Captain Underpants and the Terrifying Re-Turn of Tippy Tinkletrousers

Captain Underpants and the Terrifying Return of Tippy Tinkletrousers is the ninth novel in the Captain Underpants series, written and illustrated by Dav Pilkey. The book marks the second appearance of Tippy Tinkletrousers (a.k.a. Professor Pippy P. Poopypants). Super Diaper Baby appears as well.
It was scheduled to be released on May 29, 2009, but it is not in stores or available for online purchase. There is no updated release date as of yet on the Captain Underpants or Scholastic websites. It is unknown if the book has been canceled, or simply delayed.
Plot summary
This story is immediately proceeded from the eighth novel. Tippy (who before was Professer Pippy Pee Pee Poopypants) lunges at George and Harold, but fortunately, Sulu knocks him out. Harold insists that they have defeated Tippy, but George still hears his arteries beating. George convinces Harold that they still have to return Crackers back to the Cretacious Period of the Mesozoic era, and the only way to do that is to use the Purple Potty that Melvin had invented, but Harold says that Melvin warned us to let it cool off if it was used two days in a row, and they have. George accepts, and decides to use Melvin's Forgetchamacallit 2000 to wipe the police's memory about George and Harold being mistaken by Evil George and Evil Harold for robbing Frank's Bank so that they will not go to jail forever and then get rid of the evidence. The next two days, George tells Harold that it was time to return Crackers back to the prehistoric period.
At first, Harold was reluctant to take Crackers back, but he finally agreed. They locate the Purple Potty, and then begin to set the controls, but Tippy gains consciousness and sees the flash of green from the Purple Potty. Tippy suggests that George and Harold were inside there, and that they are going to the prehistoric period because they were probably returning their pet Quetzalcoatlus that he has no clue how they ended up with it. Tippy wants to catch up with them, but apparently, the Purple Potty is now in the prehistoric era, and Tippy has no time machine. But luckily (for him), Tippy was the best inventor of all time (besides Thomas Edison) and he decides to invent one.
Meanwhile, George and Harold find Mavis Janet Armadlina, a female 15-year old student from high school. Her Green Mechosie 3000 Time Machine teleports her to the prehistoric era to look for dinosaurs to take pictures of animals like Allosaurus, Triceratops and Pteradactyl. When her pet hyena, Zelda, can find clues of dinosaur feet, Mavis warns George nobody will be entering the Tyrannosaurus Pexendactylo, the largest Blue T-Rex, George and Harold waved "good bye" to her.
When Tippy Tinkletrousers was finished, he finds the Goosy-Grow 4000 lying on the ground. He uses it to enlarge his time machine, but George and Harold return to the present and Tippy finally has them right where he wants them. George and Harold run to their school and Mr. Krupp comes darting toward them and tells them that they have been absent in school, and wants to know a good reason why. George frantically snaps his fingers, and Mr. Krupp was now removing all of his clothes except for his underwear and then flying quickly to his school and ties the red curtain with black dots that was in his office, then dashes back to take on Tippy.
Captain Underpants kicks Tippy's Turbo Trousers 2000, knocking it down and he and his two companions escapes to the prehistoric era in the purple potty, but Tippy uses his time machine to get there as well. Then they were both in the same period. Tippy freezes Captain Underpants with his Freezy Beam 4000 and it seemed that George and Harold were impendingly doomed. But Sulu takes on Tippy. Sulu destroys Tippy's Freezy Beam 4000, but he vowed that he will get his revenge. Tippy finds a Tyrannosaurus Rex and uses it to conquer Sulu. But eventually, the hot sun melts the ice that froze Captain Underpants. The ice turns into water, which produces the same effect that if you pour water on Captain Underpants's head, he turns back into Mr. Krupp but George snaps his fingers again, and he turns back into Captain Underpants. Captain Underpants, Sulu, and Crackers team up and defeat Tippy and the T-Rex.
Tippy Tinkletrousers's Weapons
Tippy Tinkletrousers appeared at the end of the eighth book in giant robotic pants called "Turbo-Trousers 2000". A freeze gun came out of the top of the trousers to freeze the two cops that laughed at his new name. He called it the "Freezy-Beam-4000". On the last page of the eighth book, a picture of Tippy Tinkle trousers riding a Tyrannosaurus Rex chasing the main characters is seen, along with new, upcoming books.
Main Characters
* George Beard and Harold Hutchins - two lovable pranksters.
* Mr. Krupp/Captain Underpants - Principal of Jerome Horwitz Elementary School/A superhero created by George Beard and Harold Hutchins.
* Pippy Poopypants/Tippy Tinkletrousers - A very, very mad professor, mad meaning both crazy and angry.
*Sulu - George and Harold's pet bionic hamster.
*Crackers - George and Harold's pet Pterodactyl. It is suggested to be a female in Book 8 because Crackers did the opposite of what it was supposed to do, and in Book 5, the announcer said that women do the opposite of what they were supposed to do if they were hypnotized. However, it could still be a male since it simply does not understand human language.
*Zelda - (another) female to the gang, Marvis Janet Armadlina's pet hyena and later a member of the Captain Underpants team.

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