[[quoteright:343:http://static.tvtropes.org/pmwiki/pub/images/Captainunderpantscover.jpg]]
[[caption-width-right:343:That's a pretty tiny building.]]
->''Faster than a speeding waistband! More powerful than boxer shorts! Able to leap tall buildings without getting a wedgie!''

A series of '''[[InsistentTerminology EPIC]] [[BlatantLies NOVELS]]''' written by Dav Pilkey. Its main character is ExactlyWhatItSaysOnTheTin.

George Beard and Harold Hutchins are two mischievous kids at Jerome Horwitz Elementary School. They enjoy pulling off practical jokes and making comic books to brighten the lives of their fellow students. But one day, their evil principal, Mr. [[EmbarrassingFirstName Benny]] Krupp, manages to record video of them pulling off a series of pranks that causes their football team to forfeit a game, and blackmails the two boys by threatening to show the video to the football team unless they give up their mischief-making ways and do all sorts of hard labor.

Not wanting to go through with this, George and Harold order a [[HypnoRay hypnotic ring]] and use it to hypnotize Mr. Krupp into giving them the tape. Then, for laughs, they hypnotize him into believing he is their comic book creation, Captain Underpants. But as a result of [[HypnoFool their inability to handle the ring properly]] (and pouring water over his head, which they weren't supposed to do), Mr. Krupp now transforms into Captain Underpants whenever he hears the sound of fingers snapping.

Initially, Mr Krupp as Captain Underpants was powerless (aside from being a mean shot with underwear), as opposed to his comic incarnation, who was a classic FlyingBrick. However, as of the third book, he has acquired super powers.

There are also three SpinOff titles: ''The Adventures of Super Diaper Baby'', ''The Adventures of Ook and Gluk: Kung-Fu Cavemen From The Future'', and ''[[ComicBook/DavPilkeyDogMan Dog Man]]''. These books are presented as [[ShowWithinAShow graphic novels written by George and Harold]], with ''Super Diaper Baby'' featuring a CrossOver with their Captain Underpants comic.

'''The books to date are:'''
# ''The Adventures of Captain Underpants'' (1997)
# ''Captain Underpants and the Attack of the Talking Toilets'' (1999)
# ''Captain Underpants and the Invasion of the Incredibly Naughty Cafeteria Ladies from Outer Space (and the Subsequent Assault of the Equally Evil Lunchroom Zombie Nerds)'' (1999)
# ''Captain Underpants and the Perilous Plot of Professor Poopypants'' (2000)
# ''Captain Underpants and the Wrath of the Wicked Wedgie Woman'' (2001)
# ''Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy, Part 1: The Night of the Nasty Nostril Nuggets'' (2003)
# ''Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy, Part 2: The Revenge of the Ridiculous Robo-Boogers'' (2003)
# ''Captain Underpants and the Preposterous Plight of the Purple Potty People'' (2006)
# ''Captain Underpants and the Terrifying Return of Tippy Tinkletrousers'' (2012)
# ''Captain Underpants and the Revolting Revenge of the Radioactive Robo-Boxers'' (2013)
# ''Captain Underpants and the Tyrannical Retaliation of the Turbo-Toilet 2000'' (2014)
# ''Captain Underpants and the Sensational Saga of Sir Stinks-A-Lot'' (2015)

Creator/DreamWorksAnimation produced an animated film ''WesternAnimation/CaptainUnderpantsTheFirstEpicMovie'' directed by Rob Letterman (''WesternAnimation/MonstersVsAliens'') and David Soren (''WesternAnimation/{{Turbo}}'') and written by Nicholas Stoller (''Film/GetHimToTheGreek'', ''Film/TheMuppets''). Creator/KevinHart and Creator/ThomasMiddleditch voice George and Harold, while Creator/EdHelms plays the Captain.

Now has [[Recap/CaptainUnderpants a recap page]]. Don't worry, all the {{One Paragraph Chapter}}s are AlreadyDoneForYou.

----
!!The main Captain Underpants books contain examples of:

* TheAce: George is established as this in ''The Terrifying Return of Tippy Tinkletrousers.'' In the span of five minutes, he outwits an [[AdultsAreUseless auto mechanic who mocks a bullying victim,]] then intimidates the bullies into submission using only a tie -- on his ''first day of kindergarten.'' He later masterminds the plan to humiliate and scare Kipper Krupp and his gang into reforming, and is only slightly fazed when he has to adapt his plans due to some lucky guesswork from Kipper.
* AddedAlliterativeAppeal: The book titles starting with the second one, after the "Captain Underpants and the..." part.
* AdultsAreUseless: Mr. Krupp is usually competent as a principal when it comes to punishing George and Harold, but allows his nephew Kipper Krupp and his friends to bully and terrorize kindergartners.
* AerithAndBob: The three aliens in the third book: Zork, Klax, and Jennifer. Also, Carl, Trixie and [[TheLastOfTheseIsNotLikeTheOthers Frankenbooger]] in the sixth and seventh books.
* AffectionateParody: Captain Underpants is very much one of Superman - he is first described in the same manner of Superman's own "More powerful than a locomotive..." way. His costume is a takeoff of Superman's [[SpandexLatexOrLeather spandex]] and BadassCape. Within his comics inside the universe, he shares Superman's FlyingBrick powers. Then, outside the comics, he actually gets the powers. For a bonus, he's also one of Batman - inside his comics, he has a 'waistband utility belt' which is just as CrazyPrepared as Batman's. He even once says "To the underwear cave!", though he actually lacks such a place. As an added bonus, his in-comic origin story is identical to Superman's--doomed planet, only survivor, adopted by rural folk, father appearing in dream sequence, et cetera.
* AfroAsskicker: Five-year-old George had an afro, and he beat up some older bullies with his necktie.
* AliensInCardiff: The books are set in Piqua, Ohio, once known as the Underwear Capital of the World.
* AlliterativeName: Harold Hutchins.
* AluminumChristmasTrees: Ms. Ribble makes the students eat chunky tofu ice cream at her retirement party in Book 5. It [[http://www.bakespace.com/recipes/detail/Tofu%20Ice%20Cream/14417/ actually exists]], minus the chunky part.
* {{Animesque}}: [[spoiler:Old Harold's artstyle develops into this, as shown by the Dog Man graphic novel]].
* AndThenJohnWasAZombie: See FutureMeScaresMe.
* AntiClimax: Parodied OnceAnEpisode. Near the end, there's some climactic event which gets its own chapter (the Robo-Plunger rebuilding the school, George and Harold attempting a HeelFaceBrainwashing on Ms. Ribble, [[spoiler:Tippy Tinkletrousers getting stepped on by Zombie Nerd Harold]], etc.). The chapter in question, or the one immediately following, is always called "To Make a Long Story Short" and simply says something like "they did" or "it worked".
** To make an even bigger conundrum even more anticlimatic, "The Perilous Plight of the Purple Potty People"'s chapter is followed by a similar chapter, 'To Make a Longer Story Shorter'. Ironically, this chapter is actually one character longer than the preceding one.
*** In Book 10, we actually get to see the "long story" of Book 9 in its entirety.
* ArsonMurderAndJaywalking: In the fifth book when Wedgie Woman starts giving the officers that attempt to stop her wedgees:
-->'''Police Officer:''' "Call the Army, call the Marines, call a '''HAIRSTYLIST'''!!!"
** In book 6, Melvin's new killer robot has the power to punch through cinder blocks, crush steel in its vice-like grasp, plow mercilessly through poorly written run-on sentences, and slice bagels.
* ArtEvolution: In the first three books, the illustrations have a very flat and much cruder look. However, by the end of the third book, the art started to look noticeably crisper and more three-dimensional.
* AssShove: In book 10, Tippy Tinkletrousers' Robo-Trousers are equipped with a thermonuclear bomb, which are activated by having a robotic tentacle pull it out through the nether regions.
* AtrociousAlias: Professor Poopypants' nation has this as their [[PlanetOfHats Hat]]. His first appearance as a villain has him attempting to give everyone else stupid names after being sick of being laughed at for his.
* AuthorAvatar: George and Harold are basically Dav Pilkey split into two kids: Dav also had many cruel teachers, who were always punishing him for acting out[[note]]Or so they thought. As it turned out, he has both dyslexia and ADHD, two conditions that were simply ruled out as misbehavior in the 1970s[[/note]] and drawing "silly books."
* AuthorsSavingThrow: In-universe - Captain Underpants' origin story is made to make him invulnerable to starching.
* BadFuture: [[spoiler:As Tippy Tinkertrousers appeared before the already-traumatized Kipper and his gang with a giant pair of robotic pants, he inadvertently causes them to go insane from the terror, and Mr. Krupp was blamed for his crime. Mr. Krupp was then fired from being principal of Jerome Horwitz Elementary School. As a result, Mr. Krupp didn't become Captain Underpants and the first three villains from the first three novels succeeded in accomplishing their goals. This means that the moon was blown up, and there's two separate invasions of the earth- one by talking, flesh-eating toilets, and the other by giant zombies under the control of aliens. It's not pretty.]]
** [[spoiler: In the tenth book, George and Harold decide to swear off pranks and comic books and become model students after witnessing all of the chaos brought about by their time traveling. They meet themselves thirty years in the future, having become jerkass teachers themselves and working for an elderly Mr. Krupp. However, this becomes subverted when the young George and Harold finally defeat Slightly Younger Tippy Tinkletrousers by summoning the elderly Captain Underpants to assist his younger time-shifted self in the fight.]]
* BaitAndSwitch: [[spoiler: When George and Harold go to the future and their future selves don't remember the event happening in their pasts, the characters chalk it up to bad writing. Given that this series lives and breathes on BetterThanABareBulb, this would probably be true in any other book. However, it's actually foreshadowing for the fact that the pair from the future is actually the Yesterday Pair from the present, and that George and Harold Prime will continue to adventure through time to try and save Crackers and Sulu.]]
* BetterThanABareBulb
* BilingualBonus: While Wedgie Woman is announcing her new regime, her hair-tentacle-hands are using [[UsefulNotes/SignedLanguage ASL]] to spell out "WEDGIE POWER".
* BittersweetEnding: [[spoiler: The GrandFinale ''Sensational Saga of Sir Stinks-A-Lot'' ends with Captain Underpants permanently reverting back into Mr. Krupp, while Yesterday George and Yesterday Harold decide to retire the Captain Underpants comics (meaning that the world will likely forget him). However,The Yesterday pair end up making a Dog Man comic instead, and are implied to be the ones who grow up to be the ones who get married. This means that Yesterday George and Harold get to live relatively normal lives while the original pair continue to go on awesome new adventures (first trying to rescue Crackers and Sulu), fulfilling both their callings at the same time.]]
* BizarroUniverse: George and Harold end up in one in ''Preposterous Plight of the Purple Potty People''. The good news is that the entire school staff are nice to students and the "villains" are nice guys performing community service. The bad news is that George and Harold are evil--and then there's [[EvilCounterpart Captain Blunderpants]].
* BlackBeadEyes: Every single character.
* BlackBestFriend: George to Harold, in the technical sense. The trope is actually averted since their personalities are almost identical, and George is more often than not the leader in their schemes. It's also worth noting that, in the OncePerEpisode introductions, they're always described by their exact appearances, but ''never'' as "the black one/the white one."
* BreakingTheFourthWall: All the time.
** "A huge cloud of mist filled the air, covering everything in sight, and making these two pages incredibly easy to draw."
* BrickJoke: Several examples:
** In one of the later books, George and Harold tell everyone how to make a squishy prank, which is to put ketchup packets under a toilet seat. Half way through the book, Melvin sits on a toilet and gets ketchup on his legs.
** "I was at the shoe store ordering a cheeseburger." (ItMakesSenseInContext)
* BrilliantButLazy: George and Harold have lots and lots of potential and are very smart boys, but are horribly lazy and tend to use their potential in the form of pranks and comic books rather than in their schoolwork.
* BriarPatching: Captain Underpants does this to Melvin in Book 7.
* TheBully[=/=]JerkJock: Mr. Krupp's nephew, Kipper Krupp, and his gang in book nine. They're members of the school wrestling team and extort kindergardeners for lunch money because they can.
* TheCameo: In one of George and Harold's comic books that were clearly a TakeThat on the school's tattletale Melvin, among the people going to jail were Super Diaper Baby and Diaper Dog from the spin-off titles. They show up again when Captain Underpants releases everyone from their cells.
* CannotSpitItOut: In ''the Wrath of the Wicked Wedgie Woman'', George and Harold prank Mr. Krupp by changing an apology card he ordered them to make for Ms. Ribble that she reads out loud into a ''marriage proposal'' to her for him. He is so shocked and stupefied when she reads it out, ''an actual marriage happens'' until Ms. Ribble breaks it off just before the vows happen, ''and only then'' does Mr. Krupp say he didn't want to marry her either, the entire thing happening due to George and Harold tricking them.
* CaptainSuperhero: The titular character, of course!
* CardCarryingVillain: Evil George and Harold from the mirror universe in Book 8, who open their comic with the line "Once upon a time, there were two evil children named George and Harold."
-->'''Evil George:''' I am bad.
-->'''Evil Harold:''' I am bad as well.
* CassandraTruth: [[OnceAnEpisode Once a book,]] a little boy tells his oblivious mother about what's happening and she brushes him off.
** In book ten, it's the mother who tells the kid that she saw something odd, and he too swears it off.
* CatchPhrase:
** "Tra la LAAAAAA!"
** "Oh no!"
** "HereWeGoAgain!"
* CerebusSyndrome: Surprisingly. After the first five books, the series gets slowly more continuity-intensive, and a bit DarkerAndEdgier too.
* CharacterNameAndTheNounPhrase: The title of every single book except for the first one.
* ChekhovsGag: Squishies. First used as a seemingly throwaway gag in the sixth book, and later makes a surprise reappearance in the seventh book, [[spoiler: cleverly used by Captain Underpants to dispatch Trixie and Frankenbooger at the same time.]]
* ChekhovsGun:
** The 3-D Hypno-Ring was originally just a(n extremely silly) plot device in ''The Adventures of Captain Underpants'' and was only brought up in passing in most of the sequels, if it was mentioned at all. In ''Wrath of the Wicked Wedgie Woman'', however, the ring made a full reappearance and the trouble using it causes became a plot point.
** In the first book, George and Harold decide to take a fake dog poop with them when go to search for the hypnotized Mr. Krupp. Later, George uses the poop to distract Dr. Diaper.
** Professor Poopypants'[=/=]Tippy Tinkletrousers' various inventions from book 4 become this in books 9 and 10, and are ultimately directly or indirectly responsible for the ice age, the extinction of the dinosaurs, and the ''Big Bang'' itself.[[note]]"Indirectly," in that the Goosey-Grow 4000 turns an ordinary thermonuclear bomb and enlarges it to galaxy-destroying levels.[[/note]]
** Dog Man, the first comic that Harold and George made together eventually becomes [[spoiler:a graphic novel by Harold and George as adults]]. Book 12 ends with Harold and George deciding to move on from Captain Underpants and make more comics about the character.
* ClarkKenting: The Captain sports a BaldOfAwesome, while Mr. Krupp seems to be wearing a DodgyToupee.
* CliffhangerCopOut: Tippy Twinkletrousers was apparently killed at the end of Book 9 after the giant zombi-fied Harold squished him underfoot. Book 10 reveals the former left out a scene between, in which it turns out Harold was so incredibly slow Tippy had time to scream three times, go shopping, then buy a giant novelty ketchup pack and place it beneath the foot.
* ComicBooksAreReal
* CoolAndUnusualPunishment: Professor Poopypants tries to get his revenge by forcing everyone to have a silly-sounding name that uses the same pattern as his name.
* ContinuityNod:
** Dr. Diaper is arrested (offscreen) at the end of book one. In book four when Tippy Tinkletrousers is in jail, you can see him one of the windows at the jail.
** At the end of Book two, George and Harold tell the robot they created to take the dead toilets out to Uranus. Then in book 4 if you notice a newspaper, they're apparently found on Uranus. This once again shows up in Book 7, when Major Tomski and his crew make an expedition to Uranus and find the dead toilets and the Robo-Plunger. Finally, Book 11 opens with the softball from Book 5 arriving at Uranus and decapitating the Robo-Plunger, [[SealedEvilInACan freeing the Turbo Toilet 2000]].
* ContrivedCoincidence: This is how Captain Underpants frequently sources his red with black dots curtain-capes:
** Most of the time, they come from Mr. Krupp's office in the school.
** In Book 6, George, Harold and Krupp were hiding behind one of these curtains when George turned Krupp into Captain Underpants. (The coincidence was lampshaded here)
** In Book 9, the Everything Except Fabric Softener store happens to be selling superhero capes at 100% off, as part of their 'Lazy Storytelling' sale.
** In Book 10, Krupp was holding a box of curtains when he was accidentally sent back in time with George and Harold.
* CrapsackWorld: The [[spoiler: BadFuture that Tippy Tinkletrousers unintentionally created]].
* CreateYourOwnVillain: With the notable exception of the first book's antagonist, every subsequent major villain has either had their plans facilitation or can contribute their descent into evil to George and Harold's callous actions.
* CurbStompBattle: Captain Underpants (who, at this point, has no superpowers) versus the Turbo Toilet 2000 goes about as well as you'd expect. Another one happens a few chapters later when the Robo-Plunger shows up, this time with Turbo Toilet on the receiving end.
* DeanBitterman: Mr. Krupp.
* DecemberDecemberRomance: George's grandmother and Harold's grandfather hook up around the end of ''the Preposterous Plight of the Purple Potty People''. George and Harold were suitably {{Squick}}ed from being present to them passionately kissing before going off to find a restaurant for a date.
* DetonationMoon: Dr. Diaper's plot. [[spoiler:The new timeline created in Book 9 shows an aversion to NoEndorHolocaust, with the remains of the destroyed moon scattered across the ruined landscape.]]
* DisneyDeath: Parodied when George and Harold nearly fall to their doom due to Captain Underpants using toilet paper to escape an alien spaceship. Also doubles as a DisneyVillainDeath.
* DoubleEntendre: The title of the third book could be referencing both the fact that the aliens are evil, and their ...appendages.
* DownerEnding: [[spoiler:''Terrifying Return of Tippy Tinkletrousers''. AND HOW!]]
** [[spoiler: Luckily, there is some TimeyWimeyBall shennanigans involved as the Tippy that appeared before George and Harold were sentenced to juvie was from the future, and the story focused on what happened when Tippy ''didn't'' appear before then.]]
* [[invoked]]DudeNotFunny: After [[spoiler:Professor Poopypants is defeated]] in ''Captain Underpants and the Perilous Plot of Professor Poopypants'', George exclaims "Let's all give Captain Underpants a big hand!" Harold, whose hand was accidentally enlarged a few chapters prior, glares at George who apologizes.
* DudeWheresMyRespect: In Book 11, Melvin becomes a superhero to fight back against the Turbo Toilet 2000. He soon finds himself doing less of his lab work more of helping people out with trivial needs. He finally gets fed up with this and brings George and Harold back from the future to deal with the Turbo Toilet 2000.
* EarlyInstallmentWeirdness: In the first two books, the OnceAnEpisode Incredibly Graphic Violence Chapter(s) were called the Extremely Graphic Violence Chapter(s). The first three books each had a chapter titled "Busted" as well.
* EveryEpisodeEnding: The first five books end with everything going back to normal, until someone snaps their fingers and Mr. Krupp runs off to become Captain Underpants, with George and Harold running after him, yelling "Oh no!" and "HereWeGoAgain!" The later books end with {{Sequel Hook}}s instead.
* EvilCounterpart: George and Harold have three sets of EvilCounterpart[=s=]--Robo-George and the Harold 2000, created by Wedgie Woman in Book 5, Evil George and Evil Harold from the mirror universe in Book 8, and their future adult selves who are SadistTeacher[=s=] working for Mr. Krupp in Book 10.
* EvilMeScaresMe: George and Harold.
* EverythingsBetterWithDinosaurs: Crackers the pterodactyl (who's actually a Quetzalcoatlus).
* ExactlyWhatItSaysOnTheTin: The book titles and villain names in general, probably as an AffectionateParody.
** To name two example, the twenty-third chapter of the third book and the twenty-second chapter of the fourth book are respectively called "The Twenty-Third Chapter" and "The Twenty-Second Chapter".
* ExpendableAlternateUniverse: The premise of Book 12 relies on alterate Earth populated with smart people getting destroyed (granted, it was their own fault, but still...).
* {{Expy}}: In universe example; the aliens seen in George and Harold's "The Adventures of Great-Granny Girdle and Boxer Boy" during the events of Book 8 are clearly based on Zork, Klax, and Jennifer from the third book.
* EyeGlasses: Melvin. And his family.
* FamilyUnfriendlyDeath: [[spoiler:Tippy being squished to death by a giant zombie nerd Harold at the conclusion to ''Terrifying Return of Tippy Tinkletrousers''. The narrator even describes what's left of him as a "[[{{Squick}} red squishy stain]]". This was lampshaded in the beginning of the next book, of course.]]
** {{Subverted|Trope}}: [[spoiler:The zombie nerds actually squashed a pack of ketchup, as they were too slow to actually crush Tippy.]]
* FantasticAesop: "But what George and Harold forgot was the ''other'' moral, that is, never, ever, '''EVER''' hypnotize your principal. Because if you do, your life may go from bad to worse at the snap of a finger!"
* FantasticNamingConvention: Played with in the novel ''Captain Underpants and the Perilous Plot of Professor Poopypants''. The antagonist comes from a country named New Swissland, where everyone has a silly name. His is Professor Pippy Pee-Pee Poopypants. He later changes it to...Tippy T. Tinkletrousers, naturally solving nothing for him.
* FatBastard: Mr. Krupp.
** And also, Ms. Ribble.
* FMinusMinus: In the fifth book, Ms. Ribble, infuriated with George and Harold's prank that nearly got her married to Mr. Krupp, gives them both "G" grades, a grade specially made just for them. (Unfortunately, the joke is lost on some British readers nowadays, as it is actually possible to get a G grade at GCSE.)
* FlyingBrick: Captain Underpants.
* FourFingeredHands: Everyone.
* FutureMeScaresMe: At one point in the 10th book, George and Harold resolve to start taking their lives more seriously. Later, they end up traveling to the future that by following this resolution, they have grown up to [[AndThenJohnWasAZombie become sadistic teachers]]. They are able to prevent this by breaking the resolution.
* GeorgeLucasAlteredVersion: So far, the first four books are reprinted in color.
* GettingCrapPastTheRadar: Both averted and lampshaded. In "Attack of the Talking Toilets" George and Harold get the idea to create a giant urinal called "The Urinator" to destroy the evil toilets. However, they quickly scrap the idea after deciding that they would never get away with that in a children's book. [[note]]According to Pilkey, this was an exact transcript between himself and his girlfriend while he was writing the book. He'd intended for the destroyer of the toilets to be called "The Urinator", but she talked him out of it for the same reasons.[[/note]] Also in the Alternate Universe, a sign in the background shows a book called 'Mommy has Two Heathers', which is a spin on the book 'Heather HasTwoMommies' about lesbianism.
** In ''The Wrath of the Wicked Wedgie Woman'', Harold says:
-->'''Harold:''' If he believes that spray starch will save him, then it probably will. I think it's called the Placenta Effect.
*** The next chapter is then called "The Placenta Effect."
** In book nine Little George messes up a sign to get revenge on the guy at the gas station bullying Harold. The sign says " Free Brake Inspection", and George takes the "k" and "e" off of brake, making the sign say, "Free ''Bra'' Inspection. A lot of women who read the book were offended by this sexual innuendo.
** Book 12 plays HasTwoMommies straight, showing that future Harold married a man and has two kids with him.
** [[spoiler:Half-bionic hamster, half-pterodactyl creatures.]] The less said, the better.
* GenreSavvy: Both George and Harold know that they exist in a series of books, and love lampshading tropes.
-->''George and Harold are tied up, with a candle burning through a rope that when burnt through will launch an axe at them''.
-->'''George:''' Well, it looks like this is the end.
-->'''Harold:''' Maybe not. Maybe the blade will fall and slice through our ropes and not harm us at all.
-->'''George:''' I doubt it. That kind of thing only happens in really lame adventure stories.
-->''Suddenly the blade fell and sliced through the ropes, not harming George or Harold at all. The two boys looked at each other and decided it was best not to comment on the situation''.
* GoMadFromTheRevelation: The entire school staff undergoes this in Book 11 when George and Harold try to sneak into the school while their time-travel duplicates were in attendance, only to be caught. Mr. Krupp ends up being committed.
* GoryDeadlyOverkillTitleOfFatalDeath: Book 3.
* GoneHorriblyRight: The whole premise. George and Harold hypnotized their principal to believe he was an underwear-themed superhero. It worked too well.
** In the third book, George reluctantly gives Captain Underpants "Extra-Strength Superpower Juice" to save his life before he could get eaten. Now, not only does he believe he's Captain Underpants, ''he has superpowers''.
* GoodParents: George's parents and Harold's mother come off as this to their children.
* TheGoodCaptain
* {{Gorn}}: Parodied by the Flip-o-Rama chapters, which self-describe the (clearly bloodless) fights consisting of two related panels which the reader flips between quickly to make it look animated as "incredibly graphic violence".
* GrandFinale: ''Captain Underpants and the Sensational Saga of Sir Stinks-a-Lot'' ends with [[spoiler:Mr. Krupp's Captain Underpants identity and powers erased, George and Harold going on time traveling adventures, and Yesterday George and Yesterday Harold moving on from making Captain Underpants comics and returning to their first creation, Dog Man.]]
* GrossOutShow: {{Lampshade|Hanging}}d by issuing a warning prior to a nauseating starting bit of a chapter inside the Bionic Booger Boy, and having George [[MediumAwareness yell at the narrator for his disgusting descriptions right after it]].
* HeelFaceBrainwashing: Mr. Krupp [[spoiler:and Ms. Ribble]].
* HereWeGoAgain: The TropeCodifier. All the books in the regular series end with George screaming "Oh no!" and Harold screaming this trope's name.
* HeroOfAnotherStory: Old George and Old Harold getting back the Hamsterdactyls at the end of ''Captain Underpants and the Sensational Saga of Sir Stinks-a-Lot''.
* HeterosexualLifePartners: George and Harold. [[spoiler:Though Harold isn't heterosexual]].
* HighOnCatnip: Occurs in ''Super Diaper Baby 2: The Invasion of the Potty Snatchers''.
* HoistByHisOwnPetard: Several examples in ''Wrath of the Wicked Wedgie Woman'':
** In the comic George and Harold make for Ms. Ribble, she assigns a huge amount of book reports only to get crushed by the pile. When she's rebuilt as Wedgie Woman, she's defeated when her robo-wedgie-claw grabs her own underwear.
** Harold 2000 and Robo-George get beaten up their own rocket arms.
** Happens to the real Ms. Ribble when she's hypnotized into thinking she's Wedgie Woman. That stolen Extra-Strength Spray Starch? [[spoiler:It's actually Hair Remover, and her powers are all in her hair.]]
* HotSkittyOnWailordAction: Implied with [[spoiler:Sulu the Bionic Hamster and Crackers the pterodactyl]] at the end of book 11, and grossly lampshaded by the boys.
-->'''Harold:''' "But that doesn't make sense!"
* HypnoFool: The result of George and Harold not reading the directions, and the rationale behind the books after the first one.
* HypocriticalHumor:
** When Ms. Ribble says she could never marry Mr. Krupp because of his stupid-looking nose, the scene is drawn in close-up to emphasize the fact that their noses are drawn ''identically.''
** George and Harold read their evil counterparts' book on Captain Blunderpants (which has great handwriting plus no words are misspelled), then they say that [[BlatantLies the handwriting is bad and that words were spelled wrong.]] And we all know how awful their penmanship and spelling are...
** In the final book, George gets excited when learning he became an author when he grew up. Harold tells him to have self-control, but when he hears he became an illustrator, Harold also gets excited despite having told George not to. George [[LampshadeHanging lampshades]] this.
** Mr. Meaner constantly makes fun of the overweight kids even though he is fat too.
* InformedJudaism: We learn that Mr. Krupp is Jewish at his wedding thanks to there being a rabbi there. Of course, he's only there so that he can tell George and Harold not to pull any tricks, [[{{Feghoot}} leading to]]:
--> [[{{Memes/Advertising}} Silly rabbi, tricks are for kids!]]
* InsufferableGenius: Melvin Sneedly.
* IResembleThatRemark: On a meta level. The books are written to make kids laugh, while frequently criticizing teachers and other authority figures for being too strict and not letting kids have fun. Teachers and parents responded by banning the books in many schools for having inappropriate humor and supposedly teaching kids to disobey authority figures.
* {{Irony}}: Oh so much. Especially in ''Wrath of the Wicked Wedgie Woman'' where Harold and George head to a newly-opened store to buy fabric softener to help Captain Underpants... only to find the store literally sells everything '''except''' fabric softener.
* {{Jerkass}}: Melvin and Mr. Krupp (when not in Captain Underpants mode).
* JerkWithAHeartOfJerk: Tippy. Once he saves Captain Underpants from disappearing, he goes back to being evil.
* KidsAreCruel: In book 4, when Professor Poopypants shows up as the new science teacher and introduces himself, the whole 4th grade class laughs at him.
* KilledOffForReal:
** [[spoiler:Zorx, Klax, and Jennifer were in their ship when it exploded.]]
** [[spoiler:Sulu, Crackers and Tippy Tinkletrousers]] die at the end of Book 10. [[http://web.archive.org/web/20041109024902/http://www.pilkey.com/nextbook.php We were warned.]]
* KryptoniteFactor[=/=]PlaceboEffect[=/=]WeaksauceWeakness: Captain Underpants loses his power when sprayed with spray starch. At least, he ''thinks'' he does, because that was what George and Harold wrote in their comic. Played straight, as Captain Underpants reverts to Mr. Krupp with a little water. Tippy even lampshades how easy this weakness is to exploit.
* LampshadeHanging: [[BetterThanABareBulb Everywhere.]]
* LaserGuidedKarma: Professor Poopypants attempts to give everyone this for laughing at his name, by forcing them to change their names to silly-sounding ones with similar patterns.
* LeadIn: Several of the books often have a mini-plot that eventually kicks off the major events of the book, preceded by the line "But before I can tell you this story, I have to tell you this one..." In the case of the ninth and tenth books, the ninth book ends up being a book-long Lead In to the tenth book.
* LongTitle: ''Captain Underpants and the Invasion of the Incredibly Naughty Cafeteria Ladies from Outer Space (and the Subsequent Assault of the Equally Evil Lunchroom Zombie Nerds)''. Lampshaded once by George when he points out that it had an "annoyingly long title".
* LoopholeAbuse: Inverted. The Jerome Horwitz "Big Book o' Rules" has rules about '''EVERYTHING''', including kicking a softball into outer space, students turning into giant flying robots, etc.
* LovableRogue: George and Harold.
* LuxuryPrisonSuite: Although not intended as such in-universe, George and Harold find that they don't mind being in juvenile hall in Book 10, because it's [[TakeThat almost exactly like their old elementary school, except with library books, a music teacher, and an art teacher.]]
* MadnessMantra: Mr. Krupp has a tendency to say "B-b-bubba bobba hob hob hobo wah wah!" whenever he comes across something {{mind screw}}y.
* ManchurianAgent: Mr. Krupp becomes Captain Underpants when he hears fingers snapping, and returns to normal when water is poured on his head.
* MediumAwareness: Oh my god, so much.
* MergingMistake: In ''The Big Bad Battle of the Bionic Booger Boy'', Melvin attempts to fuse himself with an advanced robot of his own making, intending to turn himself into a bionic super-boy. But just as the fusion process is commencing, Melvin's cat allergies are triggered and he sneezes boogers out his nose, causing them to be fused as well and turning him into the Bionic Booger Boy.
* MirrorUniverse: "The Preposterous Plight Of The Purple Potty People" has one, where the mean teachers (and the villains) are nice, George and Harold are evil, and Captain Underpants is the evil Captain Blunderpants.
* MixAndMatchCritters: From ''The Tyrannical Retaliation of the Turbo-Toilet 2000,'' there's Tony, Orlando, and Dawn, [[spoiler:the hamsterdactyl offspring of Sulu the Bionic Hamster and Crackers the pterodactyl.]]
* MyFutureSelfAndMe: Abused all over the place in books 10, 11, and 12, which include various characters traveling through time, meeting their past/future selves, and then teaming up with and/or betraying themselves in various ways.
* MyGodWhatHaveIDone: [[spoiler:Tippy Tinkletrousers has this reaction when he realises he essentially destroyed the timeline in Book 9.]]
* MyGrandmaCanDoBetterThanYou: Mr. Meaner says this at one point.
-->"My grandma can run faster than you guys!"
* NerdGlasses: Melvin Sneedly, of course.
* NiceJobFixingItVillain: [[spoiler:Near the end of book 9, Tippy Tinkletrousers [[StableTimeLoop prevented the creation of Captain Underpants]].]]
* NoFourthWall: "Where were you in chapter fifteen when we needed you?"
** "[[CrowningMomentOfFunny I was at the shoe store ordering a cheeseburger.]]" [[note]][[BrickJoke This is one of the things that a previous chapter recommends you do if you don't want to see the]] [[BlatantLies "incredibly graphic violence" it contains.]][[/note]]
* NoodleIncident: In Book 6, in an attempt to complete Ms. Ribble's assignment, Stephanie Yarkoff and Jessica Gordon attempt to demonstrate how to cook lasagna using a toaster. The next scene cuts to firemen leaving the school.
** In the first book, Mr. Krupp reminds George and Harold of their previous pranks, such as putting dissected frogs in the Jell-O salad at the parent-teacher banquet, making it snow in the cafeteria, and rigging all the intercoms to play "Weird Al" Yankovic songs full blast for six hours straight.
* NoseNuggets: Bionic Booger Boy.
* NonHumanSidekick: Sulu (a bionic hamster) and Crackers (a pterodactyl) in books 6-10 and 7-10 respectively, and Dawn, Orlando, and Tony (hybrids between a bionic hamster and a pterodactyl, created because Crackers and Sulu mated) in book 11 and onwards.
* OhCrap: George and Harold, whenever someone snaps their fingers and Mr. Krupp's nearby.
* OnceAnEpisode: Indulged and occasionally played with by changing the pattern a bit.
** Typically the books introduce George and Harold at the beginning. "George is the one with the tie and flat-top. Harold is the one with the striped shirt and bad haircut. Remember that now." Parodied in the kids' graphic novels: each one has a panel introducing two characters in the same fashion with one of the two saying, "Remember that now."
*** Also parodied in the fourth book, in which after Professor Poopypants changes everyone's names, the following chapter begins just like the first one, only calling George and Harold by their new names.
** Also in George and Harold's comic books, when the MonsterOfTheWeek begins its rampage, a kid shows up to announce what terrible things just happened. An adult will show concern for [[ArsonMurderAndJaywalking the less important one]], such as knocking over a tray of cupcakes. Also, the more important incident always seems to involve the gym teacher.
--->'''Kids:''' ''Help! The Tattle-Tron 2000 just ran across the soccer field and squished the gym teacher!''
--->'''Prinsiple:''' ''OH NO! We just planted that grass!''
** Every book includes the line "But before I tell you that story, I have to tell you this one."
** There is always a chapter called "To Make A Long Story-Short." One book had a chapter called "To Make a Longer Story Even Shorter."
** There's always a "Flip-O-Rama" section for the action sequences. Usually with someone telling the reader not to do it and that they will be punished if they do.
** Whenever a ridiculous suggestion comes up, a character will almost always say something along the lines of, "That can only happen in dumb children's books." Then they try the suggestion out anyway and it works!
** Somehow, somewhere, a sign will always get its letters rearranged or knocked off to spell something ridiculous.
** Somewhere in each book, the reader will be told to do some silly thing, usually involving making your own sound effects. At the back of each book, Harold and George apologize for potentially getting the reader in trouble for following this instruction, and offer to send them "something fun" to make up for it.
* OneParagraphChapter: A RunningGag in the books is a chapter consisting only of one two- to four-word sentence confirming that the sequence of events that needed to happen, as explained at the end of the previous chapter, happened.
* OnlySaneMan: George, occasionally. And Harold is a bit more sensible than George, due that he is a year older than him.
* OverlyLongScream: In the beginning of Book 10, when Tippy Tinkletrousers was about to be stepped on, he screamed in terror. And screamed... and screamed... and checked his watch and screamed some more.
* PageTurnSurprise: The end of Book 9 expresses some EndOfSeriesAwareness and says "There are no more Captain Underpants books..." The next page is nothing but [[spoiler:a silent two-page spread of SceneryGorn]]. The page after ''that'', however, is a teaser for the [[BlatantLies actual final book]], accompanied with the text, "...except for ''this'' one:"
* ParentsAsPeople: Melvin's parents are shown to be too busy to spend time with their son. Melvin does, however, show to still love them. This is one of his redeeming qualities.
* PaintingTheMedium: When George and Harold tricked the cafeteria ladies into making a baking-soda-and-vinegar explosion, the resulting tidal wave of foam [[CameraAbuse obscured most of the text on the page]]; the reader is prompted to make their own special effects for the explosion by shaking the book and yelling '''"KABLOOOOOOSH!"''' The back of the book even has an apology and address for you to send a letter to if you got in trouble for yelling that, with the promise that "we'll send you something fun!" [[note]]If you wrote in, they sent you a newsletter called ''[[ExactWords Something Fun]]''.[[/note]]
* PersonAsVerb: In Book 9, George saved Harold from the bullies by taking off his tie and proceeding to "Franchise/IndianaJones" them (I.E. [[WhipItGood whip their butts]]).
* PleaseIWillDoAnything: Said in the second book.
* PowerUpFood: Mr. Krupp got his FlyingBrick powers after drinking some "Extra Strength Super Power Juice" stored in an ''alien milk carton.''
** Subverted in ''The All-New Captain Underpants Extra-Crunchy Book o' Fun 2''[='=]s "The Night of the Terror of the Revenge of the Curse of the Bride of Hairy Potty" -- when Captain Underpants finds himself on the receiving end of a CurbstompBattle, he pulls out a [[ComicStrip/{{Popeye}} can of spinnach]], [[BreakingTheFourthWall only for the Potties to tell him that he's in the wrong cartoon]].
* PunnyName: The school teachers and staff - Benny Krupp (bankrupt), Ms. Edith Anthrope (Eat it and throw up and misanthrope), Ms. Tara Ribble (miserable and terrible), Mrs. [=DePoint=] (misses the point), Miss Creant (miscreant), Mr. Rected (misdirected), Mr. Morty Fyde (mystified and mortified), Miss Singerbrains (missing her brains), Ms. Anita Calculator (miscalculator, I need a calculator), Mr. Meaner (misdemeanor), Miss Labler (mislabeler), Ms. Guided (misguided), Miss Fitt (misfit), Miss Zurry (misery), and Mr. Rustworthy (mistrustworthy).
* RealityEnsues:
** Just about every moment when the teachers pick on George & Harold and the other students at Jerome Horwitz Elementary. The moral? Teachers can be just as immature as the students and can even have worse attitudes than school bullies.
** In book 9, when George an Harold are too exhausted to attend school due to them hardly getting any sleep (they are forced to attend due to complaints from their parents about truancy reports from the school), they plan on taking a quick nap. This resulted in them sleeping until 4pm.
* RivalTurnedEvil: Melvin in the sixth and seventh books.
* RealLifeWritesThePlot: The large gap in release between ''Purple Potty People'' and ''Terrifying Return'' is because Dav Pilkey took a hiatus to care for his ailing father.
* RealMenWearPink: At the end of the first book, the school football team changes the team's name to the [[Series/BarneyAndFriends Purple Dragon Sing-Along Friends]] after a video they saw. Fans were stated to have disliked it, but no one actually argued with the team in front of their faces - for obvious reasons.
--> Who would want to argue with a bunch of linebackers?
* RewritingReality: In ''Wrath of the Wicked Wedgie Woman'', Captain Underpants falls to the effects of 'spray starch'...because [[PlaceboEffect that was what was in George and Harold's latest comic book]]. Later, to cure him, they write another comic telling him he can be freed from it by summoning the power of 'Underpanty World'. It works.
* RobotMe: In ''Wrath of the Wicked Wedgie Woman'', the titular antagonist builds evil robot copies of George and Harold: Robo-George and Harold 2000.
* RuleOfFunny: The series' name makes it perfectly obvious.
* SadistTeacher / ChildHater: Pretty much the whole staff of Jerome Horwitz Elementary School. With teachers like that, who needs bullies? However, [[spoiler:in the fifth book, George and Harold turn Ms. Ribble into a subversion of this via HeelFaceBrainwashing. Also, book nine reveals that Harold's father walked out on the family when he was six, and Harold created the Captain Underpants comics as a coping mechanism. Mr. Krupp in his Captain Underpants identity is a kind of BumblingDad ParentalSubstitute for both of the boys, but particularly Harold.]]
* SanDimasTime: The fifth and tenth books play this one completely straight. The entire plot of the tenth book depends upon at least ''three'' nested time loops [[spoiler: resulting in the extinction of the dinosaurs, the Ice Age, and the ''creation of the universe'' respectively!]]
* ScareEmStraight: [[spoiler: In order to stop Kipper Krupp and his gang from bullying the kindergardeners, George and Harold staged an elaborate prank about a ghost called Wedgie Magee. This results in Kipper and his gang [[HeelFaceTurn turning over a new leaf]] and allowing the kindergardeners to bully them in retribution.]]
* SequelHook: Every book after the first five:
** ''Bionic Booger Boy Part 1: Nasty Nostril Nuggets'': Melvin and Mr. Krupp have their minds swapped, and the Robo-Boogers destroy the Combine-O-Tron 2000 and chase everyone.
** ''Bionic Booger Boy Part 2: Ridiculous Robo-Boogers'': George and Harold attempt to travel in time for the second day in a row.
** ''Purple Potty People'': Tippy Tinkletrousers returns seeking revenge.
** ''Tippy Tinkletrousers'': [[spoiler:Tippy apparently dies.]]
** ''Radioactive Robo-Boxers'': [[spoiler:Melvin Sneedly returns to bring the gang back to the present. The next book revealed he did this so George and Harold could deal with the Turbo Toilet 2000.]]
** ''Retaliation of the Turbo Toilet 2000'': Lampshaded big time. [[spoiler:While the Turbo Toilet 2000 was permanently stopped, there are still two Georges and Harolds as a result of time travel shenanigans, the town is in ruins from the rampage, the mutant babies of Sulu and Crackers have hatched and think the boys are their parents and most if not all the teachers of their school have been sent to jail and or the loony bin.]]
--->"I guess there ''are'' a lot of loose ends in this story."\\
"Uh-oh. That can only mean one thing!"\\
"What?"\\
"Another ''SEQUEL!!''"
* SeriesFauxnale: The 12th book, Sir-Stinks-Alot can be considered this. On the one hand, [[spoiler: Krupp appears to have been depowered and unhypnotized for good while Yesterday George and Harold retire the Captain Underpants series and we know they will grow up to become successful and good adults.]]. On the other hand, [[spoiler: the original George and Harold now have a time machine and are intent to try rescue Crackers and Sulu leaving the series open-ended for a sequel.]]
** There's also this messege from [[WordOfGod Dav Pilkey]]
---> ''Dav Pilkey:'' Even though I have stated that the next book, Captain Underpants #12 will be the LAST Captain Underpants book, you probably shouldn't believe me. I wouldn't.
* SeverelySpecializedStore: Inverted in ''Captain Underpants and the Wrath of the Wicked Wedgie Woman'': To help Captain Underpants regain his powers, George and Harold need to get some fabric softener to counteract the spray starch that took them away. They run to a new store that opened nearby, which turns out to be "[[ExactlyWhatItSaysOnTheTin Everything BUT Fabric Softener.]]"
* ShoutOut:
** Jerome Horwitz Elementary School, named after Curly of Film/TheThreeStooges.
** George and Harold are seen watching Film/{{Gamera}} movies in their treehouse in one book.
** The books are full of Shout Outs to Franchise/{{Superman}}, right down to the origin story.
** In their retcon comic about Captain Underpants' origin story, the Wedgie Warlords fly in a ship that looks like [[Franchise/StarTrek the NCC-1701 made out of Spray Starch cans.]]
** In the comic book about Captain Underpants fighting Wedgie Woman, after [[SadistTeacher a mountain of homework she assigned]] [[HoistByTheirOwnPetard falls on top of her]], the children proclaim that "[[Film/WizardOfOz she's really most sincerely dead.]]" A doctor comes along and says "[[Series/TheSixMillionDollarMan We can make her better than she was before, faster, stronger, eviler...]]"
** The children at Ms. Ribble's retirement party get ordered to sing a song about how [[Theatre/ByeByeBirdie they love Ms. Ribble, oh yes, they do]].
** When a rabbi asks George and Harold if they have any tricks planned during a wedding he must preside, George answers, "[[Advertising/TrixRabbit Silly rabbi, tricks are for kids!]]"
** Two later books feature a [[Series/DoctorWho portable toilet time machine]].
** Chapter 18 of ''Captain Underpants and the Attack of the Talking Toilets'' is titled "[[Literature/HaroldAndThePurpleCrayon Harold and the Purple Ball-point Pen]]".
** The [[spoiler:hamsterdactyls]] are named "Tony," "Orlando," and "Dawn," after the American pop music group from TheSeventies.
** One of George and Harold's pranks apparently involved making the school intercoms play Music/WeirdAlYankovic songs.
** Midway through book eleven Melvin has a celebration parade where they also play nothing but "Weird Al" songs.
* ShrinkRay: the Shrinky-Pig 2000, invented by Professor Poopypants. He also invented the Goosy-Grow 4000, the inverse.
* SignsOfDisrepair: Every book opens with George and Harold rearranging the letters around on a sign to say something silly. The boys also use this trope as a running gag in their comic books.
* SomethingCompletelyDifferent: In Book 7, instead of the usual "Incredibly Graphic Violence Chapter", there's a Flip-O-Rama chapter dedicated to Captain Underpants doing "the Underpants Dance".
* SpaceWhaleAesop: The moral of ''Professor Poopypants'' is: Don't make fun of people's names, or they'll shrink you to the size of a bug and make YOU change your name to something ridiculous to make themselves feel better. Although this could also be interpreted as "Don't make fun of people, because what goes around comes around."
* SpaghettiKiss: Parodied in ''The All-New Captain Underpants Extra-Crunchy Book o' Fun 2''[='=]s "The Night of the Terror of the Revenge of the Curse of the Bride of Hairy Potty", complete with Hairy Potty rolling a urinal cake with his nose.
* SpandexLatexOrLeather: This trope is played with by George and Harold while conceiving the concept of Captain Underpants - as such spandex wearers end up looking like they're in their underwear, they made Captain Underpants' constume ExactlyWhatItSaysOnTheTin.
* SpinOff: Three as of this writing -- ''Super Diaper Baby'', ''Ook and Gluk'', and ''Dog Man''.
* SquareCubeLaw: [[spoiler: Played with in Books 9 and 10 -- in Book 9, the giant zombie nerds appeared to have crushed Tippy Tinkletrousers in the ending. The following book explains how the square cube law works before revealing that the giants were moving slow enough to allow Tippy to fake his death.]]
* StaringKid: A recurring character who always tries to point out the titular superhero's antics to his mom, but she never believes him.
** He and his mother make an appearance in Book 9 [[spoiler:as the people who tell Tippy Tinkletrousers about what happened since he changed the past]].
** They make a cameo in book 10, in which their roles are reversed - the mother is the one who sees something strange, and her son doesn't believe her.
* SparseListOfRules: In the fifth book, the school reveals it has the Big Book O' Rules, with nearly 8000 rules. We only hear two: "Rule 411: Don't kick school property into space", and "Rule 7,734: Don't transform into big, flying robots during afternoon recess." One has to wonder what ''exactly'' happened in the past of Jerome Horwitz Elementary that made them include those.
* SpotlightStealingTitle: Despite Captain Underpants being in the name of every book and usually front and center on the cover, George and Harold are the real protagonists. The most egregious being the cover of ''Preposterous Plight of the Purple Potty People'' -- Captain Underpants is front and center on the cover and yet only appears in the book itself for about 12 pages.
** In the books themselves, ''The Terrifying Revenge of Tippy Twinkletrousers''. Captain Underpants and Tippy Twinkletrousers are important on the cover, and yet 90% of the book focuses on young George and Harold redeeming their school bully.
*** To put it in perspective, the first eight chapters focused on Tippy escaping from jail and discovering Captain Underpants's secret. Then the focus switches to the bully story and Tippy doesn't return until the thirty-first chapter of this thirty-four-chapter book.
* StylisticSuck: George and Harold's comic books look like they were drawn by actual fourth-graders, with messy handwriting and drawings, misspelled words, and issues with spacing.
** Inverted by their [[EvilTwin Evil Twin]]s' in ''Preposterous Plight of the Purple Potty People'', whose comics have clean drawings with proper spelling and neat handwriting. George and Harold see their comics, and comment [[HypocriticalHumor that it looks bad with some misspelled words.]]
** Taken UpToEleven with Kindergardener!George and Harold's comic books. The pictures are even cruder and the words are much larger that they take up so much space.
** In ''The Tyrannical Retaliation of the Turbo Toilet 2000,'' chapters 6 and 7 are illustrated by Timmy Swanson, age four, whose characters resemble misshaped blobs with stick-figure fingers and limbs.
* SuckySchool: See two examples down.
* SuddenlySexuality: [[spoiler:In the last book, it's revealed that Harold is gay]]. Justified in that this is revealed via time travelling to the future, when [[spoiler:George and Harold meet their future selves, along with their future spouses and children. Present!Harold is at an age where he's probably not even ''thinking'' about whether he's gay or straight yet, so it wouldn't have come up in the main timeline]].
* SuperheroesWearTights: Parodied by the titular Captain Underpants, who instead of wearing skin-hugging tights with UnderwearOfPower, is simply unclothed aside from a pair of underpants.
* SuperSerum: Extra Strength Super Power Juice.
* TakeThat: In response to the ''Captain Underpants'' books being [[http://www.ala.org/ala/issuesadvocacy/banned/frequentlychallenged/challengedbydecade/2000_2009/index.cfm constantly challenged]] by self-appointed MoralGuardians, later books depict the school library as being almost completely free of books, with a librarian who discourages readings and posts signs encouraging mindless conformity.
** Furthermore, ''Captain Underpants and the Preposterous Plight of the Purple Potty People'' features a trip to an [[AlternateHistory alternate universe]] where the school library is stocked with books and the librarian encourages creativity and non-conformity.
** [[Series/BarneyAndFriends Boomer the Purple Dragon]]
** In universe example: George and Harold have gerbils being driven into homicidal maniacs because they were being forced to listen to Music/{{Cher}} in one of their comics.
*** In the Spanish prints, Cher was replaced by Julio Iglesias.
** The ''ENTIRE SERIES'' is easily a Take That to the author's teachers, particularly memorable ones like the one who told him to grow up and stop making silly comic books, or the principal who told him he would never make a living as an artist. This is also a large reason for the "death to the gym teacher" RunningGag.
** "Captain Underpants and the Terrifying Return of Tippy Tinkletrousers" enjoys drawing parallels between prison and Elementary School, the primary difference being that prison has better funding.
** The 10th book's first chapter is dedicated to explaining to the child readers why [[StopHavingFunGuys adults are so mean to them]] and why [[NeverMyFault they would rather blame other people or things (like the kids) for problems that are their own fault]].
** The 11th book's second chapter is dedicated to not offending older people (called "grouchy old people", or the "[[FunWithAcronyms GOP]]"), by eliminating words like "poop", and constantly referencing things they like, such as Bob Evans Restaurants, and [[Creator/FoxNewsChannel FOX News]]. The next chapter then goes on to criticize how human evolution led to annoying things like car alarms, leaf blowers and spray-on hair, and how we built dangerous weapons like nuclear warheads then had the codes controlled by politicians.
** The warning before the Flip-O-Rama of the fourth book says, "If you are easily offended, or if you tend to blame all of society's evils on TV shows and cartoon characters, please run to your nearest supermarket and get a life."
* TakeThatUs: ''The Preposterous Plight of the Purple Potty People'''s MirrorUniverse plot, when realized by George and Harold, was remarked by them as something "That's only happens in children's book where the author is clearly running out of ideas."
* TemptingFate: Harold asks "What could be worse then going to jail for the rest of our lives?". Then Tippy Tinkletrousers returns for {{Revenge}} against the world again.
** Not to mention the following chapter is called [[LampshadeHanging The Thing That's Worse Than Going To Jail For The Rest Of Their Lives]].
* ToiletHumor: Pretty much the entire point.
* TrilogyCreep: Parodied by the end of the Eleventh novel, since the Tenth was marketed as the "final book"
--> ''Not another sequel!''
* {{Trope 2000}}: Many machines in this series are named like this.
* UnderwearOfPower: But of course.
* UnfortunateNames: Professor Pippy P. Poopypants, as well as most of the names on the "Name Change-O-Chart."
** At the end of the book, he tries changing his own name as he went to jail. Unfortunately, he choose "Tippy Tinkletrousers", his grandfather's name.
** In Poopypants' home country of New Swissland, ''everyone'' has an Unfortunate Name.
** On a subtler but more disturbing note, Principal [[http://en.wikipedia.org/wiki/Krupp#World_War_II Krupp]].
*** Which is made ironic and somewhat hilarious when you find out that Mr. Krupp is Jewish.
* UnholyGround: The third book, the one with the long title about the lunch ladies, had a very good page image about the hill where they buried the lunch ladies being haunted.
* UnusualChapterNumbers: Book 3 has a Chapter 6½, while Book 5 has a Chapter 14½ and a Chapter 14¾.
* UpToEleven: {{Invoked|Trope}} in the teaser for Book 11: "Captain Underpants goes to '''eleven'''!"
* VillainDecay: Mr. Krupp goes from being a KnightOfCerebus to being an IneffectualSympatheticVillain once George and Harold brainwash him into being Captain Underpants.
* WeaksauceWeakness
** Captain Underpants loses his power whenever someone pours water over his head. Likewise, his evil counterpart turns back to normal when someone snaps their fingers. For the record, this means that the only thing that can remove Captian's powers is a substance that covers seventy percent of the planet's surface, and his counterpart can be defeated by a poetry slam.
-->'''Tippy Tinkletrousers''': You've got to be the ''easiest'' superhero to defeat!
** In book 5, Captain Underpants loses his powers from starch.
* {{Wedgie}}: Captain Underpants uses Wedgie Power in most of his comics.
* WeInterruptThisProgram: Occurs midway through book five. Right when George and Harold are about to hypnotize Ms. Ribble, the chapter is literally interrupted by a news report saying that the Hypno rings have just been recalled because they make a woman do the opposite of what she has been hypnotized into doing.
* WhatCouldPossiblyGoWrong: [[LampshadeHanging ("Every time you say something like that, something bad happens!")]]
* WhatMeasureIsANonHuman: Discussed in [[https://www.youtube.com/watch?v=Z89IqxaSvwo Pilkey's first Flip-o-Rama Workshop]], where Dav mentions how parents would be quick to object if your Flip-o-Rama depicted a human being attacked, and offers making the attacked subject a robot or monster as a quick work-around.
* WhenEldersAttack: '''Geezer Powers - ACTIVATE!!'''
* WholeEpisodeFlashback: ''The Terrifying Return of Tippy Tinkletrousers.''
* WidgetSeries: There are [[http://www.pilkey.com/cusong.php Captain Underpants videos]], and then there's... ''[[http://www.youtube.com/watch?v=eBBFemltv7A this]].'' Very, '''VERY''' Japanese, indeed.
* WoobieDestroyerOfWorlds: Professor Poopypants.
* WorstNewsJudgementEver: The resigning of Jerome Horwitz Elementary School's science teacher somehow becomes the top story in ''US Today''.
* WritingLines
* WrongRestaurant: In one book, the author suggests ordering a cheeseburger at a shoe store. This becomes a BrickJoke later on when Captain Underpants returns after a short absence, and explains that he was at a shoe store, ordering a cheeseburger.
* YouLookLikeYouveSeenAGhost: [[spoiler:Tippy Tinkletrousers says this to the bullies right after (a) the bullies have been scared away by a fake ghost, and (b) Tippy materialises before them.]]
* YouHaveToHaveJews: The later books have a sprinkling of Jewish references and jokes.
** ''Wedgie Woman'' reveals that Mr. Krupp is Jewish when the rabbi who's going to marry him to Ms. Ribble tells George and Harold that he doesn't want any tricks today, to which they reply "Silly rabbi! Tricks are for kids!"
** In ''Bionic Booger Boy, Part 1'', the narrator describes the owner of the tissue factory as "not the brightest bulb on the Hanukkah tree" when he won't stop giving Monster!Melvin tissue, despite them clearly driving him nuts.
* YoungerThanTheyLook: Kipper, Finkstein and Bugg are only sixth graders, but they could easily pass off as high schoolers.
* YourPrincessIsInAnotherCastle: ''Bionic Booger Boy, Part 1'' appears to have a happy ending (taken even further by the chapter name), but it just leads to a SequelHook.
----
!!The Captain Underpants SpinOff titles contain examples of:

* AccidentalMisnaming: A RunningGag throughout "Ook and Gluk" is people saying Chief Goppernopper's name wrong.
* AndNowYouMustMarryMe: Gak Schadowski is forced to marry Gophernopper in ''Ook and Gluk''.
* ArtisticLicensePaleontology: In ''Ook and Gluk'', George and Harold claims that dinosaurs coexisted with humans. However, the message at the beginning of book downplays their claim.
* BadFuture: The future shown in ''Ook and Gluk'' is so polluted and resource-depleted that they use a time machine to mine the prehistoric past.
* BerserkButton: Do ''not'' say Chief Goppernopper's name wrong.
* BlindingBangs: Ook has long stringy hair that obscures his eyes.
* CatsAreMean: Petey in ''The Invasion of the Potty Snatchers''.
* ComicallyMissingThePoint: The origin of ''Super Diaper Baby 2.'' After reading the first Super Diaper Baby comic book, Mr. Krupp yells at George and Harold for writing too many comic books about poop, and gives them a copy of ''Literature/HowTheGrinchStoleChristmas'' (with the last 7 pages ripped out) to give them more ideas. George and Harold agree with him, surprisingly, and decide to write about something else other than poop. They end up writing a comic book about pee.
* CorruptCorporateExecutive: Mr. Goppernopper, who uses time travel to find more forests to raze.
* EpicFail: When Super Diaper Baby is born, the doctor's attempt to give him the "spank of life" somehow ends with him accidentally ''throwing the baby out the window.''
-->'''Mr. Hoskins:''' Look what you did!\\
'''Mrs. Hoskins:''' ''My baby!''\\
'''Doctor:''' Hey, I said I was sorry. Jeez!
* EvenEvilHasStandards: Diaper Dog objects to Deputy Doo-Doo tossing Super Diaper Baby into a nuclear plant.
* ExactWords: The in-universe origin of the Super Diaper Baby comic books. One day, Mr. Krupp decided to punish George and Harold for making mischief by making them write a 100-page essay on "good citizenship", and specifically told them not to write a 100-page Captain Underpants comic book. He did not say anything about not writing a 100-page Super Diaper Baby comic book.
* FlyingBrick: Super Diaper Baby and Diaper Dog.
* GotMeDoingIt: In ''Ook and Gluk'', after Goppernopper's guards say his name wrong for the umpteenth time:
-->'''Goppernopper:''' It's "gobstopper", I mean "Goppernopper" you idiots! Now you've got me doing it!
* HeelFaceTurn: In ''Super Diaper Baby'', Danger Dog changes sides after seeing Deputy Doo-Doo try to murder the titular infant.
* HeyYou: Billy never refers to Diaper Dog by name and instead refers to him as "doggy".
* HulkSpeak: Ook and Gluk, even after seven years of education in the 23rd century.
* ILied: Invoked by Mr. Goppernopper after he gets Ook and Gluk to surrender.
* MeaningfulName: Three guesses to what Super Diaper Baby, Diaper Dog, and Deputy Doo-Doo are.
** Big Chief Goppernopper and Mr. Goppernopper also suffer this in ''The Adventures of Ook and Gluk''.
* NinjaPirateZombieRobot: ''The Adventures of Ook and Gluk, Kung-Fu Cavemen From The Future'' is ExactlyWhatItSaysOnTheTin.
* OldMaster: Master Wong, the kung-fu teacher from ''Ook and Gluk''.
* OlderSidekick: Diaper Dog to Super Diaper Baby.
* PowersAsPrograms: In ''Super Diaper Baby'', Deputy Dangerous steals Captain Underpants' powers and distills it into a liquid, which gets transferred to Danger Dog and Billy when they drink it. The Captain regains his powers later when Super Diaper Baby buys a [[PowerUpFood carton of Super Power Juice]] from Mars.
* PunchClockVillain: Danger Dog, Deputy Dangerous' sidekick in ''Super Diaper Baby'', admits at the beginning that he's not actually evil, but rather just with the Deputy for the Kibbles. Later, the Deputy's attempt to kill Super Diaper Baby causes Danger Dog to have a HeelFaceTurn and save the baby.
* RetGone: In ''Ook and Gluk'', [[spoiler:the BigBad Mr. Goppernopper erases himself when he vaporizes his prehistoric ancestor]].
* RipVanTinkle: The BigBad of ''Invasion of the Potty Snatchers'' is named "Rip Van Tinkle".
* RoguesGalleryTransplant: Petey the cat started out as the sidekick of a villain in ''Super Diaper Baby 2''. He has since shown up as the main villain of the ''Dog Man'' series.
* SanDimasTime: Happens to Ook and Gluk after they spend seven years in the future learning martial arts.
* ShoutOut: All three books so far contain a line referencing the song "Billy, Don't Be a Hero".
** Pilkey has noted on his website that he named the main character of ''Super Diaper Baby'' Billy [[OverlyPrepreparedGag for the sole purpose of referencing the song.]]
** ''Ook and Gluk'' also has homages to the posters for ''Film/TheEmpireStrikesBack'' and ''Franchise/JurassicPark''.
** In ''Super Diaper Baby 2'', Mr. Hoskins attempts to read ''[[Literature/FrogAndToad Mechafrog and Robotoad are Enemies]]'' to Billy.
* StonePunk: A montage shows Chief Gophernopper inventing something useful, and then realizing Ook and Gluk already invented something more powerful than that.
* TakeThat: In the back of ''Ook and Gluk'', there is a section where one can learn "Cavemonics", caveman speak. "I'd like to eat at Applebee's" is translated as "Me go to barf place."
** A further extension on Dav Pilkey's website translates "He's riding on a Segway" as "Hims riding on world's dumbest invention".
* TalkingAnimal: Diaper Dog, even before he gets superpowers.
* TalkingPoo: Deputy Dangerous tries to use an invention called the Danger-Crib 2000 to transfer Super Diaper Baby's powers to him, but Super Diaper Baby's mom pulls him out of the crib at the last second, leaving only a poop-filled diaper in it when Deputy Dangerous activates the machine, accidentally turning himself into "Deputy Doo-Doo".
* ThoseTwoBadGuys: Goppernopper's guards.
* TimeTravelRomance: Ook falls in love with Lin Wong, who is from the future. [[spoiler:They get HappilyMarried at the end and Lin Wong eventually goes back to the prehistoric times.]]
* ToiletHumor: Heavily used in ''Super Diaper Baby'', especially with the BigBad, Deputy Doo-Doo.
* UpgradeArtifact: Deputy Dangerous tries to use a power-sapping crib to steal Super Diaper Baby's powers. [[spoiler:He ends up zapping a bowel movement instead, and turns into Deputy Doo-Doo]].
* UranusIsShowing: Both Deputy Doo-Doo and Rip Van Tinkle get deposited on Uranus. 'nuff said.
-->"Welcome to Uranus (Please don't make fun of our name)"
* VomitIndiscretionShot: In ''Ook and Gluk'', Lily is shown vomiting several times, at one point ''[[NauseaFuel in Mr. Goppernopper's mouth]].''
* WouldntHurtAChild: Diaper Dog draws the line at Deputy Dangerous throwing baby Billy into a nuclear power plant.
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!!ComicBook/DavPilkeyDogMan has it's own page.
->''[[OncePerEpisode Oh]] [[SequelHook no!]]''
->''HereWeGoAgain!''