Captain Underpants and the Perilous Plot of Professor Poopypants

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Captain Underpants and the Perilous Plot of Professor Poopypants
Captain Underpants Professor Poopypants.jpg
Author Dav Pilkey
Illustrator Dav Pilkey
Country United States
Language English
Series Captain Underpants series
Genre Children's novel
Publisher Blue Sky (US),
Scholastic (US)
Publication date
29 July 2000 (black & white)
January 2016 (color)
Media type Print (Paperback)
Preceded by 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)
Followed by Captain Underpants and the Wrath of the Wicked Wedgie Woman

Captain Underpants and the Perilous Plot of Professor Poopypants is the fourth book in the Captain Underpants series written by Dav Pilkey.


A scientist from New Swissland named Professor Peepee P. Poopypants invents a shrinking machine called the Shrinky-Pig 2000 and an enlarging machine called the Goosy-Grow 4000. He goes to the United States of America to demonstrate how these inventions help the world, using his machines to minimize garbage and increase the world's food supply. Unfortunately, everyone laughs at Professor Poopypants' name instead of taking him seriously.

At Jerome Horwitz Elementary School, the school is going on a field trip to a restaurant-arcade (similar to Chuck E. Cheese's). When George and Harold rearrange the letters of the lunch sign, their principal Mr. Krupp bans them from the field trip and instead demands they clean the teachers' lounge. George and Harold get revenge on Mr. Krupp and the other teachers by re-routing the water system, planting powdered paste on the ceiling fan, and placing Styrofoam in the refrigerator. After the field trip ends, Mr. Krupp and the teachers enter the lounge. Mr. Meaner (the gym teacher) turns on the lights, causing the ceiling fan to spin around with the powder paste falling off. Nobody seemed to notice, and Ms. Ribble (George & Harold's teacher) goes to the sink for a drink of water. The faucet malfunctions and sprays her and the other teachers. The ceiling fan spins faster, and the paste lands and sticks to the teachers. The teachers quickly assume that George and Harold were behind this prank. Ms. Ribble opens the refrigerator and the Styrofoam flies around the room thanks to the ceiling fan, making the situation even worse. Angry and silly-looking, they chase George and Harold around the school. After seeing the teachers running through the school looking like snowmen, the school's science teacher Mr. Fyde decides to retire, thinking he's going insane.

Meanwhile, Professor Poopypants has had no success showing his inventions to the world, and sees an ad in the newspaper to teach at Jerome Horwitz. He applies for the job, thinking that children would be kind and sweet-hearted, but the children soon discover they are no different than his peers. Poopypants manages to get the children interested in science by building a robot machine that allows gerbils to jog alongside their masters. However, this interest is short-lived, as he reveals his middle name to be Pee-Pee, causing the children to start laughing again. Sometime later, Ms. Ribble reads the story of the Pied Piper of Hamelin. This inspires George and Harold to make a comic book about the Professor inventing an army of gerbil joggers to destroy the world, by being forced to listen to Cher, which destroys the last of Professor Poopypants' credibility with the students and drives him crazy.

Using his enlarging machine, he makes the gerbil machine as large as a tall building and then gets inside. He shrinks the school and holds them hostage. He then unveils his plan to force everyone in the world to change their names into a more silly, funny one. He creates a system of 3 alphabetical name charts based on the first letter of each part of a full name (First, Middle, Last). Professor Poopypants does this first on Mr. Krupp, who is now Lumpy Pottybiscuits.

George and Harold (now Fluffy and Cheeseball) get Captain Underpants (technically Buttercup Chickenfanny, though Underpants refuses to change it) to steal Poopypants' enlarging machine, but unfortunately he and the machine are shrunk in the process.

The two of them try to enlarge the school back to normal size, but get flicked off the school. Harold makes a paper airplane that George enlarges. The plane flies into many threats, yet Captain Underpants rescues them and end up in an abandoned alley. George tries to enlarge Captain Underpants (accidentally enlarging Harold's right hand) to the size of Poopypants' gerbil machine. Captain Underpants then fights and defeats Professor Poopypants. Once Professor Poopypants is defeated, everyone's names revert to their original state. The boys use the shrinking and enlarging machines to bring the school and Captain Underpants back to normal size. Captain Underpants is soaked with water, turning him back to Mr. Krupp.

Professor Poopypants is hauled off to prison. To the advice of George and Harold, he changes his name to avoid embarrassment. However, since all names originating in the land where he comes from are silly, he chooses his grandfather's name, Tippy Tinkletrousers, causing the prisoners to ridicule him even more (setting the climax for Book 9).

At the end, the two boys note that the morals of the story ("I think this is the first time one of our stories had a moral," notes George) is that it's not nice to mock other people and to never hypnotize your principal.


Captain Underpants and the Pied Pooper of Piqua[edit]

The comic begins with an introduction by Professor Poopypants. Everyone laughs at his ridiculous name causing Pippy to make an army of Gerbil Jogger 2000s and inserted gerbils, but they refuse to be evil, so he makes them listen to something on headphones. The gerbils take all the kids hostage but Captain Underpants intervenes. When everyone still laughs at him, Pippy uses a button on his tie to make himself into a giant robot. Captain Underpants and Professor Poopypants fight and Pippy catches him. But Captain Underpants uses a tiny toilet (called "The Tiny Toilet of Poop" to flush the water over Pippy, making him rust.) The headphones are revealed to be playing Cher. Captain Underpants destroys the headphone remote control, and takes Professor Poopypants to jail. The back of the comic reads: "Notice: All animal cruelty was simulated. No actual gerbils were forced to listen to Cher."

Captain Underpants comic[edit]

The Captain Underpants comic reveals what happened in the last three books to how Mr. Krupp became Captain Underpants to how he got super powers.


  • George Beard
  • Harold Hutchins
  • Mr. Krupp/Captain Underpants
  • Chuckles Jingleberry McMonkeyburger, Jr.
  • Stinky McMonkeyburger
  • Jiggles T. Chunkyskunks
  • Tipper Q. Zipperdripper
  • Professor Pippy P. Poopypants/Tippy Tinkletrousers
  • Porkbelly Funkyskunk
  • Connor Mancini
  • Ingrid Ashley
  • Larry Zarrow
  • Stephanie Yarkoff
  • Robbie Staenberg
  • Janet Warwick
  • Melvin Sneedly
  • Ivana Godadebafroom
  • Mr. Rected
  • Miss Labler (mentioned)
  • Ms. Ribble
  • Mr. Meaner
  • Miss Anthrope
  • Ms. Guided
  • Mr. Fyde
  • Dr. Diaper (cameo)

See also[edit]

Dav Pilkey and Captain Underpants.

Following Book[edit]

The book that followed this was The Wicked Wedgie Woman (2001).


The Book received mainly positive reviews from critics, making the villain, Professor Poopypants, appear in later Books of the series as both a recurring character, or even the main villain.

The book was removed from an elementary school in Page, North Dakota due to parental complaints.[1]


  1. ^ ITALIE, HILLEL. "Captain Underpants to return". Associated Press. Retrieved 30 September 2012.