Captain Underpants and the Terrifying Return of Tippy Tinkletrousers is the 9th book of Captain Underpants.
Plot[]
The story continues where the previous book left off, with George Beard and Harold Hutchins running away from Tippy Tinkletrousers. As they are running away, the book explains that what happened was something that was not supposed to happen as Tippy and his Robo-pants were not supposed to appear at the point when George and Harold were about to be arrested as they actually came from the future.
The book then explains something called 'The Banana Cream Pie Paradox', which explains that going back to the past and changing something will remain its changed way in the present. Meanwhile, the story switches to the timeline of what will happen if Tippy Tinkletrousers did not appear. As George and Harold are being taken away by the cops, the cops stop by Mr. Krupp's house where he is seen taking out the trash after cleaning the house from the wet soggy toilet paper, The Cops rush and handcuff a confused Mr. Krupp. After their court date, George, Harold, and Mr. Krupp aka Captain Underpants were arrested and were sent to jail. George and Harold are sent to the Juvenile Hall while Mr. Krupp was sent to the Piqua State Penitentiary. The 3 were actually framed and mistaken for Evil George Beard, Evil Harold Hutchins, and Captain Blunderpants's evil antics causing chaos in the town of Piqua.
One autumn afternoon, Tippy (who is also a prisoner from the fourth book) is tasked to build a statue of Warden Gordon Bordon Shmorden who is the chief jailer of the prison, Tippy does the task but instead builds "a giant robot suit". Krupp notices Tippy and he remembers and confronts him for what happened the last time when he shrunk the school and make everyone change their names. However, Krupp does not remember that he as Captain Underpants was the one to put a stop to Tippy's reign of terror that day.
On the day Tippy presents his robot suit to Gordon Shmorden, he reveals his work and climbs on to the suit and freezes everyone in his way (the same suit used at the very end of the eighth book). Tippy then grabs Mr. Krupp and forces him to spill the information of Captain Underpants and to give him the information of George and Harold whereabouts. Tippy soon finds George and Harold and puts Mr. Krupp down, wanting information of Captain Underpants. Krupp picks on them telling them they were in a lot of trouble. Seeing that they were in danger of Tippy plotting his revenge, George and Harold act fast and snap their fingers at Mr. Krupp who turns into Captain Underpants. Tippy then realizes that Mr. Krupp was Captain Underpants all along and Captain Underpants gets chased, while Tippy is unsuccessfully trying to freeze him, soon he accidentally freezes his robotic legs and as a last resort, time travels to five years into the past. Captain Underpants flies down in confusion wondering where he might have gone.
The story switches to George and Harold as kindergartners who have a hard school life due to the fact that Kipper (a school bully and Mr. Krupp's nephew) Moved in from Michigan, five-and-three-quarters-year-old George's mother makes him wear a tie as a good first impression. On his way to school, he notices six-year-old Harold being attacked by Kipper and his group, with the mean owner of a gas station, Billy Bill, egging them on. Angered at this, George plays a smart prank on the owner by changing his gas station's sign from "Free Brake Inspection" to "Free Bra Inspection", prompting a group of infuriated and offended women to attack the latter (and maybe even strangle him to death!). George then saves Harold and the two become best friends. Unfortunately, they didn't know that Kipper was Mr. Krupp's nephew, so they arrive and Mr. Krupp sends the two to detention for "bullying Kipper". To pass time, the two make their first comic: The Adventures of Dog Man.
George and Harold study Kipper for a week and then later switch his padlock for one of their own locks, and replace his stolen lunch money with girly things like friendship bracelets, dresses, and dolls, while sending strange texts to Kipper's goons, all while placing a note from "Wedgie Magee" with it. causing him to get embarrassed in front of his friends However, Kipper eventually catches on to the setup and, the next day, him and his gang steal the pizzas that George and Harold bought for the kindergartners as a way to torture them even further. Infuriated, the two friends come up with another major prank on the bullies in retaliation. First, they fill the four bullies' lockers with shaving cream to pass it off as ectoplasmic ghost juice. While initially this works, Principal Krupp points out that the "ectoplasm" was obviously sprayed through the vents on doors. Enraged and tired of the anonymous pranks, Kipper and his friends begin to torture the kindergarteners for answers, even stealing more pizzas, which George and Harold were actually counting on them to steal, as they ordered them to have double ghost chili peppers (Piqua Pizza Palace's hottest chili peppers) which cause the bullies' tongues to burn up completely, resulting in them getting sent to the nurse's office. George and Harold eventually create a comic that tells the tale of Wedgie Magee and the signs of his curse, all of which match their pranks. After Kipper and his gang "see" that ghost (George on stilts, wearing a giant pair of pants), they run outside in terror, during a severe thunderstorm and power outage.
On Monday morning, Kipper gives a 5 dollar bill to Donny Shoemeyer and promises to return all the money he stole from him. Elsewhere, Kipper's friends are passing out money to the kindergartners and doing good deeds for them. Kipper and his friends eventually gave back all the money they stole and never picked on anyone ever again. George and Harold would later call off the vengeful wrath of Wedgie Magee after they were certain their enemies were truly reformed. However, it is revealed that what happened was what was supposed to happen not what actually did happen. As it turns out, Tippy had time-traveled to when Kipper and his friends were running out of the school.
It then goes back to when Kipper and his friends were running out of the school. At this point, Tippy and his Robo-pants appear. Due to Tippy's dialogue with, Kipper and his friends while it was still dark, they mistakenly thought that it was the Haunted Pants of Wedgie Magee. This shocks the four of them so much, that they all lose their minds. Any sort of mental sanity Kipper and his gang had were thrown out the window, and all of them started to act like complete lunatics. Tippy then travels four years into the future. Unbeknownst to Tippy, his actions led to Kipper and his friends being sent to a mental health institute and the police to immediately suspect Mr. Krupp for what happened to the sixth graders (in both the original and changed timeline, Mr. Krupp was unintentionally beaten up by his own nephew, Kipper, and his friends while escaping from the school due to a blackout). The Cops show up and blame Mr. Krupp. This eventually led to Mr. Krupp being fired which means in a few years he would not be hypnotized by the 3D Hypno Ring into becoming Captain Underpants.
Tippy then time travels back to the present time, thinking that kids five years from the past were weird. However, as Mr. Krupp was hypnotized when George and Harold were in the 4th grade, a universe is created where Captain Underpants never existed. Tippy arrives at a present destroyed and overrun by giant evil zombie nerds. After learning of the changes that have happened in the present, Tippy realizes the terrible mistake he made and becomes determined to return time to normal and save Captain Underpants. But Tippy immediately gets squashed by George and Harold, who are now giant zombies nerds. However, Tippy escapes at the last moment by placing a extra large novelty ketchup catsup packet under Zombie Nerd Harold's left food in the next book, which both of the zombie nerds didn't know that he escaped into his Robo-Pants.