving at the Moonbase in the trash chute she piloted, which was previously launched out of a KND spacecraft in an earlier episode by Numbuh Five'') Crud! Time for Plan "B".\\
'''Chad:''' Think you could use some help?\\
'''Cree:''' Sure, kid, come on.\\
'''Chad:''' I'm not a kid! I'm a teenager! (''hops into the trash chute with Cree and escapes the Moonbase'')]]
** "Operation: B.E.A.C.H." and "Operation: K.A.S.T.L.E." detailed King Sandy's attempts to marry Numbuh Three, only to later fall in love with her younger sister, Mushi.
*** "Operation: C.L.U.E.S." and "Operation: S.P.A.N.K.E.N.S.T.I.N.E." served as the sequels for the King Sandy episodes, wherein as Mushi and Sandy's relationship had developed over time, it caused her to develop his disdain for Rainbow Monkeys. During a dinner party at the Gilligan Residence, Mushi is GroundedForever for "murdering" her sister's Posh Party Rainbow Monkey doll thanks to Numbuh Two's detective skills. Later, Mushi steals Count Spankulot's powers and brings the Rainbow Monkey back to life as a spank-happy monster as revenge, only for her grounding to be increased to five life sentences and later [[TheRunaway to run away from home]].
** "Operation: E.N.D", "Operation: T.R.A.I.N.I.N.G.", "Operation: S.L.U.M.B.E.R." and "Operation: G.R.A.D.U.A.T.E.S." focused on two topics: Numbuh 2's younger brother, Tommy, training to be a Kids Next Door operative and the theft and recovery of the Kids Next Door Code Module. The Code Module is needed to induct new Kids Next Door operatives by inserting samples of their DNA after graduation, [[spoiler:specifically, boogers,]] and [[BigBad Father]] needed it to power a machine that turns Kids Next Door operatives into animals. After Father failed to steal the Code Module himself at the Arctic Base while Tommy was in the middle of his training, it was later stolen by the Teen Ninjas[[spoiler:, plus, another traitorous Kids Next Door operative whose 13th birthday was approaching invited to Numbuh 86's slumber party]] at the Moonbase, until the Sector V team recovered it just in time for Tommy's graduation (especially with the computer game that served as the prequel to the episode). [[spoiler:Tommy had no choice but to resign from the Kids Next Door to avoid being hit by the device, then [[HoistByHisOwnPetard turned said device against Father and the Delightful Children]] by stealing their DNA and inserting them into the Code Module, allowing him to destroy said device afterwards, at which point he later became "The Tommy".]]
*** "Operation: I.T." serves as the sequel to "Operation: G.R.A.D.U.A.T.E.S."[[spoiler:, where Father and the Delightful Children from Down the Lane are still in the Kids Next Door database after Tommy stole their DNA to turn their animal transforming device from the earlier episode against them shortly after his resignation. They were still in the database in a game of tag and the winner would become the new KND Soopreme Leader with Numbuh 362 considering handing over the job to someone else. Father planned to infest every treehouse with broccoli until Numbuh 362 [[HoistByHisOwnPetard used it against him]], [[EnemyMine with a little help from the Delightful Children]], [[EvenEvilHasStandards because not even]] ''[[EvenEvilHasStandards they]]'' [[EvenEvilHasStandards like broccoli]]. After the fact, Father's and the Delightful Children's DNA are removed from the Code Module and Numbuh 362 retakes her role]].
** "Operation: J.E.W.E.L.S.", "Operation: R.A.B.B.I.T.", "Operation: C.H.O.C.O.L.A.T.E.", "Operation: L.I.C.O.R.I.C.E." and "Operation: C.A.R.A.M.E.L." detailed the story around Numbuh Five and her arch-rival, Heinrich Von Marzipan.
** "Operation: P.R.E.S.I.D.E.N.T." and "Operation: S.N.O.W.I.N.G." set up "Operation: E.L.E.C.T.I.O.N.S.", detailing the fiasco with the school president and the consequences that followed.
** "Operation: H.O.U.N.D." set up "Operation: D.O.G.H.O.U.S.E.", which involved [[ADogAteMyHomework homework-eating]] [[OurWerebeastsAreDifferent weredogs]].
** "Operation: M.A.U.R.I.C.E." lead into "Operation: T.R.E.A.T.Y.", regarding the existence of undercover Teen KND Operatives.

* ''WesternAnimation/{{Arthur}}'':
** In "Arthur Writes a Story", Arthur has to write a narrative for school. The story he chooses is of how he got his dog, Pal, which we see at the end of "Arthur's Pet Business."
** In "The Chips Are Down", D.W. and Binky, having eaten green potato chips, mistakenly believe that they're poisoned and are going to die. The two become friends over this incident, trying to do as much as they can before their deaths. Turns out the chips being poisoned was merely a rumor, which embarrasses D.W. in the following episode, "Revenge of the Chip".
** "Buster Baxter, Cat Saver" has a small B-plot of D.W. driving Arthur crazy with the "Crazy Bus" song. The episode it's paired with ("Play it Again, D.W.") has this as the main focus.
** "Buster's Back" sets up Buster's return back to Elwood City after his absence for a large chunk of the second season; "The Ballad of Buster Baxter" continues the plot by focusing more on what has happened since he's been gone.
** "Meet Binky" continues the plot surrounding the band that wrote graffiti all over the school from "Binky Rules."
** "Arthur's Baby" and "D.W.'s Baby" are the same story of Kate's birth, told from different points of view. Arthur's friends tell him how much work it'll be to have a baby around the house, while D.W. stays on top of things at first, but soon gets jealous of Kate's attention.
** In "D.W.'s Snow Mystery", D.W.'s prized snowball is stolen from the freezer, and she wants to know who did it. Cue a RashomonStyle plot where Arthur's friends and family all give their own accounts on what may have happened. "Return of the Snowball", six seasons later, has the snowball show up again in the freezer one night. D.W. goes through extensive measures to keep it safe, and hires Brain to analyze the likelihood of how it reappeared. In the end, Arthur confesses that he simply bought an unflavored snow cone and passed it off as the snowball so D.W. would shut up about it. The arc finally gets concluded in season 25 with "All Will Be Revealed!", where D.W.'s ImaginaryFriend, Nadine, reveals that she kept the snowball to prevent it from being stolen.
** Topics introduced in "Sue Ellen's Little Sister" are expanded upon in "Big Brother Binky" and "Wish You Were Here."
** In "Binky Goes Nuts," Binky is diagnosed with a peanut allergy and has to find a peanut-free Chinese restaurant in order to enjoy Chinese food again; in "Big Brother Binky," Binky and his parents visit the restaurant again after telling Binky that they're going to adopt a baby girl from China. At the end of the episode, the Barnes family visits the restaurant for a third time with new family member Mei-Lin.
** "Sue Ellen Gets Her Goose Cooked" is about Sue Ellen trying to cure her addiction to ''Virtual Goose''. In the paired episode, "Best of the Nest," everyone starts playing the game's new version.
** "The Blizzard" (season 4) features the town pooling their food and coming together to deal with a power outage. A radio broadcaster makes wildly inaccurate forecasts throughout. Much of this happens again during "The Blackout" (season 12), although with a heat wave, with Arthur's dad remembering how bad the forecasts were.

* ''WesternAnimation/AdventureTime'' has a lot of episodes that are continuations of others.
** "Return to the Nightosphere"/"Daddy's Little Monster" for "It Came From the Nightosphere", continuing the strained relationship between Marceline and her father.
** "Crystals Have Power" for "Tree Trunks", which resolved Tree Trunks' disappearance after taking a bite from the Crystal Gem Apple.
** "Too Young" for "Mortal Recoil", dealing with the aftermath of Princess Bubblegum being de-aged to 13 when she recovered from the Lich possessing her. "You Made Me" for "Too Young", which focuses on the conflict between Bubblegum and her creation Lemongrab, who showed up to rule the Candy Kingdom until Princess Bubblegum became an adult again. "All Your Fault" for "You Made Me", where we find out what's going on with Lemongrab and the clone Bubblegum made to keep him company.
** "Incendium" for "Too Young", which deals with Finn developing a crush on Flame Princess to cope with Princess Bubblegum not returning his affections. [[ThemeNaming Any episode with]] a fire-related {{pun}} as the title will feature Flame Princess, as "Hot to the Touch" and "Burning Low" both follow "Incendium".
** "The Vault" focuses on why the ghost girl from "The Creeps" appeared to Finn.
** "From Bad to Worse" has Cinnamon Bun become a PatientZero for the candy zombie virus previously seen in "Slumber Party Panic".
** "Beautopia" is a continuation of "Susan Strong" where Susan Strong returns to ask Finn and Jake for help in defending her people from the Lub Glubs.
** The ending of "Mortal Recoil" involved [[spoiler:the Lich possessing the Snail]]. "In Your Footsteps" ends with [[spoiler:the Bear taking the Enchiridion to the Lich so he can fulfill his goal of exterminating all life.]] "The Lich" and [[TwoPartEpisode "Finn the Human"/"Jake the Dog"]] follows up on that plot thread.
** "Lady and Peebles" revealed at the end that Lady was pregnant. "Jake the Dad" follows up on that with the plot of Jake moving in with her to take care of his and Lady's kids.
** "King Worm" resolves the plot thread of the previous episode "Evicted!" where the ending of said episode had Finn and Jake mesmerized by a giant worm.
** "I Remember You" elaborates on a reveal (that Ice King WasOnceAMan) introduced in "Holly Jolly Secrets". "Simon and Marcy" is one for "I Remember You", showcasing [[spoiler:Simon and Marceline's past together, which "I Remember You" only briefly elaborated on.]]
** "Too Old" ends with [[spoiler:Princess Bubblegum saving a Lemon Child named Lemonhope from [[AbusiveParent Lemongrab 1's]] clutches. [[TwoPartEpisode The "Lemonhope" two parter]] has her instructing Lemonhope to save his brothers from Lemongrab 1's tyrannical reign.]]
** "James" ended with the titular character sacrificing himself [[AndThenJohnWasAZombie and becoming an Ooze Zombie]]. "James II" has the James zombie show up to attack the Candy Kingdom.
%%** "The Pit" for "Play Date".
%%** "[[TwoPartEpisode "Wake Up"/"Escape from the Citadel"]] for "Billy's Bucket List"
%%** "The Tower" for [[TwoPartEpisode "Wake Up"/"Escape from the Citadel"]]
%%** "Breezy" for "The Tower"
%%** "Is That You" for [[TwoPartEpisode "Wake Up"/"Escape from the Citadel"]]

*** "Operation: I.T." serves as the sequel to "Operation: G.R.A.D.U.A.T.E.S."[[spoiler:, where Father and the Delightful Children from Down the Lane are still in the Kids Next Door database after Tommy stole their DNA to turn their animal transforming device from the earlier episode against them shortly after his resignation. They were still in the database in a game of tag and the winner would become the new KND Soopreme Leader with Numbuh 362 considering handing over the job to someone else. Father planned to infest every treehouse with broccoli until Numbuh 362 [[HoistByHisOwnPetard used it against him]], [[EnemyMine with a little help from the Delightful Children, because not even]] ''[[EnemyMine they]]'' [[EnemyMine like broccoli]]. After the fact, Father's and the Delightful Children's DNA are removed from the Code Module and Numbuh 362 retakes her role]].

** "Operation: E.N.D", "Operation: T.R.A.I.N.I.N.G.", "Operation: S.L.U.M.B.E.R." and "Operation: G.R.A.D.U.A.T.E.S." focused on two topics: Numbuh 2's younger brother, Tommy, training to be a Kids Next Door operative and the theft and recovery of the Kids Next Door Code Module. The Code Module is needed to induct new Kids Next Door operatives by inserting samples of their DNA after graduation, [[spoiler:specifically, boogers,]] and [[BigBad Father]] needed it to power a machine that turns Kids Next Door operatives into animals. After Father failed to steal the Code Module himself at the Arctic Base while Tommy was in the middle of his training, it was later stolen by the Teen Ninjas[[spoiler:, plus, another traitorous Kids Next Door operative invited to Numbuh 86's slumber party]] at the Moonbase, until the Sector V team recovered it just in time for Tommy's graduation (especially with the computer game that served as the prequel to the episode). [[spoiler:Tommy had no choice but to resign from the Kids Next Door to avoid being hit by the device, then [[HoistByHisOwnPetard turned said device against Father and the Delightful Children]] by stealing their DNA and inserting them into the Code Module, allowing him to destroy said device afterwards, at which point he later became "The Tommy".]]

** "Binky Gets Cancelled Again", a continuation of "Binky Gets Cancelled" where Binky the Clown once again ends up out of work when the plug is pulled on his show and Garfield has to help Binky get his show renewed once more.

** "From Bad to Worse" has Cinnamon Bun become a PatientZero for the candy zombie virus in "Slumber Party Panic", prompting Finn, Jake, LSP and Lady Rainicorn to quickly try and make a cure.

%%** [[TwoPartEpisode The "Lemonhope" two parter]] for "Too Old".
%%** "James II" for "James".

%%** "I Remember You" for "Holly Jolly Secrets," and even more directly, "Simon and Marcy" for "I Remember You."

%%** "The Creeps" for "Mystery Train", and "The Vault" for "The Creeps".
%%** "From Bad to Worse" for "Slumber Party Panic".

%%** "In Your Footsteps" for "Mortal Recoil".
%%** "The Lich" and [[TwoPartEpisode "Finn the Human"/"Jake the Dog"]] for "In Your Footsteps".
%%** "Jake the Dad" for "Lady and Peebles".

** "Operation: S.U.P.P.O.R.T.", "Operation: K.I.S.S.", "Operation: S.P.A.C.E." and "Operation: E.N.D." centers on Numbuh Five's older sister, [[BigBrotherBully Cree]], [[spoiler:formerly Kids Next Door operative Numbuh 11, and now, a Teen Ninja siding with the evil adults,]] trying to destroy the Kids Next Door Moonbase by making it [[HurlItIntoTheSun collide with the sun]]. [[spoiler:Chad/Numbuh 274 already tried Cree's plan after Numbuh One found out his 13th Birthday was approaching and he tried to avoid being decommissioned at all costs, such as making sure those invited to his party, including the Sector V team, didn't learn the truth by raising their ages and getting them wrongly decommissioned. This plan fails, telling Cree everything after she arrives in the garbage pod Numbuh Five previously launched her out of, at which point he joins her.]]

{{Sequel Episode}}s in western animation TV shows.

** "Operation: S.U.P.P.O.R.T.", "Operation: K.I.S.S.", "Operation: S.P.A.C.E." and "Operation: E.N.D." centers on Numbuh Five's older sister, [[BigBrotherBully Cree]], [[spoiler:formerly Kids Next Door operative Numbuh 11, and now, a Teen Ninja siding with the evil adults,]] trying to destroy the Kids Next Door Moonbase by making it collide with the sun. [[spoiler:Chad/Numbuh 274 already tried Cree's plan after Numbuh One found out his 13th Birthday was approaching and he tried to make sure those invited to his party, including the Sector V team, didn't learn the truth by raising their ages and getting them wrongly decommissioned, but it failed, telling Cree everything after she arrives in the garbage pod Numbuh Five previously launched her out of, at which point he joins her.]]

** "Operation C.A.K.E.D." (which were all named with a number at the end, save S.I.X.) dealt with the K.N.D confronting the Delightful Children for refusing to share their birthday cake and trying to take it away from them and making sure other kids got a tast of it[[spoiler:, only failing in the the sixth one due to some clever manipulation by the Delightful Children]]. Likewise the final episode, Operation I.N.T.E.R.V.I.E.W.S, was centered around this.

** "Operation C.A.K.E.D." (which were all named with a number at the end, save S.I.X) dealt with the K.N.D confronting the Delightful Children and trying to take their birthday cake away from them [[spoiler: Only failing in the the sixth one due to some clever manipulation by the Delightful Children.]] Likewise the final episode, Operation I.N.T.E.R.V.I.E.W.S, was centered around this.

* ''WesternAnimation/CodenameKidsNextDoor'': Had plenty over it's run they may have well been [[StoryArc Story Arcs]].

** "Operation: S.P.A.N.K." leads up to "Operation: L.O.C.K.D.O.W.N.", detailing how the kids tricked [[OurVampiresAreDifferent Count]] [[ComedicSpanking Spankulot]] into spanking an innocent child[[spoiler:, later, the judge who put him away,]] and sent him to a normal prison instead of theirs. Out of revenge, Count Spankulot spanked Numbuh One without his gloves to transform him into a Spank-Happy Vampire [[spoiler:after luring him into his cell with his hypnotic abilities, while the others wildly assumed he escaped from prison at which point Numbuh One would do the same to his teammates and Numbuh Three's [[GirlsLoveStuffedAnimals Big Bottom Rainbow Monkey Doll]] after ordering a lockdown of the treehouse]].

** "Operation: E.N.D", "Operation: T.R.A.I.N.I.N.G.", "Operation: S.L.U.M.B.E.R." and "Operation: G.R.A.D.U.A.T.E.S." focused on two topics: Numbuh 2's younger brother, Tommy, training to be a Kids Next Door operative and the theft and recovery of the Kids Next Door Code Module. The Code Module is needed to induct new Kids Next Door operatives by inserting samples of their DNA after graduation, [[spoiler:specifically, boogers,]] and [[BigBad Father]] needed it to power a machine that turns Kids Next Door operatives into animals; after failing to steal it himself at the Arctic Base while Tommy was in the middle of his training, it was later stolen by the Teen Ninjas[[spoiler:, plus, another traitorous Kids Next Door operative invited to Numbuh 86's slumber party]] at the Moonbase, until the Sector V team recovered it just in time for Tommy's graduation (especially with the computer game that served as the prequel to the episode). [[spoiler:Tommy had no choice but to resign from the Kids Next Door to avoid being hit by the device, then [[HoistByHisOwnPetard turned said device against Father and the Delightful Children]] by stealing their DNA and inserting them into the Code Module, allowing him to destroy said device afterwards, at which point he later became "The Tommy".]]

** "Operation: E.N.D", "Operation: T.R.A.I.N.I.N.G.", "Operation: S.L.U.M.B.E.R." and "Operation: G.R.A.D.U.A.T.E.S." focused on two topics: Numbuh 2's younger brother, Tommy, training to be a Kids Next Door operative and the theft and recovery of the Kids Next Door Code Module. The Code Module is needed to induct new Kids Next Door operatives by inserting samples of their DNA after graduation, [[spoiler:specifically, boogers,]] and [[BigBad Father]] needed it to power a machine that turns Kids Next Door operatives into animals; after failing to steal it himself at the Arctic Base while Tommy was in the middle of his training, it was later stolen by the Teen Ninjas[[spoiler:, plus, another traitorous Kids Next Door operative invited to Numbuh 86's slumber party]] at the Moonbase, until the Sector V team recovered it just in time for Tommy's graduation (especially with the computer game that served as the prequel to the episode). [[spoiler:Tommy had no choice but to resign from the Kids Next Door to avoid being hit by the device, then [[HoistByHisOwnPetard turned said device against Father and the Delightful Children]] by stealing their DNA and inserting them into the Code Module, allowing him to destroy it afterwards.]]

** "Operation: E.N.D", "Operation: T.R.A.I.N.I.N.G.", "Operation: S.L.U.M.B.E.R." and "Operation: G.R.A.D.U.A.T.E.S." focused on two topics: Numbuh 2's younger brother, Tommy, training to be a Kids Next Door operative and the theft and recovery of the Kids Next Door Code Module. The Code Module is needed to induct new Kids Next Door operatives by inserting samples of their DNA after graduation, [[spoiler:specifically, boogers,]] but before Sector V recovered it prior to Tommy's graduation (especially with the computer game that served as the prequel to the episode), [[BigBad Father]] needed it to power a machine that turns Kids Next Door operatives into animals; after failing to steal it himself at the Artic Base while Tommy was in the middle of his training, it was later stolen from the Moonbase by the Teen Ninjas[[spoiler:, plus, another traitorous Kids Next Door operative invited to Numbuh 86's slumber party]]. [[spoiler:Tommy had no choice but to resign from the Kids Next Door to avoid being hit by the device, then [[HoistByHisOwnPetard turned said device against Father and the Delightful Children]] by stealing their DNA and inserting them into the Code Module, allowing him to destroy it afterwards.]]

** "Operation: E.N.D", "Operation: T.R.A.I.N.I.N.G.", "Operation: S.L.U.M.B.E.R." and "Operation: G.R.A.D.U.A.T.E.S." focused on two topics: Numbuh 2's younger brother, Tommy, training to be a Kids Next Door operative and the theft and recovery of the Kids Next Door Code Module. The Code Module is needed to induct new Kids Next Door operatives by inserting samples of their DNA after graduation, [[spoiler:specifically, boogers,]] but before Sector V recovered it prior to Tommy's graduation, [[BigBad Father]] needed it to power a machine that turns Kids Next Door operatives into animals. It was after Father tried to steal the Code Module from the Arctic Base in "T.R.A.I.N.I.N.G.", it was to be guarded instead at the Moonbase, where the Teen Ninjas stole it in "S.L.U.M.B.E.R.", and then was eventually recovered by the Sector V Team in "G.R.A.D.U.A.T.E.S." (especially with the computer game that served as the prequel to the episode). [[spoiler:Tommy had no choice but to resign from the Kids Next Door to avoid being hit by the device, then [[HoistByHisOwnPetard turned said device against Father and the Delightful Children]] by stealing their DNA and inserting them into the Code Module, allowing him to destroy it afterwards.]]