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Captain Underpants #4: Captain Underpants and the Perilous Plot of Professor Poopypants Award-winning author

by Dav Pilkey (author)

Suitable for 7 - 12 years

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Book Paper or Softback



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  • 160 pages
  • Suitable for 7 - 12 years
Accelerated Reader

AR Level: 4.7 Middle years (1.0 points)

Professor Pippy P. (Pee-Pee) Poopypants is a brilliant scientist who wants to change the world for the better – but his ridiculous name means that nobody takes his fantastic inventions seriously. And when the kids at Jerome Horwitz Elementary laugh at his name too, the poor professor SNAPS! Now crazy Professor Poopypants is on the rampage! He is armed with fiendish inventions Shrinky-Pig 2000 and the terrible Gerbil Jogger – and he’s ready to use them! Only Captain Underpants can stop Professor Poopypants from shrinking the world to the size of a pair of pre-shrunk pants. But can he save its people from a fate even worse than shrinkage: being given a terrible toilety name like Fluffy Toiletnose, Poopsie Chucklebutt and Chim-Chim Diaperbrains…?


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Dav Pilkey


Author and illustrator Dav Pilkey struggled with ADHD at school. He started writing the Captain Underpants stories while banished from the classroom. His books contain scenes which may be considered too silly for grown-ups, small animals and some types of houseplants. If you are a grown-up, a small animal, a houseplant or a teacher, you should seek permission from a kid before reading on!

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What kids think

  1. ninjastickman
    on 6 March 2013


    There is a man who has invented a goosey grow machine that makes things grow but the world cannot take him seriously because his name is Professor Poopypants. So he decides to take revenge on the world by making them have silly names

    4out of 5
  2. dude1234
    on 21 February 2013


    i liked it

  3. hairyfred
    on 4 September 2011


    I liked the little robot things, the gerbils are funny

    4out of 5
  4. migit1
    on 5 March 2011


    funniest captain undrpants book