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Captain Underpants and the Revolting Revenge of the Radioactive Robo Boxers

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Language  English
Media type  Print (hardback)
Originally published  15 January 2013
Page count  221
Illustrator  Dav Pilkey
4.2/5 Goodreads

Country  United States
Publication date  January 15, 2013
Pages  221
Author  Dav Pilkey
ISBN  9780545175364
Captain Underpants and the Revolting Revenge of the Radioactive Robo-Boxers t1gstaticcomimagesqtbnANd9GcRihuldSwzZBywVw
Series  Captain Underpants series
Genres  Children's literature, Comic science fiction
Similar  Dav Pilkey books, Captain Underpants books, Other books

Captain underpants and the revolting revenge of the radioactive robo boxers

Captain Underpants and the Revolting Revenge of the Radioactive Robo-Boxers is the tenth book in the Captain Underpants series created by Dav Pilkey. It was published on January 15, 2013.



The book picks up right where the previous one left off. Through misdirection, it is revealed that Tippy was not killed at the end of the last book, but instead giant zombie nerd Harold crushed a giant ketchup packet (the book reveals that giant things such as the zombie nerds move really slowly). Tippy Tinkletrousers arrives on an Earth without Captain Underpants. He then vows to change everything back to normal and travels back to the night when Kipper and his friends encounter him (though he travels to 5 minutes earlier to position himself behind the school). They are frozen before they see him, thus they do not go insane, and Mr. Krupp is not fired. Tippy shrinks and abducts his past self, and time travels away right before Kipper and his friends are unfrozen.

He then travels forward in time four years to when George and Harold were about to be arrested (the end of the eighth book). The boys then decide to send their pet pterodactyl Crackers back to the dinosaur age with Sulu, their hamster. The boys then travel back in time, but accidentally take Mr Krupp with them. Eventually, a second Tiny Tippy, slightly younger than the original one, was created to find out where George and Harold went.

Tippy and his two miniature clones then travel back to the dinosaur age (65 Mya) and pursue the boys and Captain Underpants. The tiny Tippies zap themselves back in time and steal the Goosy-Grow 4000, which transforms Tiny Tippy into the colossal Supa Mega Tippy, who betrays Slightly Younger Tiny Tippy. When Big Tippy attempts to use his nuclear bomb to kill Captain Underpants, Supa Mega Tippy zaps himself back in time (with his twin) after kicking Big Tippy and his bomb away into the Gulf of Mexico. When the bomb explodes, it blows a huge crater and kills the dinosaurs (a parody of the Cretaceous–Paleogene extinction event).

The five protagonists and their captor then travel to the African savannas where the boys and their pets gain the trust of some cavemen who inhabit the surrounding jungles. The cavemen are taught English through drawings and subsequently, the boys make the world's first comic book (which involves drawing of traps working on Tippy). The Neanderthals, inspired by the book, then set traps for Tippy and defeat him. He then sets off his freeze ray (which has been tampered with by his younger twin so that it could not be turned off), and the Goosy-Grow enlarges the ice which appears to make Crackers' condition deteriorate and causes the Ice Age (and freezing Tippy himself).

George and Harold are then transported to the future by Slightly Younger Tiny Tippy where it turns out they are now teachers (the mean and cruel ones they are used to) and Mr Krupp is an old man. After getting rid of their evil future selves, old Mr. Krupp gets hypnotized into Captain Underpants, and through the boys' willpower, Captain Underpants and his older counterpart beat up Tippy, who afterwards attempts to use his nuclear bomb to blow up the galaxy. After that, Crackers and Sulu decide to save the entire galaxy by sending Tippy and themselves back to the time before the universe existed. The three are then destroyed by Tippy's giant nuclear bomb and the universe is formed. It also turns out that Crackers had laid a brood of eggs (revealing Crackers to have been a female.) and George, Harold and Captain Underpants decide to take care of them. Suddenly Melvin Sneedly, in a giant squid called the "Supa Squid", appears and captures George, Harold, and Captain Underpants, taking them back to the present.


  • George Beard - A 10 old boy with a flat top.
  • Harold Hutchins - A 9.75 year old boy with poofy blonde hair.
  • Mr. Krupp - George and Harold's mean principal who turns in to CAPTAIN UNDERPANTS
  • Captain Underpants - Mr. Krupp's alter-ego.
  • Sulu - The bionic hamster of George and Harold's.
  • Crackers - The perodactyl of George and Harold's.
  • Tippy Tinkletrousers - The evil villain in the 4th book and 9th book also known as Professor Poopypants.
  • Cave People - The people in the prehistoric area.
  • Melvin Sneedly - George and Harold's nemesis.
  • Trivia

  • Technically, neither the Talking Toilets nor the Turbo-Toilet 2000 should exist if Mr. Krupp was fired during George and Harold's kindergarten year. It was Mr. Krupp who prevented George and Harold to try entering, or even attending, the Invention Convention, which is what led them to mess up everyone but Melvin's inventions. He was also responsible for giving George and Harold detention for the rest of the year as punishment, which is where they created the comic book that featured the Talking Toilets. Finally, he was the one who threatened to suspend them if he saw even one of them out of the detention room. This would lead to George and Harold copying their comic book on the PATSY 2000 out of desperation, and therefore creating the Talking Toilets.
  • In the intro comic, the Dandelion of Doom is featured as one of the villains Tippy inadvertently prevented Captain Underpants from defeating. However, George and Harold are show as zombie nerds, which could only have happened if they didn't know about Zorx, Klax and Jennifer's scheme. Since George and Harold created the Dandelion of Doom in an attempt to foil the aliens' plans to take over the world, neither of them could've created the Dandelion of Doom.
  • References

    Captain Underpants and the Revolting Revenge of the Radioactive Robo-Boxers Wikipedia

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