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YMMV / Codename: Kids Next Door

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  • Alternative Character Interpretation:
    • Are The Little Traitor Dudes For Children's Defense, the "negative" counterparts of The Delightful Children From Down The Lane really good guys or just bad guys who were brainwashed like what happened with their counterparts?
    • Given what we know now of Sector Z and the true nature of the Delightful Children from Down the Lane, was Lenny's attempt of a reverse mole ploy a sincere attempt to break free of the brainwashing before the delightfulization returned? This fanfic goes with this idea.
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    • Is the global organization a rebellious group of kids devoted to defying adult authority? Or a benevolent, somewhat Knight Templar-ish group protecting the children of the world from those that wish to harm or unjustly oppress them? Although OP: Z.E.R.O. seems to confirm on the latter, some viewers tend to scale strictly on the former.
    • Is Father a psycho (with a convincing Freudian Excuse) suffering from Villain Decay, or a Woobie, Destroyer of Worlds?
    • Does the KND inadvertently continue a Cycle of Hatred by decommissioning operatives who turn 13? The older members of the KND would likely have no reason to arbitrarily turn on their friends and join up with the teens and adults who have been menacing them for most of their lives. But the KND rejecting them and trying to remove their memories could result in former operatives feeling betrayed so they devote themselves to destroying the organization and all it stands for. Those who are successfully decommissioned no longer have any type of loyalty or camaraderie for the KND and easily recruited by their former enemies because they don't know any better. "Operation: M.A.U.R.I.C.E." and Numbuh 12's betrayal seemingly supports this theory.
      • Building on this theory is Cree's behavior. While it's made painfully clear what side she's on, there are some hints that it might actually be because she crossed the Despair Event Horizon over growing older rather then just being a traitor. In "Operation: M.A.U.R.I.C.E.", when Abby bemoans the fact there's nothing she can do to escape growing up, Cree gets excited because she's been waiting for Abby to say that, hinting that she went through something similar and didn't have anyone to pull her out of it. Additionally, there are several hints throughout the series that Cree does genuinely want to make up with Abby, her own terms or not, but mishaps continue to happen that cause her to double down on her ideals.
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    • The entire show is a game a bunch of kids are playing, or a story they made up. (This theory seems to be gaining ground on 4chan)
      • And adding on to that theory, Numbuh One is a kid who possibly moved away or died. Likely the former, because Numbuh One eventually returns.
    • Knowing what we know now about Lizzie Devine/Numbuh Vine according to GKND, did she REALLY love Nigel or was this all just a ruse? On the same topic, it could be possible that every example of Lizzie being an idiot or oblivious to being in danger (like in Operation D.A.T.E.) shows she's been engaging in Obfuscating Stupidity the whole time. And also, was she being purposefully annoying towards him in the later half of the series as an attempt to make him break up with her, but since that didn’t work, she ultimately had to end it between them in Operation G.I.R.L.F.R.I.E.N.D?
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    • Jerry from BULLIES. While on the surface his story about wanting revenge on Numbuh 4 is sympathetic, we never really got Numbuh 4's side of the story either, just that "he deserved it". Was Jerry being entirely honest and Numbuh 4 just thought he deserved his permanent wedgie for being a nerd, or did Jerry do something to Numbuh 4 first and he refused to own up to it?
  • Ass Pull: The idea that Chad Dickson was a double agent and was helping Sector V throughout all their missions. Even in episodes that featured him prominently, it's clear that he was evil and that his defeats weren't due to any self-sabotage on his part.
  • Author's Saving Throw: Adulthood being equated to a "disease" by a representative of the Galactic KND was seen by a few viewers as seeming just a bit too outlandish for the series. The April Fools' Day Viral Marketing has since revealed the Galactic KND to be Scary Dogmatic Aliens, somewhat amending this particular complaint.
  • Awesome Music: 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.
    • There's also Licorice, a catchy sea shanty about Stickybeard and Heinrich crossing paths with Captain Black John and his cursed crew.
  • Badass Decay:
    • Father lost a lot of his credibility after "Operation G.R.A.D.U.A.T.I.O.N", and lost it completely when his role as the sinister main villain was taken away from him by Grandfather in "Operation Z.E.R.O". Even after Grandfather was defeated, Father never fully recovered. Also qualifies as Villain Decay.
    • Chad after his Face–Heel Turn. He was once one of the best KND operatives there is, but he's reduced to a Mook Lieutenant and loses a lot of competence points as a result. Justified given his status as The Mole in the teens.
  • Big-Lipped Alligator Moment: In "Operation: W.H.I.T.E.H.O.U.S.E.", Numbuh One goes Hulk and briefly fights off all of the U.S. forces before they Zerg Rush him and he wakes up from what appears to be a normal dream. It makes slightly more sense in context. The apparent assumption was he realized it was a dream, and thus he could do almost anything he wants.
  • Creepy Cute: 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 Numbuh Two near the end.
  • Crosses the Line Twice: According to a brief line Grandma Stuffem sings in "Op: FOODFITE," her giant "Slamwitch" is "made of cheese and puppy feet!" After a culmination of Bread, Eggs, Milk, Squick lyrics that get progressively squickier, it's darkly hilarious.
  • Designated Villain: 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 Numbuh 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.
  • Ensemble Dark Horse
    • Rachel, a.k.a. Numbuh 362, who literally ate her way through broccoli to stop the spread of it. Not to mention, a lot of fans pair her with Numbuh 1, causing her popularity to raise even higher. On the Kids Next Door Wiki, they had a poll where users could vote on their favorite operative. Numbuh 362 had more votes then Numbuh 2, a main member of the team.
    • Sector Z from Operation: Z.E.R.O., who developed a huge fanbase despite only having 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.
  • Evil Is Cool:
  • Evil Is Sexy: Cree Lincoln. It's no wonder why Numbuh 2 has a crush on her.
  • Fan-Preferred Couple
    • 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 Ship Tease in the subsequent seasons upgraded them into Official Couple status. Even the last episode revealed that they'd be husband and wife.
    • 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.
  • Fandom-Specific Plot:
    • Fics about the kids being decommissioned, usually with them ceasing to be friends afterwards (though Kuki and Wally almost always fall in love somehow which is canon), are incredibly common. There's a sub-genre of these where Kuki and Wally are angsty, lonely teens who are mysteriously drawn to each other despite not recognizing one another.
    • The main characters' children time-traveling back from the future is also a fairly common one.
    • A lot of shipping stories will have Numbuh 1 dump Lizzie before hooking up with Numbuh 5 or Numbuh 362.
    • At the end of the series, Numbuh 1 leaves Earth in order to join the Galactic Kids Next Door. This will either be ignored or have him return from space, generally as a teen.
    • All fics that involve the Mirror Universe will most likely have the Nega version of Numbuh 362(Lehcar). Her personality is mostly the same across all fics: She was a supporter of Nega Numbuh 4 before he was overthrown and is trying to either get him back in power, or take over for herself. She can also have a Villainous Crush on Numbuh 1, which tends to combine nicely with the above plot of Numbuh 1 and Numbuh 362 hooking up.
  • Foe Yay: Numbuh Five and Heinrich/Henrietta 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 Chained Heat 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 Affectionate Nickname for him — definitely doesn't help.
  • "Funny Aneurysm" Moment:
    • "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]." 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.
  • 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, 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.
  • Numbuh 5 and Cree's father Mr. Lincoln is a pretty obvious parody of Bill Cosby. It's much less charming in the wake of the sexual assault scandals (that he was eventually found guilty in) that crushed Mr. Cosby's family-friendly image.
  • "Operation: T.R.I.C.Y.C.L.E." featured a character called Numbuh 10-Speed, a parody of Lance Armstrong. Not so funny anymore after the reveal that Armstrong used steroids to win his Tour de France titles. Lampshaded in the Galactic Kids Next Door ARG site, where entering Numbuh 10-Speed's name returns the response "undergoing testing".
  • The schtick of Count Spankulot, a minor villain in the series, was mildly amusing in the early 2000s, but his kind of character would not fly at all in a contemporary cartoon. Its unfortunate enough that his whole gimmick is being a vampire that stalks and spanks kids (while played for laughs and portrayed as being wrong, corporal punishment like this is taken much more seriously in modern times), but his behaviour and prison record for doing this in-series now makes it very easy to equate him with being a possible pedophile with a sick fetish (though thankfully in-universe his character is merely a vampiric Child Hater).
  • Genius Bonus: In "Operation F.A.S.T.-F.O.O.D.", the father shark complains about having to stop at a red light, saying, "Doesn't anyone realize I need to keep moving?" Biologically speaking, this is true—sharks need to be in constant motion, or else they die.
  • Growing the Beard: 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. Many agree that this change to the show was for the better.
  • Harsher in Hindsight
    • 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.", Numbuh 5 claimed that she was a dog person. 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.
    • At first, it was ok to not give sympathy to the Delightful Children From Down The Lane, but after the movie where we realized that they used to be Sector Z, a missing KND sector and were "delightfulized", it would mean that their "negative" counterparts, The Little Traitor Dudes For Children's Defense were once evil operatives of the Destructively Nefarious Kids or DNK, a negative counterpart of the Kids Next Door where they are devoted to tormenting children everywhere rather than saving them.
    • The KND's Splinter Cell was an extremist group who wants to get rid of adults bad AND good which the KND opposes. In Operation T.R.E.A.T.Y., the group are revealed at least and it turned out to be fakes made by Numbuh 74.5239 and Numbuh Infinity who are aligned with the Galactic Kids Next Door who are above even Soopreme Leader Numbuh 362 that fight against adulthood in space. Just as we knew about the Splinter Cell comes the teaser for the next possible sequel series... The G:KND has Nigel make the decision on activating something that would likely endanger the planet Earth in order to get rid of adulthood there once and for all which Chad begs him to not go through with it because of their friends and family still on the planet. To confirm Chad's fears, Numbuh Vine/Lizzie alerts Wally and Kuki to evacuate EVERYONE on Planet Earth kid and adult alike! In a way, the Splinter Cell DOES exist and it is named the Galactic Kids Next Door who will take down adulthood even on the planetary scale!
    • Potentially, Lizzie in general. She's been Nigel's girlfriend for what might very well have been years, starting in Operation: L.I.Z.Z.I.E., and continuing up until their break-up in Operation: G.I.R.L.F.R.I.E.N.D., with her getting several episodes and even A Day in the Limelight, with a bunch of Character Development in between. The G:KND "teaser" revealed her to be a Galactic-Level Operative, Numbuh Vine. In one fell swoop, every single one of her appearances in the series just got put into question.
    • There have been reports of 'troubled teen camps' that are practically concentration camps for kids instead of Jews. If there is any reason for the KND to exist in real life, it is this.
  • Heartwarming in Hindsight: "Operation: O.O.M.P.A.H." already gives Numbuh One and his father Mr. Uno several sweet moments. However, as noted on the Fridge Logic and Heartwarming subpages, Operation: Z.E.R.O. reveals 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.
  • Hilarious in Hindsight:
    • The Big-Lipped Alligator Moment in "Operation: W.H.I.T.E.H.O.U.S.E." got funnier after Ben Diskin got a new job.
    • Along similar lines, Diskin would go on to another show where he went against adults being jerks (albeit in this case, the adult that caused him to become a Monster of the Week- the Big Bad- and the guy who made him feel that way are speculated to be the same person, rather than a whole group of evil adults).
    • The Big Bad goes by "Father" and has a personal connection to The Hero's father. Sound familiar?
    • The fact that the show turned 13 years old in 2015 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 Four.
    • Fourth grade class president Jimmy Nixon McGarfield's infatuation with Lizzie Devine, when you consider the recent revelation in the GKND teaser video that Lizzie was actually a botanical alien operative of the Galactic Kids Next Door disguised as a human. Her affection for Numbuh 1, who Jimmy viewed as a rival, probably wasn't even sincere. It's a good thing that Jimmy's assistant Anna revealed her love for him and he subsequently returned her feelings, abandoning his fixation on Lizzie.
    • Years after the show first aired, Numbuh 1's voice actor became the English dubbed voice for Joseph Joestar. He used the exact same voice. If you're a fan of both Western Animation and Anime, it becomes a case of Cant Unhear It.
      • For added fun, Operation D.O.G.F.I.G.H.T. had Numbuh 2, also voiced by Diskin, engaged in a rivalry with another kid pilot, who frequently shot down Numbuh 2's planes. Joseph being in constant plane crashes is a Running Gag in JoJo's.
      • A similar case happens in Tenkai Knights, where he plays Toxsa. For those who don't know, Toxsa is the biggest nerd on the team and sounded exactly like Numbuh 2, causing another case of Cant Unhear It.
    • The scene from the episode C.A.K.E.D F.I.V.E where the orbital station was destroyed by starship in the atmosphere, became a mirror to the signature scene from Rogue One where a Hammerhead Frigate rammed into two Star Destroyers to destroy the force field generator at the orbit.
    • In F.L.U.S.H., Toiletnator mistakes the other villains as Sector V disguised as them and thinks Knightbrace is Numbuh 4. In A.W.A.R.D.S. Numbuh 4 does disguise as Knightbrace.
  • Ho Yay:
    • Mr. Wink and Mr. Fibb. Not only are they always joined at the hip, but they also live together and the James Bond villains they're based on are canonically gay.
    • Numbuh Five and Henrietta Von Marzipan. Their reunion in "C.A.R.A.M.E.L." was nothing short of adorable. Add to that the fact that Henrietta's nickname for Abby, "Liebchen", means sweetheart in German...
  • Iron Woobie: Numbuh 5. While she usually is quite self-assured, it's easy to feel a bit sad for her sometimes. Her Dark and Troubled Past consists of her sister's betrayal, the Noodle Incident that caused Numbuh 1 to lose his hair permanently and her to step down as Sector V's leader (for God's sake, she nearly freaked out at the thought of stepping back into the role!), and then there was what happened with Heinrich. Not to mention the things that happened to her onscreen, such as when she was turned into a weredog. One can't help but feel a bit of respect for her as well for keeping her cool through it all, though.
  • Jerkass Woobie
    • The Delightful Children. As it turns out, they were the former members of the KND called Sector Z.
    • Father, after Operation: Z.E.R.O. (and minor moments in "I.T." and "C.A.K.E.D.-F.I.V.E.") Turns out that he spend most of his childhood under an abusive father, constantly treated as The Unfavorite, and is always afraid of standing up to his dad. After recommissioning Grandfather, he's repaid for his efforts with disdain and humiliated in front of his fellow villains. No wonder why Villain Decay set in, given that most of his self-confidence was shattered into pieces.
    • Chad following the reveal that his betrayal of the KND was a ruse. On one hand, he's still an incredibly egotistical and bitter person, to the point that he 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 the fact that he willingly sacrificed his own reputation and friendships within the KND; for the sake of his mission.
    • Numbuh 86. Sure, she's an unpleasant Jerkass who constantly gets on people's nerves with her incessant nagging. However, "Operation S.L.U.M.B.E.R." reveals that she never really had any friends because of her unpleasant attitude, with Numbuh 12 being the only person then to befriend her. But once Numbuh 12 makes a Face–Heel Turn and defects to the teens, you can't help but feel a bit sorry for her.
  • Launcher of a Thousand Ships: Numbuh 1 easily has the most ships to his name. He has been shipped with all of his teammates(although Numbuh 5 is the most popular), Numbuh 86, Lizzie, Numbuh 362, and even The Delightful Children!
    • Numbuh 362 isn't much farther behind. Beyond Numbuh 1, she has been shipped with Numbuh 60, Numbuh 86, and Chad.
  • Memetic Badass: Just watch "Operation: K.N.O.T." and try to say Moosk doesn't have the makings of this.
  • Memetic Mutation:
    • One fansite dedicated to re-captioning screenshots had characters discuss a clothing-optional resort. "The resort" has been a KND meme ever since.
    • "I hate everyone" Explanation 

transmission interrupted

connection re-established

  • Moral Event Horizon
    • Chester trying to feed live children to sharks. He even tries to murder Numbuh Three with the proclamation that he'll deep-fry her after a failed first attempt!
    • 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. He's revealed to have crossed it long ago when he transformed Sector Z into the Delightful Children permanently.
  • Nausea Fuel
    • One episode where "chicken pox" takes the form of literal squirming chicken heads sticking out of one's skin.
      • Plus, when the chickens themselves are in low quality, they look like writhing maggots in the kid's flesh.
    • 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. Probably why he was Demoted to Extra 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?" (achoo!) Even worse? In two later episodes, Numbuh Two still eats the stuff and he comments about it as well!
    • "Operation: V.I.R.U.S.", where there is a close-up of Cree's gigantic and disgusting pimple.
    • A few of The Movie's Senior Citizombies have sagging Gag Boobs. 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.
    • At the beginning of Operation P.A.R.T.Y., Sector V (minus Numbuh 5) is looking over items that were taken from Cree's room. Numbuh 4 asks about a tube of pink stuff, and Numbuh 1 says that they think it's "some kind of unmeltable ice cream treat." Numbuh 4 then licks it, comments that the flavor is good.... and then Numbuh 5 smacks him with her hat and shouts, "THAT'S DEODORANT, FOOL!" One can't help but wonder whether or not it was actually used prior to being stolen. (Shudders)
  • One True Pairing: While KND shipping is often comparable to a minefield at the best of times, just about every fan ships Numbuh 3 and Numbuh 4 together.
  • Paranoia Fuel: More than one viewer 13 and older has entertained the thought that maybe, just maybe, they had once been KND operatives and have since been decommissioned.
  • Periphery Demographic: Like many before and after it, this is a show in a child-centric network about children who fight teens and adults that many teens and adults love.
  • The Scrappy: Lizzie Devine's first appearance where she's Easily Forgiven for attempting to brainwash Numbuh One didn't do wonders for her reputation among fans, and even after Characterization Marches On, it was a Fandom-Specific Plot in even non-shipping fanfics to have Numbuh One dump her for the better-liked Numbuh Five or 362.
    • Rescued from the Scrappy Heap: Much of the hate towards Lizzie has died down both after "Op: GIRLFIREND" and the reveals in the GKND ARG that she was a secret galactic-level alien KND operative all along.
  • Seasonal Rot: 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 Numbuhs 3 and 4 despite all the character development everyone got, especially those two despite their Flanderization. Some fans also complained the show began to take itself too seriously, given the humour in many early episodes was the self awareness of the kids antagonising anything standard kids would.
  • Ships That Pass in the Night: 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.)
    • The Kid and Henrietta Von Marzpan have a decent following despite the two characters never meeting on screen.
  • Shocking Swerve: Operation P. R. E. S. I. D. E. N. T. It's doubtful that anyone saw President Jimmy's Face–Heel Turn coming.
  • Some Anvils Need to Be Dropped: Adults do not have the right to abuse kids, kids have the right to stand up for themselves when being treated unfairly by adults, and every kid has the right to a safe and fun childhood.
  • Spiritual Licensee: This show can be considered the closest thing to an animated version of the Spy Kids films (aside from Spy Kids: Mission Critical).
  • Squick:
    • Anything that involves Nurse Claiborne. Her apple crumble is topped with pinkeye, and even 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 shredded Rainbow Monkey dolls.
    • Zombiefied old Numbuh Three and Four kissing each other.
    • The toenails collection and the subtle revelation that the Delightful Children use the bathroom together!
    • The chicken pox looked like tiny chicken heads coming out of the skin of the kids, but from further away where the details of the little chicken heads couldn't possibly be well rendered, they ended up looking like maggots growing out of the children.
  • Suspiciously Similar Song: The two songs by GWAR that are featured in "Operation: F.O.O.D.F.I.T.E.".
  • Tastes Like Diabetes: It's not hard to see why Numbuh 4's not all that fond of Rainbow Monkeys.
  • They Wasted a Perfectly Good Character:
    • Many villains like the Common Cold or Mega Mom and Destructo Dad were only the villains of one episode.
    • Word of God even acknowledges that it's a shame Numbuh 60 didn't get much development.
    • Chad being a villain. Though he had a few episodes where he was the main villain, for the most part he was treated like just another teenager that the KND had to face.
    • Numbuh 12 was never seen again after she betrayed the KND and joined the teenagers after realizing that since she was almost 13 and would be decommissioned soon otherwise.
    • Sector Z had a memorable role in Operation: Z.E.R.O. but after their big reveal that they were the Delightful Children brainwashed all along, the plot point is never revisited nor given any closure.
    • "The Steve", the leader of the teenagers, only appeared in the second to last episode of the series.
    • Maurice aka Numbuh 9. He was introduced as something of a Good Counterpart to Chad and introduce the major plot point to the series that Some of the elite operatives continued to work as deep agents for the KND, even after turning 13. After his introduction episode though he more or less gets Demoted to Extra.
  • They Wasted a Perfectly Good Plot:
    • 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. However, a teaser animatic featuring the original cast and produced by Mr. Warburton suggests that a civil war plot expanding upon the working of the GKND may be on the way. Still, many fans would've preferred this plot without the GKND.
    • There's also the matter of the 1/362 Ship Tease. 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 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.
    • Some fans were hoping that more would've came from Numbuh 1's report in "Operation: A.R.C.H.I.V.E.S.", especially since the ending indicated that there was at least some level of truth in it.
    • In most fiction, adults hate teenagers far more then they do small children and teenagers hate being bossed around by adults. Instead of being complete allies to the adults, it would have been interesting if the teenagers were a more independent group that battled both adults and kids.
    • As revealed in Operation Z.E.R.O. Nigel Uno is the nephew of the KND's greatest enemy, Father. However this relationship dynamic between them is never explored or touched upon again for the rest of the series and considering Father was aware of this, it is odd it was never brought up before.
  • Toy Ship: 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 (and creators) have spun.
  • Ugly Cute: Ramon 4 from Op SATURN.
  • Values Dissonance: Count Spankulot, a vampire who spanks disobedient children. Along with spanking children being frowned upon in modern society, the idea of a grown man going around and spanking children he doesn't know would be considered, well, creepy nowadays.
  • The Woobie: Sector Z. "Operation Z.E.R.O." reveals that they were permanently transformed into the Delightful Children, with no hope of turning back into their former selves, robbed of their free will and ripped apart from their families and loved ones who have no idea what became of them. What's worse is that they've forced to turn on their beloved organisation, becoming one of the KND's greatest enemies. When they are forced to turn back into the Delightful Children, their last words to Numbuh 1 is to tell the KND that they missed them.
  • Woolseyism: All over the place in the Mexican Spanish dub, albeit not 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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