[[quoteright:346:http://static.tvtropes.org/pmwiki/pub/images/OperationZERO_4110.jpg]]

''Operation: Z.E.R.O.'' ('''Z'''ero '''E'''xplanation '''R'''eveals '''O'''rigins) is TheMovie to the cartoon ''WesternAnimation/CodenameKidsNextDoor''.

In this movie, an old evil named Grandfather is recommissioned by his son, Father and takes control of the world. He turns everyone into Senior Citizombies and soon, the KND begins falling apart as one by one, all of its operatives turned into Senior Citizombies... Including Numbuh 2, 3, 4, 5, 362, 60, and 86...

It looks like Numbuh One is going to have to turn to a hero... A hero named Numbuh Zero...

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!!''Operation: Z.E.R.O.'' provides examples of the following tropes:

* AbusiveParents: Grandfather to his two sons.
* AdultsAreUseless: For a show that usually ran on this trope, this movie provides the ultimate subversion in that [[spoiler:Numbuh One's father, who turns out to be the fabled Numbuh Zero, ultimately ends up saving the day]].
* AuthorityEqualsAsskicking: [[TheCaptain Numbuh 362]] manages to hold off an age-ified Numbuh 60 all on her own [[spoiler:before finally being age-ified herself.]]
* BambooTechnology: But of course.
* BigDamnHeroes: Sector V saves the Kids Next Door Museum [[spoiler:'''and''' the Moon Base.]]
* BondOneLiner: "Catch."
* ByTheLightsOfTheirEyes: Wally and Kuki hiding inside a closet.
* CallingTheOldManOut: Grandfather gets called out for his {{jerkass}}ery near the end of the movie. Somewhat surprisingly, [[spoiler:[[EvenEvilHasStandards it's]] ''[[EvenEvilHasStandards Father]]'' [[EvenEvilHasStandards who calls him out]], instead of Numbuh Zero.]]
* CaptainObvious: Numbuh One: [[spoiler:"B-but, if you're my uncle, then that makes Grandfather my grandfather!"]] Lampshaded by Father:
-->'''Father:''' What are you, president of the obvious club or something?
* ChekhovsGag:
-->'''Numbuh One:''' This will take perfect aim and timing, old friend. Sure you can do it?\\
'''Numbuh Two:''' Nope!
* ColonyDrop: [[spoiler:Sector V fires the ''entire Moon Base'' at Grandfather. ''[[NighInvulnerability He survives!]]'']]
* ConspicuousCG: Most notably the Moon Base.
* CouldHaveAvoidedThisPlot: Number 362 admits that if she listened to Numbuh One, the whole mess would never happen.
* CrazyAwesome: Numbuh One's methods are noted in-universe to be mindblowingly dangerous.
-->'''Numbuh Five:''' Man, Numbuh One. I'm glad I'll never have to fight you. You're crazy.
* CutenessProximity: Numbuh Three is more interested in finding out "who's the most huggable kitty" than fighting Crazy Old Cat Lady's feline minions.
* DangerouslyGenreSavvy:
** Grandfather. And HOW. He practically destroys the KND and succeeds in retaking control of the world like before but worse. Yet instead of kicking up his heels like most would do and relaxing with some tapioca he then focuses his attention on destroying a last HopeSpot, the book of KND which led to his defeat the last time. Even when one of his own sons show some resistance to their family's evil ways he decides to zombify him instead of just leaving him be.
** And it was by restoring Grandfather's memory that Father showed another moment of GenreSavvy. To steal the memory-restoring device from the museum, he sent two groups of villains: one to the museum and one to assault the moonbase as a distraction. Almost all KND operatives believed the museum raid to be the distraction. Later, when Father assembled the other villains so they'd see him using the device on Grandfather, he not only expected Numbuh One to show up but also ''wanted'' it to happen. It turns out the device couldn't be activated without boogers from an active KND operative and, since Father's and the Delightful Children's involutary inductions were already over, he needed to take it from somebody.
* DareToBeBadass: "I'll show you what [[MyHeroZero the number 0]] can do."
* DistantPrologue: The movie starts a few decades ago with Numbuh Zero rebelling against Grandfather's oppression.
* DoomyDoomsOfDoom: Kids Next Door V.A.C.D.O.O.M. [[FunWithAcronyms (Very Airy Cannon Delivers Oscillating Oomph Massively)]]
* EnemyMine: Numbuh One and Numbuh Zero works together with Father and the Delightful Children [[spoiler:a.k.a. Numbuh Zero's brother and Sector Z, respectively.]]
* EvilOverlord: Grandfather
* EvilOldFolks: Grandfather, and anyone he turns into Senior Citizombies.
* EyeBeams: Grandfather uses fiery eye beams on Father.
* FacePalm:
** Crazy Old Cat Lady, from Numbuh Three's antics.
** Numbuh 362 and 86 have a few too.
** And a double-facepalm for Nigel.
* FacingTheBulletsOneLiner: "You're out of my will, you ''brat''!"
* {{Fanboy}}: Numbuh 101 is this for Sector V. He geeks out at being saved by the team, has various items that belonged to the members of Sector V from past episodes and even has all their autographs![[labelnote:*]]But not in red.[[/labelnote]]
* FightingYourFriend: Numbuh One is forced to fight the rest of Sector V [[spoiler:because they've all been turned into Senior Citizombies.]] Naturally, he doesn't give it his all [[spoiler:and quickly finds himself on the losing end, until Sector Z came to help.]]
* {{Foreshadowing}}: [[spoiler:What comes before the number 1?]]
** Also, Numbuh Five says to Numbuh One that she's glad she'll never have to fight him, since he's crazy. [[spoiler:Sure enough, he does end up fight her, along with the rest of his zombified team]]
* FreudianExcuse: Father's got a damn good one. It seems that being raised by a horrendous asshole who turns people into zombies doesn't exactly inspire you to be a good person.
* FunnyBackgroundEvent: When Father was explaining his plan to Numbuh One, you can see Grandfather (not yet recommissioned) trying to walk off stage, only to be stopped by the open palm of someone off-screen. Twice.
* GenerationXerox: [[spoiler:TheHero is a (currently) bald british person with glasses who fights a HumanoidAbomination who likes PlayingWithFire. Are we talking about Numbuh One or Numbuh Zero?]]
* GoneHorriblyRight: Father's [[spoiler:delightfulization of Sector Z.]]
* GoToYourRoom: Grandfather said this to Numbuh Zero word for word, followed by a healthy dosage of "Or else!"
* HeroicBSOD: Numbuh One has this in the middle of the movie for a while.
* HeroicSacrifice: Numbuh Five fought off an age-ified Cree to give her teammates time to escape.
* HeroWorshipper: An interesting case where the worshipper is TheHero, and the one being worshiped is a past legendary hero, [[MyHeroZero Numbuh Zero]]. [[spoiler:Further irony that the past hero was TheHero's BumblingDad all along]].
* HopeSpringsEternal: [[DangerouslyGenreSavvy Grandfather knows kids with hope can still defeat him]], which is why he sets out to find the Book of KND and destroy it.
* HumanoidAbomination: Granfather. A reality-bending, [[NighInvulnerability indestructable]], [[TheVirus zombifying]], [[PlayingWithFire fire-bending]] wizard who puts Franchise/{{Cthulhu|Mythos}}, [[Wiki/TheSCPFoundation SCP-682]], and [[WesternAnimation/MyLittlePonyFriendshipIsMagic Discord]] to shame.
* IKnowYoureInThereSomewhereFight: Numbuh One fights off [[spoiler:the age-ified Sector V]], with little luck.
* ImpactSilhouette: Tommy crashing through a wall, propelled by a burst of hamsters.
* InformedAbility: In the beginning, Numbuh One says he knows a fighting technique that he can use to defeat four enemies at once which he's "always wanted to try." This becomes sort of a BrickJoke; near the climax of the special, he's attacked by his {{Brainwashed}} teamates and mentions it again, but says he did ''not'' want to try it on ''them''. He never actually gets a chance to try it, so we can only assume this is true.
* ItsQuietTooQuiet: Parodied...
-->'''Numbuh Four:''' It's quiet in here...\\
'''Numbuh Three:''' Yeah... three quiet.\\
'''Numbuh Four:''' Three quiet? What the crud is that supposed to mean?\\
'''Numbuh Three:''' It's one more than "two quiet"!
* KissOfDeath
* LaserGuidedAmnesia: The Decommissioning Chamber from previous episodes makes an appearance again [[spoiler:as the KND's secret weapon to defeat Grandfather by decommissioning him.]]
* MacGuffin: The Book of KND.
* MadeForTVMovie
* MeaningfulEcho: "I am Kids Next Door/We are Kids Next Door." Doubles as BookEnds.
* MeaningfulName: Numbuh Zero's brother being named Benedict, obviously alluding to [[http://en.wikipedia.org/wiki/Benedict_Arnold Benedict Arnold]] [[spoiler:and also foreshadowing the revelation that he's also Father.]]
* TheMovie
* MyHeroZero: Numbuh Zero
* NegatedMomentOfAwesome:
** Numbuh One boasts that he has a super cool new move that can take down four enemies at once. Unfortunately [[spoiler:the first time he tries to use it, the villain had just succeeded with their goal and called a retreat before he could even attack one of the four guys around him. Then he thinks to use the move a second time later in the movie, but because it's against his zombified team, he hesitates and ends up defending the whole fight until Sector Z comes to help.]]
** There's also Father's little burst of raw anger against Grandfather (during which even he was cowering in fear), [[spoiler:but then decides ScrewThisImOuttaHere when he gets to depressed to fight.]] This could really be seen as TropeCodifier.
* NiceJobBreakingItHero: It was because of [[spoiler:Numbuh One's rash decision to stop the villains' convention]] that Father managed to recommission Grandfather. He got a HeroicBSOD because of it.
* NighInvulnerability: Grandfather. They [[spoiler:[[ColonyDrop crash the Moon Base]] on him and he dusts it off like it was nothing! (To be fair, the KND didn't expect it to hurt him; it was part of a plot to make him lose his memories, which ''did'' work.]]
* NobodyHereButUsStatues: The Villains masquerade as their own statues in the KND museum.
* NoOntologicalInertia: Everything goes back to normal after [[spoiler:Grandfather was decommissioned.]]
* OffhandBackhand: David (Numbuh 0.2) to Citizombie Numbuh Two.
* OhCrap:
** The villains have this as a collective reaction when Grandfather declares he was going to age-ify everyone who's ever been a kid.
** Grandfather himself during the climax.
--->'''Grandfather:''' (''after grabbing the Book of K.N.D from Numbuh 0'') Yes! With this my victory is complete! Nothing will be able to stop me now! Not even... (''looks up and in a meek voice'')... [[spoiler:a gi-hugic flaming moon base?!]]
* OurZombiesAreDifferent: The Senior Citizombies. They're always old no matter how old they actually were before they're transformed, but they're still very capable fighters and are able to age-ify others. They also retain their basic memories and personalities, although they are totally subservient to Grandfather.
* PlayingWithFire: Father, of course. Apparently he got it from his dad.
* PreAsskickingOneLiner:
** "Zero!"
** "Special delivery from Numbuh One, you salty old pirate!"
** "I'm going to throw Numbuh 60 ''a retirement party.''"
** "This is going to be... delightful."
** "Next stop: ''way'' down the lane!"
* {{Pun}}: "And it looks like I couldn't have ''picked'' a better operative." Said by Father as he... collects Numbuh One's genetic material.
* PungeonMaster: Numbuh Two, as always. Numbuh Three and Numbuh 86 do it as well.
* RaisingTheSteaks: The KND's hamsters are turned into Citizombies as well.
* RapidAging: His primary ability is to age everything he touches, though not only does he age them rapidly, he turns them into his "Senor Citizombie" minions. All individuals he ages gain the ability to do it to others.
* TheReveal: Hooo boy, we got a [[RuleOfThree triple reveal]] over here. This is gonna be a doozy, so hold on!
** First, there's the identity of [[MyHeroZero Numbuh Zero]], who turns out to be none other than [[spoiler:Numbuh One's {{bumbling dad}}, Monty Uno!]]
** Second, it turns out that [[spoiler:Father is actually Monty Uno's brother, the one who refused to fight [[BigBad Grandfather]] years ago. Making him ''Numbuh One's biological uncle, and [[ShapedLikeItself Grandfather his grandfather!]]'']]
** And lastly, there's the fact that [[spoiler:[[CreepyChild The Delightful Children]] are actually the legendary Sector Z!]] Numbuh One has a temporary freak out due to this:
--->'''Numbuh One:''' [[spoiler:The Delightful Children from Down the Lane are the missing Kids Next Door members of Sector Z! Dad, the Delightful Children from Down the Lane are the missing Kids Next Door members of Sector Z!]]
* RoaringRampageOfRevenge: Father becomes ''even scarier'' when he's mad, with his [[PlayingWithFire fire powers]] becoming more powerful than ever before and seemed like it was about to match Grandfather's. [[spoiler:Subverted, he doesn't even do anything after shouting and simply goes back to his house to eat some ice cream.]]
* SarcasmBlind: Tommy replies to Numbuh Four's insult by saying [[SarcasmMode "Ha ha, that was so funny, I forgot to laugh."]] [[TheDitz Numbuh Three]] proceeds to ask why he doesn't laugh now, seeing as he forgot and all.
* ShoutOut: The zombified Toiletnator swings around using toilet paper, and lower himself upside-down in a posture typical of Franchise/SpiderMan.
* ShutUpHannibal:
-->'''Grandfather:''' Even you, my son, are zero compared to me.\\
'''Zero:''' That may be, but [[spoiler:''my'' son is Numbuh One]]!
* {{Squick}}: In-universe example: when Numbuh Two (with Numbuh 362 and Numbuh 86 behind him) contacts Numbuh Three and Numbuh Four, he is greeted with [[spoiler:the two of them age-ified and holding hands, declaring they've found each other before kissing on-screen!]] All three of them are ''horrified'' by this, and Numbuh 362 immediately orders to end transmission.
* TemptingFate: Numbuh Three wishes Numbuh Five was in Sector V's treehouse when she and Numbuh Four were there. She shows up the next second [[spoiler:as a Senior Citizombie]]
* ThroatLight: All the characters turned into Senior Citizombies have streams of light pouring out of their eyes and mouth during the transformation.
* TitleDrop: Though the phrase "Numbuh Zero" is thrown around quite a lot, there are two instances where a character exclaims "Zero!" can count:
-->'''Grandfather:''' I'm giving you three seconds to go to your room, or else! Three... Two... One...\\
'''Numbuh Zero:''' [[PreAsskickingOneLiner Zero!]]
:: and...
-->'''Grandfather:''' [[TheReasonYouSuckSpeech Even you, my son, are zero compared to me.]]
* VictoryGuidedAmnesia: [[spoiler:Monty Uno (a.k.a. Numbuh Zero)]] defeats the villain by using a device created to [[spoiler:erase the memories of decomissioned [=KND=] operatives]].
* VillainTeamUp: Many of the KND villains assemble to attack the Museum and the Moon Base.
* WellDoneSonGuy: [[spoiler:Father, ironically.]]
* WhamLine:
-->'''Father:''' [[spoiler:I'm your dad's brother, Benedict. Your uncle!]]
* WhatTheHellHero: Numbuh One gets chewed out by Numbuh 362 for not following orders even though he single-handily saved ''everyone''.
* WhenEldersAttack: The Senior Citizombies.
* WorldHealingWave: [[spoiler:When Grandfather is defeated, his influence on the whole Earth is erased, returning the KND trees changed into factories to their original state.]]
* ZergRush:
** The Senior Citizombies swarming over the KND trees.
** Also the zombified hamsters in the Uno house.
* ZombieApocalypse: Grandfather's plan to {{take over the world}} is to turn everyone who's ever been a kid (i.e. ''everyone in the world'') into Senior Citizombies and force them to work in tapioca factories.

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