History WesternAnimation / CaptainUnderpantsTheFirstEpicMovie

** George and Harold first became friends in kindergarten when they laughed over the name "Uranus". [[spoiler:Hearing Professor Poopypants say it in the climax gives their brains the hilarity they need to overpower his brainwashing ray.]]

* AnAesop: It is important to have a sense of humor.

** Downplayed for Melvin, who except for one evil moment in book 7, was normally only a InsufferableGenius but not a villain or evil person by any means and was shown to love his parents. He even became a superhero towards the end of the series and saved George, Harold and Captain Underpants (for self-serving reasons but is still counts). In this movie, he's more than willing to participate in Poopypants scheme for the sake of extra credit and refuses to help George and Harold stop Poopypants.
** Amplified with the Turbo Toilet 2000, who was the largest and most vicious of the Talking Toilets in the books, but is now a non-sentient mecha controlled by Professor Poopypants.

* ArtShift: The comic book sequences are animated in sketchy hand-drawn animation.

** Harold's worrying about what'll happen if Mr. Krupp puts them in separate classes is presented with sock puppets and a little stop-motion.

* BigBad: Professor Poopypants, who in a case of AdaptationalVillainy is a bad guy when he immediately first appears.

* BlankWhiteEyes: Whoever is hit with the anti humor ray gets these.
* {{Bookends}}: The movie's title appears at the beginning (On George and Harold's comic book) ''and'' the end of the film.

* CanonForeigner: Edith the lunch lady is the only original character for the film.

* CompositeCharacter: The Turbo-Toilet 2000 is merged with Professor Poopypants's HumongousMecha from Book 4 as the Professor's primary means of attack.

* AdaptationalEarlyAppearance: Mevlin's debut was in book two when George and Harold encountered him at the Invention Convention. Here, he's introduced before the Invention Convention is.

* AdaptationalDumbass: Melvin doesn't come close to reaching the ImpossibleGenius he was in the books. For example, in the book's version of the Invention Convention, his project was a printer that could ''print 2D images into living, sentient beings''. Here, his various inventions (along with being things that could more reasonably exist) are all stupid and impractical, like a giant binder designed to hold regular-sized binders. His [[CharacterCatchphrase catchphrase]] in this film is also him cluelessly stating "I don't get it."

* AdaptationalVillainy: Instead of being pushed over the edge of madness by George and Harold's cruel comic book, Professor Poopypants is already a villain the moment he becomes a teacher at their school. His backstory reveals he already snapped when [[spoiler:the presenters at the World's Greatest Inventor award ceremony were too busy laughing at his name to give him his well-deserved award]].

** That being said in the book Poopypants became deranged to the point where he attempted murder multiple times and and tried to destroy the galaxy and kill everyone in his final appearance. Here, he merely intends to get rid of laughter and doesn't attempt to murder anyone instead opting to shrink George, Harold and Captain Underpants. He also doesn't get rid of the part of the brain that causes laughter only because humans need it to survive.

* AdaptationNameChange: In the books, the villain was called Pippy Pee Pee Poopypants. Here, however, it's changed to the even more unfortunate Pee Pee Diarrheastein Poopypants Esquire.

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