[[caption-width-right:350:In a meta way, [[AdoredByTheNetwork Timmy]] [[{{Uncanceled}} won]].]]

->'''Jimmy:''' Jimmy Neutron, boy genius.\\
'''Timmy:''' Timmy Turner... boy!
-->-- The title characters introducing themselves to each other

'''''The Jimmy Timmy Power Hours''''' are a trilogy of hour-length specials produced for and aired on {{Nickelodeon}} in 2004 and 2006. As suggested by the title, they are a series of {{Crossover}}s between two of the network's most popular cartoons, ''Westernanimation/TheAdventuresOfJimmyNeutron'' and ''WesternAnimation/TheFairlyOddparents''.

It all starts in the first special, when Timmy, in need of a good science project, wishes to go to the greatest lab in the universe, and Cosmo and Wanda transport him to Jimmy Neutron's secret lab. An accidental meeting between the two results in Jimmy getting transported to Timmy's world, where he mistakenly believes Cosmo and Wanda are holographic supercomputers (because he thinks Timmy is also a genius), and Mr. Crocker steals his transportation device, which he then uses to take over Fairy World. Back in Retroville, Timmy develops mutual affections for Cindy Vortex and accidentally turns Goddard into a killer robot. The boys eventually manage to solve their respective problems and return to their own worlds, and all ends well...

...Until two years later, when the second installment, ''When Nerds Collide!'', came out. Timmy is looking for a date for the Friday the 13th school dance, and since [[RichBitch Trixie Tang]] isn't around for him to unsuccessfully ask out, he goes to Retroville again, this time taking Cosmo and Wanda with him, so he can get Cindy to go out with him. This naturally does not sit well with Jimmy. As if that weren't enough, Professor Calamitous is on the loose again, and so are the Anti-Fairies.

Finally, in the third special, ''The Jerkinators!'', Timmy and Jimmy put aside their differences and start hanging out together. They grow bored with their outmatched villains and create a new villain to fight. But things take a turn for the worse when this new villain, named [[FluffyTheTerrible Shirley]], steals Cosmo and Wanda's magic powers and Jimmy's intelligence!

Outside of these specials, Jimmy and Timmy would join forces a few more times in the ''NicktoonsUnite'' video games. See also ''WesternAnimation/RugratsGoWild'' for another Nicktoon crossover.

Not at all to be confused with ''WebAnimation/JimmyNeutronHappyFamilyHappyHour'', though the name was likely inspired by this.
!!These specials contain examples of:
* ArtShift: Characters go from hand-drawn to CGI and vice-versa in each other's worlds.
-->'''Timmy:''' [[BreakingTheFourthWall Hey, why is everything so bulgy?]]
* TheBGrade: Crocker, mistaking Jimmy for Timmy, gives him an F, which burns his hand.
* BigBad: Crocker and a BrainwashedAndCrazy Goddard in the first, Anti-Cosmo [[DiscOneFinalBoss then]] Professor Calamitous in the second, and Shirley in the third.
* BreakingTheFourthWall: Everyone points out the fact that ''WesternAnimation/TheFairlyOddParents'' world is 2D and Jimmy Neutron is in CGI.
* BrickJoke: One that comes to fruition in the second movie; In an earlier Jimmy Neutron episode involving Carl's dreams, we learned that he's married to a turkey in his dream canon. In "When Nerds Collide", they have to make Jorgen Von Strangle angry and choose to do this by violating Da Rulez. The first thing they do? Make Carl pretend to fall in love with a turkey.
* ContinuityNod: Jimmy mentions in ''When Nerds Collide!'' that Professor Calamitous must have escaped the time of dinosaurs, where he was left with several other ''Jimmy Neutron'' villains in "League of Villains". Also, his original partner is Dr. Moist, a one-off villain from an episode that [[OutOfOrder hadn't aired at the time.]]
** In the first special, Cosmo and Wanda introduce themselves to Jimmy the same way they did to Timmy in the ''Fairly Oddparents'' pilot.
* CurbstompBattle: Jimmy and Timmy's team up in the third one turns their encounters with their individual villains into this.
* DenserAndWackier: Compared to Jimmy Neutron, since the crossovers generally use humor more like WesternAnimation/TheFairlyOddparents - resulting in the Jimmy Neutron characters acting even sillier than usual and getting into screwier situations - as well as much more slapstick. This happens especially when the characters are actually in Dimmsdale (which compared to Retroville is practically CloudCuckooLand).
* DiscOneFinalBoss: Anti-Cosmo in the second one. After his defeat, Professor Calamitous takes over.
* ExactWords: Jorgen told Anti-Cosmo nobody in their universe would be able to free the Anti-Fairies. Anti-Cosmo then looked for somebody from ''[[TheAdventuresOfJimmyNeutron another universe]]''.
* FluffyTheTerrible: Shirley in ''The Jerkinators''.
* FourFingeredHands: The ''Fairly Oddparents'' characters get an extra finger on each hand in Jimmy's world, while the ''Jimmy Neutron'' characters lose a finger in Timmy's world.
* FunnyBackgroundEvent: When Cindy is ranting to Libby about Jimmy not asking her to the dance, Libby says that [[TemptingFate it's not like a date will fall through the ceiling.]] Cue Timmy falling through the ceiling. In the following scene, you can see Libby shaking a finger at the ceiling [[RetroactiveWish trying to summon things]].
* GrandFinale: ''The Jerkinators!'' was intended to be this for both series. However, ''Fairly Oddparents'' got UnCancelled, while Jimmy's show got a SpinOff (''WesternAnimation/PlanetSheen'').
* HypnotizeThePrincess: Jimmy's mom is hypnotized into thinking she's Mighty Mom in the first special. [[WhatHappenedToTheMouse The special never shows her getting unhypnotized]].
* HypocriticalHumor: "How does he do it, ''magic''?"
* LoveTriangle: Jimmy/Cindy/Timmy
* InsufferableGenius: AJ in the first special.
* MagicVersusScience: Most evident in the second special. In fact, it sort of comes of as Timmy cheating, as everything Jimmy makes is derived from his understanding of the universe, while Timmy can wish almost anything into existence.
* NiceJobBreakingItHero: Pretty much the case in all three movies.
* RunningGag: In the second special, Timmy running behind trees to "invent" stuff.
** Also, Cindy grabbing Timmy's lips before he has a chance to wish for something.
* ShoutOut:
** "[[Film/TheWizardOfOz Pay no attention to the fairies operating the fudge-head suit!]]"
** "[[Film/{{Scarface 1983}} Say hello to my big glowing friend.]]"
** Cindy, when walking through Timmy's "lab" mentions [[Film/BackToTheFuturePartII Mr. Fusion.]]
** Professor Calamitus imprisons Jimmy's family in [[Franchise/StarWars Carbonite.]]
* StoryBreakerTeamUp: InUniverse, this sets off the plot of the third movie. When Jimmy and Timmy team up, [[CurbstompBattle their Rogues Galleries don't fair well]]. This makes things boring, so they decide to literally CreateYourOwnVillain to get a challenge.
* SureLetsGoWithThat: Cosmo and Wanda let Jimmy think they're computer programs so he'd not find out they're fairies.
* TalkingToHerself: Timmy and Libby were already voiced by Anna Sztejner in Polish.
* TemptingFate: When Cindy's complaining about not having a date, Libby says that it's not like a date will fall through the ceiling. Cue Timmy falling through her ceiling!
* UltraSuperDeathGoreFestChainsawer3000: "The Decimator", Timmy's video game about blowing the world up, rated "Triple-G for Gratuitous Gutwrenching Gorefest", which he installs into Goddard, accidentally turning him into a killer robot.
* VillainDecay: Denzel Crocker was the main villain of the first power hour. Then look at him in the others.
* VillainTeamUp: Anti-Cosmo and Professor Calamitous in the second. Interestingly, while Anti-Cosmo is the one who ends up indulging in a double-cross, Calamitous is the one who ends up being the FinalBoss.
* WhatHappenedToTheMouse: Other than the previously mentioned hypnotism in the first special, In "When Nerds Collide", Timmy changes the sign in Crocker's liar to read The Timmy Cave, in order to convince everyone it is his lab. This is never undone.
* WrongNameOutburst: In ''The Jerkinators''.
-->'''Timmy:''' Cosmo, you idiot! I'm sorry, force of habit. Jimmy, you idiot!