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Codename: Kids Next Door is a show where Your Mileage May Vary. Kids may actually like this show, and even teens and adults. However, some may not like it based on its premise.

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!!YMMV Tropes found in ''WesternAnimation/CodenameKidsNextDoor'':

* BigLippedAlligatorMoment: In "Operation: W.H.I.T.E.H.O.U.S.E.", [[spoiler:Numbuh One goes [[TheIncredibleHulk Hulk]] [[HopeSpot and briefly fights off all of the U.S. forces]] before they ZergRush him and he wakes up from [[OrWasItADream what appears to be]] a normal dream.]] It makes ''slightly'' [[ItMakesSenseInContext more sense in context.]] The apparent assumption was [[spoiler:he realized it was a dream, and thus he could do almost anything he wants.]]
* CrazyAwesome: ''[[WorldOfBadass EVERYONE.]]''
* CrowningMomentOfAwesome: Has [[Awesome/CodenameKidsNextDoor its own page]].
* CrowningMomentOfFunny: Has [[Funny/CodenameKidsNextDoor its own page]] too.
* CrowningMomentOfHeartwarming: Has [[Heartwarming/CodenameKidsNextDoor its own page]] [[RuleOfThree three]].
* CrowningMusicOfAwesome: The rock opera episode, complete with a score by GWAR, who re-performed the song themselves after being unable to find stock copies.
* DesignatedHero: Sometimes one can't help but tilt their heads at the KND's actions, like in the episode where the agents fight against a rabid, Batman-esque dentist, whose heinous crime is to improve the kids ''horrendous'' dental health. On another episode, the kids hijack a delivery truck to destroy Type-P torture devices, a.k.a. ''pianos''. So, what about the kids who ''like'' playing? They never stop to think about an hypothetical little Timmy whose only dream in life is to become a famous musician?
** In the case of Nightbrace, he turned out to actually be quite heinous because [[spoiler:he wasn't even a dentist, but an insane ''candy shop owner'' who couldn't stand kids eating the sweet candy that ''he gave them'', so by night he went out to fix their teeth. Even the ''real'' dentist didn't approve.]]
** As for the piano incident, the focus of the episode was actually about the KND being injured and replaced by hamsters. The piano incident was the pretext for their injuries to occur, so we weren't given the full context since it was a Cold Open. Given how KND villains tend to behave, in context the pianos were probably part of some villain's scheme to enslave children with piano lessons, or something along those lines.
* DesignatedVillain: Done deliberately with Professor XXXL, who in all his appearances is just trying to create the perfect snowcone, but the KND always ruin his plans thinking he is doing something evil.
* EarWorm
** ''Rainbow Monkeys, Rainbow Monkeys...''
** And the opening theme. (''Dun nun nun NUN nun . . .'')
** Robin Food's theme tune.
** HIP HOP. HIP HOP. GONNA DROP DA BUNNY!
* EnsembleDarkhorse
** Rachel, a.k.a. Numbuh 362.
** '''[[spoiler: Sector freaking Z!!!!!]]''' from ''WesternAnimation/OperationZERO''. You won't ''believe'' the huge fanbase they have after only, what? ''Five minutes'' of sceentime?!?!
** Tommy Gilligan, a.k.a. The Tommy, Numbuh Two's younger brother. He was a big secondary character later in the series, but only because of his popularity early on.
* EvilIsSexy: Cree Lincoln.
* FanPreferredCouple
** [[BattleCouple Numbuh One×Numbuh Five]]
** Numbuh One×Numbuh 362
** Numbuh Two×Numbuh 86
** Numbuh Three×Four were this in the first season thanks to fan reaction to "Operation: O.F.F.I.C.E.". The escalating ShipTease in the subsequent seasons upgraded them into OfficialCouple status.
** Numbuh 65.3×Lizzie: They're both glasses-wearing geeks. In "Operation: L.E.A.D.E.R.", Lizzie pretends to flirt with him and says she likes his pocket protector, making 65.3 blush. In "Operation: G.I.R.L.F.R.I.E.N.D.", 65.3 tells Nigel to say "hi" to Lizzie for him.
* FoeYay: Numbuh Five and Henirich Von Marzipan.
* [[spoiler:FridgeBrilliance: Chad's FakeDefector status can seem like an AssPull despite his explanation of why he launched the Moonbase, a plot Nigel foiled... wait. ''[[EvilIsDumb Why did he interact with Nigel to begin with]]?'' [[JustifiedTrope Really]]?]]
* FunnyAneurysmMoment
** A day-long KND marathon which ends with kid dominance over Cartoon Network being proclaimed is immediately followed by -- yes, Creator/AdultSwim.
** "Operation: G.R.O.W.N.-U.P." has Father and a grown-up Numbuh One facing off, and, after Father comments on how useless the DCFDTL are, Numbuh One responds with "that must run in the family". And then, in the same scene, Numbuh One says that "his Grandma can throw better than [Father]." [[spoiler:Which, considering Father is Nigel's uncle... yeah.]]
*** The first comment doubles as HilariousInHindsight, considering that Grandfather actually does find Father to be useless.
** In the Kenny and the Chimp pilot, Kenny got... Swine Flu.
** "Operation F.U.T.U.R.E." is a Franchise/{{Terminator}} parody, where girly girls take over the world from an all girls school and the last rowdy boys are fighting a losing battle against them. Many academic studies show that in RealLife the girls are increasingly taking over, due to being generally better students and that todays rowdy boys are going to be tomorrow's losers.
** [[http://online.wsj.com/article/SB10001424052748704111504576059713528698754.html?mod=WSJ_hp_mostpop_read#articleTabs=article Tiger Moms]] -- the battle against adult tyranny is as important as ever!
* GrowingTheBeard: The Season 1 Finale established continuity for the series, as well as the introduction of Father and the fact that the KND is not just the five featured on the show, but rather many different sectors.
* HarsherInHindsight: In ''Kenny and the Chimp'', one of the joke diseases that Kenny get is ''Swine Flu''. And then in 2009...
* HoYay: Mr. Wink and Mr. Fibb. Not only are they always joined at the hip, but they also live together and the ''Film/JamesBond'' villains they're based on are canonically gay.
* JerkassWoobie
** The Delightful Children. As it turns out, [[spoiler: they were the former members of the KND called Sector Z]]. See NightmareFuel below.
** Father, after ''WesternAnimation/OperationZERO'' (and minor moments in "I.T." and "C.A.K.E.D.-F.I.V.E.")
* MemeticBadass: Just watch "Operation: K.N.O.T." and ''try'' to say Moosk doesn't have the makings of this.

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* MoralEventHorizon
** Chester trying to feed ''live children'' to sharks.
** Nurse Claiborne trying to outright ''murder'' Numbuh Three and turn her into breakfast cereal.
** Grandfather when he turns the world into a dystopia with children being forced to work in tapioca factories. And that's JUST the backstory.
** Father trying to bake children into a cake.
* NauseaFuel
** One episode where "chicken pox" takes the form of literal squirming chicken heads sticking out of one's skin.
** A villain named the Common Cold attacks by siphoning mucus out of his nose. Especially lovely when he starts to ready a really big attack.
** In "Operation: P.I.N.K.E.Y.E.", being hit with a water balloon filled with pinkeye mucus would cause crusty red stuff to grow all over you. The episode's villain turns out to be using this crusty stuff as the crumbs in crumb cake. It gets even worse at the end of the episode: "So if the pinkeye was the crust, then what was the filling?" ([[spoiler:achoo!]])
** Even worse? In ''two'' later episodes, Numbuh Two ''still eats the stuff'' and [[LampshadeHanging he comments about it]] as well!
** Is no one going to mention "Operation: V.I.R.U.S.", where there is a close-up of Cree's gigantic and disgusting pimple?
** A few of TheMovie's Senior Citizombies have ''sagging'' ''GagBoobs.'' [[spoiler:This included the citizombified versions of Numbuh Three and Five.]]
* NightmareFuel: Apparent in a few episodes.
** The Delightful Children are terrifying when you know who they '''really''' are, and what happened to them. [[spoiler: They used to be Sector Z]], until they were captured by Father himself, and put them through such rigorous torture (or as he puts it, Delightfulization) to the point that's it's quite literally IMPOSSIBLE to turn them back (any attempts are just temporary). To think that [[spoiler:such honorable members of the KND]] have been turned into such monsters is not only scary, but you have to think of what kind of treatment Father put a couple of '''ten year olds''' to, not to mention that the torture was so intense that they work as one being.
** Heinrich, Numbuh Five's nemesis, trying to dunk a live rabbit in molten chocolate. Terrifying.
*** Even worse when he soon after [[spoiler:tries to dunk Abigail herself into the molten chocolate]].
**** [[spoiler:Heinrich used to WORK WITH Abigail before!]]
**** FromBadToWorse! Even worse than before! [[spoiler:Heinrich fell into the chocolate and became an eldritch abomination!]]
**** Ever worse than that! [[spoiler:[[ArsonMurderAndJaywalking Heinrich is really a pretty little girl!]]]]
** The Crazy Old Cat Lady in her first appearance.
** Grandfather, Father was originally scary, Grandfather takes it to another level. Sure, he's got some humor, but overall, he's just scary. To elaborate, he's capable of turning anyone he touches into a citizombie...which naturally have the same ability as well. He's even capable of zombifying the world in a sense, turning it into a colorless world with tapioca factories for KND treehouses.
*** Not to mention what [[TheDarkTimes his reign was implied to have been like]]. It's pretty much one big old time ChildLabor sweatshop taken UpToEleven.
** The ''PiratesOfTheCaribbean'' parody episode. Somehow, turning into licorice skeletons seems ''scarier'' than turning into regular ol' skeletons. And that's not mentioning what happens to them when the sun comes up...
** The [[AndIMustScream delightfulization]] process. Can you ''imagine'' being permanently brainwashed into being evil?! There's also the fact that '''''you're probably alive and aware throughout the entire ordeal and maybe even afterwards...'''''
** Number 3 when she's pissed she's just plain scary especially her appearance. And her anger gives a whole new meaning to BewareTheNiceOnes.
* PeripheryDemographic
* {{Squick}}: Anything that involves Nurse Claiborne. Her apple crumble is topped with eye shit!
*** That's nothing compared to what the apple crumble filling is implied to be. How can Numbuh Two stand to eat the stuff, knowing just what it's made out of?
** Rainbow Monkey Cereal is made with [[spoiler:''shredded Rainbow Monkey dolls.'']]
** Zombiefied Numbuh Three and Four kissing each other. (Shudders)
*** Could've looked way cuter if they were normal, but as old zombies...(pukes)
** Toenails collection.
*** Even worse was the subtle revelation that the Delightful Children ''use the bathroom together!'' Seriously, what the FUCK?!?
* TastesLikeDiabetes: It's not hard to see why Numbuh 4's not all that fond of Rainbow Monkeys.
* TearJerker: Has its [[TearJerker/CodenameKidsNextDoor own page.]]
* TheyWastedAPerfectlyGoodPlot: The KND "Splinter Cell" arc foreshadowed an internal civil war in the KND between the extremist Splinter Cell that believes all adults must be destroyed vs. the more moderate faction that believes only the evil adults should be stopped. It is also revealed that the Splinter Cell had been kidnapping KND scientists for unknown reasons. However, near the end of the series, it turns out that the Splinter Cell is just an front for the KND scientists, who fake their kidnappings so they have more free time to watch their favorite science fiction shows as well as manage "the Galactic Kids Next Door", the workings of which were left very vague in the end.
* ToyShip: ''Several''.
** In the main team alone; 3+4 didn't so much have subtext as it was just plain text from the start, 2+5 was a slightly more debatable case, and 1+5 had some good chemistry. But let's not get into the ''web'' that the fans ([[ShipTease and creators]]) have spun.
* UglyCute: [[WhatMeasureIsANonCute Ramon 4]] from Op SATURN.
* UnfortunateImplications: In Op CARAMEL, we find out that bitter villain Heinrich Von Marzipan is really a girl magically turned into an evil boy. After he's returned to being Henrietta Non Marzipan, she instantly stops being a villain. So apparently the cure to all male evilness is to become [[TheUnfairSex female]].
** Lizzie brainwashes Numbah One. He breaks out of it... ''and keeps dating her''. EasilyForgiven much?
* VillainDecay: Father started out as... well, pretty much {{Satan}}. Scary, always cloaked in darkness, and biblical in his wrath- and of course, his voice is Maurice [=LaMarche=] at his scenery-chewing best. Contrast this with the middle-aged dork he became later on.
** Mega Mom and Destructo Dad were considered an extreme threat to the KND as a whole in their first appearance. It was also implied they took out the entire Kids Next Door (Not sure about Moonbase Operatives) with the exception of [[spoiler:their son,]] Numbuh 274. Besides of the fact that often attend all of the Villain gatherings, their [[spoiler:connection to Chad]] is never mentioned again, even after he [[spoiler:becomes a DoubleAgent]]. Also, they are never seen using their powers in future appearances.
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