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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.

* 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.]]'' even the little KND operatives.
* CreepyCute: The titular lice is "Operation: L.I.C.E."--they eat hair and sport some rather impressive fangs, but the bugs are rather adorable. ''Especially'' the baby lice seen on Numbah Two near the end.
* CrowningMusicOfAwesome: The rock opera episode, complete with a score by GWAR, who re-performed the song themselves after being unable to find stock copies. The episode was mostly Squick but the music was awesome.
* 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. Even Numbah One knows his plan and goes along with it, and the kicker was he actually tried the perfect snow-cone before he was taken back by his friends.
* EarWorm
** ''Rainbow Monkeys, Rainbow Monkeys...''
** And the opening theme. (''Dun nun nun NUN nun . . .'')
** Robin Food's theme tune.
** "Operation: F.O.O.D.F.I.T.E."? ''ALL OF IT''
* EnsembleDarkhorse
** Rachel, a.k.a. Numbuh 362, who literally ate her way through brocoli to stop the spread of it.
** [[spoiler: Sector Z]] from ''WesternAnimation/OperationZERO''. Who developed a huge fanbase after only five minutes of screentime.
** 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.
* EvilIsCool: Father, a pitch-black ManOnFire and MagnificentBastard with a [[EvilIsHammy terrifyingly hammy voice]].
** Especially his HeelFaceTurn against Grandfather.
* FanPreferredCouple
** [[BattleCouple Numbuh OneÎNumbuh Five]]
** Numbuh OneÎNumbuh 362
** Numbuh TwoÎNumbuh 86
** Numbuh ThreeÎFour 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. Even the last episode revealed that they'd be husband and wife.
** Numbuh 65.3ÎLizzie: 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 Heinrich Von Marzipan.
** There's definitely some between Numbuh One and Chad Dickson, as well. "Operation: T.R.E.A.T.Y." is fodder for it with the ChainedHeat situation and a flashback to Nigel and Chad's formerly close friendship. The entire situation reads like two exes being forced to work together after a bad breakup. The fact that Chad condescendingly calls him "Nigey" -- his ex-''girlfriend's'' AffectionateNickname for him -- definitely doesn't help.
* [[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:
** "Operation: G.R.O.W.N.-U.P." has Father and a grown-up Numbuh One facing off, and, after Father comments on what a "disappointment" 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, and considering that it turns out Grandfather actually does find Father to be a disappointment... yeah.]]
** In the Kenny and the Chimp pilot, Kenny got... Swine Flu, a major epidemic in summer 2009.
** "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 today's 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!
** In 2003, "Operation: P.O.P." aired, where the "Soda Control Act" forbids anyone under the age of 13 from drinking soda, forcing kids to "brew" soda illegally and sell and drink it in speakeasies a la the days of Prohibition. In 2013, [[http://en.wikipedia.org/wiki/New_York_City_soft_drink_size_limit a law]] was almost passed in New York City that would have forbade anyone from purchasing/selling drinks with a certain sugar content in any size bigger than 16 ounces. One can only wonder what the Kids Next Door were up to during the months of battling over the law's legality.
* 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, it came back (swine flu was around in the mid-1970s).
** In "Operation: C.A.T.S.", Numbah 5 claimed that she was a dog person. [[spoiler: Then came ''Operation: D.O.G.H.O.U.S.E.''...]] where she ended the honor roll student's curse of turning into homework-munching were-dogs.
* HeartwarmingInHindsight: "Operation: O.O.M.P.A.H." already gives Numbuh One and his father Mr. Uno several sweet moments. However, as noted on the FridgeBrilliance/CodenameKidsNextDoor and Heartwarming/CodenameKidsNextDoor subpages, ''OperationZERO'' reveals [[spoiler: that Mr. Uno had a horrible, horrible father, and instead of growing up into a child hater like his brother, Mr. Uno tries his best to keep up with his son and be a genuinely good dad.]]
* HilariousInHindsight: The BigLippedAlligatorMoment in "Operation: W.H.I.T.E.H.O.U.S.E." got funnier after Creator/BenDiskin got [[WesternAnimation/HulkAndTheAgentsOfSMASH a new job]].
** The BigBad goes by "Father" and has a personal connection to TheHero's father. [[Manga/FullmetalAlchemist Sound familiar]]?
** The fact that the show is now 13 years old is this to some fans.
** The toughest, bravest member of the team and best at hand-to-hand combat is a blond boy named Number [[Literature/{{Divergent}} Four]].
* 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.")?
** [[spoiler: Chad]] following the reveal that [[spoiler: his betrayal of the KND was [[FakeDefector a ruse]]]]. On one hand, he's still an incredibly egotistical and bitter person, to the point that he [[spoiler: tries to kill Nigel in Operation T.R.E.A.T.Y.]] However, it's easy to feel some degree of sympathy for him given [[spoiler: the fact that he willingly sacrificed his own reputation and friendships within the KND; for the sake of his mission.]]
* MemeticBadass: Just watch "Operation: K.N.O.T." and ''try'' to say Moosk doesn't have the makings of this.
* MemeticMutation: One fansite dedicated to re-captioning screenshots had characters discuss a clothing-optional resort. "The resort" has been a KND meme ever since.
** "[[http://www.youtube.com/watch?v=CqOc3tHunPM I hate everyone]]" [[labelnote:Explanation]]Father's deadpan reaction to a space station crashing down on his house. Has become popular as a response to particularly annoying or infuriating posts or events.[[/labelnote]]

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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. [[SarcasmMode Especially lovely]] when he starts to ready a really big attack. Probably why he was DemotedToExtra after his first 2 appearances.
** 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.]]
** At the end of "Operation: C.A.K.E.D.-T.H.R.E.E., after the KND defeat the Delightful Children's Giant Birthday Present Robot with the help of an army of Chicks, Numbuh 1 is about to take the cake from the Delightful Children when the Chicks defecate all over it. Numbuh 1 then convinces the Delightful Children to eat the cake, which they do. It also counts as an in-universe example, as several children are grossed out from watching the Delightful Children eat the soiled cake on their television sets.
** Awesome music aside, "Operation F.O.O.D.F.I.T.E" grossed some people out, especially the giant slam-witch monster.
* ParanoiaFuel: More than one viewer 13 and older has entertained the thought that maybe, just ''maybe'', they had once been KND operatives and have [[LaserGuidedAmnesia since been decommissioned]].
* PeripheryDemographic
* SeasonalRot: Ironically around the time the series began to establish its mythos and continuity, which was about season 2 and onward for some people when Flanderization took hold of Numbahs 3 and 4 despite all the character development everyone got, especially those two despite their Flanderization.
* ShipsThatPassInTheNight: Numbuh 86 and Numbuh 60 is a rather popular ship, despite the fact that they never really had any onscreen interaction. (The closest was Operation: T.R.A.I.N.I.N.G., when Arctic Base got a distress signal from Moonbase. And even that turned out to be just Father disguised as Numbuh 86.)
* ShockingSwerve: Operation P. R. E. S. I. D. E. N. T. It's doubtful that anyone saw [[spoiler: President Jimmy's FaceHeelTurn]] coming.
* SpiritualLicensee: This show can be considered the closest thing to an animated adaptation of the ''[[Film/SpyKids Spy Kids]]'' films.
* {{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?!?
* SuspiciouslySimilarSong: The two songs by Music/{{GWAR}} that are featured in "Operation: F.O.O.D.F.I.T.E.".
* TastesLikeDiabetes: It's not hard to see why Numbuh 4's not all that fond of Rainbow Monkeys.
* TheyWastedAPerfectlyGoodCharacter: Many villains like the Common Cold or Mega Mom and Destructo Dad were only the villains of one episode.
* 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.
** There's also the matter of the 1/362 ShipTease. Despite ''Operation: I.T.'' showing how close they were and ''Operation: G.I.R.L.F.R.I.E.N.D.'' all-but-confirming that Rachel has feeling for Nigel beyond friendship, it was never resolved. The trope comes in with after [[spoiler: Lizzie dumped Nigel,]] which looked like it was foreshadowing that he would end up with Rachel. You can imagine how many fanfics have centered around them getting together.
* 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.
* 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.
* {{Woolseyism}}: All over the place in the Mexican Spanish dub, albeit not [[BaseBreaker always for a good way]], since all the characters speak using thick Mexico City accents, to the grade is very difficult not only for other Latin American viewers, but also for ''Mexican'' viewers outside Mexico City, to understand many dialogues without previous knowledge of the culture of Mexico City. The fact many of the voice actors are from Mexico City and also was dubbed there doesn't help.
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