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Captain Underpants and the Sensational Saga of Sir Stinks-A-Lot
Captain Underpants Sir Stinks-a-Lot.jpg
Author Dav Pilkey
Illustrator Dav Pilkey
Country United States
Language English
Series Captain Underpants series
Genre Children's, humor, comic science fiction
Publisher Blue Sky (US),
Scholastic (US)
Publication date
August 25, 2015
Media type Print (hardcover)
Pages 208
ISBN 0545504929
Preceded by Captain Underpants and the Tyrannical Retaliation of the Turbo Toilet 2000 

Captain Underpants and the Sensational Saga of Sir Stinks-A-Lot is the twelfth and final book in the Captain Underpants series, written and illustrated by Dav Pilkey. The book continues after the eleventh book, as George, Harold, and their clones switch places, but to find their gym teacher Mr. Meaner turning into Sir Stinks-A-Lot, who makes the students turn into slaves, and Today George and Harold and their adult counterparts must save the world before it’s too late.


A message from Dav Pilkey informs those reading that unlike previous books which appealed to both adults and children, this book will attempt to appeal to solely children.

On the planet called "Smart Earth", one scientist is mixing smart Diet Coke, smart Pop Rocks, and smart Mentos and this experiment cause Smart Earth to explode, one chunk lands in a grape garden causing the grapes to become smart, they try to wage war on humans but they dry out. Another chunk landed at the Piqua Valley Home for the Reality-Challenged. Gym teacher Meaner eats a chunk and becomes smart, he tries to walk out but two doctors block his way but he confuses them, and he and the other teachers escape. He then tells the other teachers that they must return to their jobs. Mr. Meaner turns an abandoned factory into his factory, and he makes a strange substance with sweaty gym socks called rid-o-kid 2000. Yesterday George and Harold are told to go to his office, at his office he sprays them with rid-o-kid 2000 and it turns them into robot-like slaves. The other teachers are amazed at their behavior, though other George and Harold are not, and they get sicker because of excessive homework. They see a commercial for the “Rid-O-Kid 2000” and disguise themselves as adults, making the children do silly things "for" the teachers. The teachers call in Mr. Meaner and enraged at what he sees, he gets out his Stinky Kong 2000, now a mech suit.

Deciding to seek help from adults they can trust, George and Harold go to their parents, only to find that they know they've changed and preferred it that way. Feeling heartbroken, they go to Melvin's house to find his Robo-Squid, then travel forward in time to find the older version of Yesterday George and Yesterday Harold, now famous graphic novel writers, and their families, with whom they are also disappointed. The older Yesterday and younger Today versions of George and Harold travel back in time to find Mr. Krupp. The older George and Harold tried to snap their fingers, but as he had been washing his face, he can not turn into Captain Underpants, and Mr. Meaner beats them up anyway. Once Mr. Krupp dries his face, they snap their fingers and turn him into Captain Underpants, defeating Mr. Meaner and sending him to prison.

After eating an egg salad sandwich with pickle relish and radioactive, Meaner turns into a gigantic blob (because the egg salad contains mayonnaise and he added pickle relish; this would create Zygo-Gogozizzle 24) called Sir Stinks-A-Lot. He then causes havoc downtown. Captain Underpants returns to fight him back, but when Old George and Old Harold are captured and absorbed, Sir Stinks-A-Lot discovers Captain Underpants' weakness and turns him back into Mr. Krupp by splashing water from Franz Pond on him, making him fall down (he's still unharmed because of his superpowers). He then drains Captain Underpants' powers with his own after scanning his DNA, presumably taking the effects of the 3d Hypno Ring as well. He runs off screaming as Old George and Harold telepathically call for Tony, Orlando, and Dawn, Sulu and Crackers' children. They feed him Mentos, Diet Coke, and Pop Rocks, making him explode. Luckily, the three hamsterdactyls and Old George and Old Harold are unharmed, as well as Mr. Meaner, who's back to normal.

Things are back to the way they were, and as young Today George and Harold return their older Yesterday counterparts to their own time, they find that Mr. Krupp doesn't turn into Captain Underpants at the snap of a finger, because Mr. Meaner erased Captain Underpants from existence. Aside from Harold's initial confusion; he, George, and their older counterparts do not seem to care in the slightest. They decide, given there are a George and Harold to cover for them, they'll use Melvin's time machine to find their pets Crackers and Sulu. The younger Yesterday George and Yesterday Harold wake up to find that Tony, Orlando, Dawn, George, and Harold are gone. They go back to their treehouse. Yesterday Harold feels that he and Yesterday George should make another Captain Underpants comic book, but Yesterday George decides that they should scrap the “Captain Underpants” comics entirely and do a comic book featuring Dog Man instead, leading to their future selves encountered by Today George and Today Harold. The book and series ends here, and unlike other Captain Underpants adventures, George and Harold don't deliver their signature lines of "Oh, no!" and "Here we go again!".

Comic: Dog Man: The Bark Knight Cometh

This is a random chapter. Dog Man attacks the cops by assaulting them, then he reveals that he's actually Petey the cat. He tries to slice them up with his sword, but above, Dog Man – as his superhero alter ego, "The Bark Knight" – falls toward Petey and breaks his sword with his bone numb-chucks. The two engage in a fight, and while this is happening, Petey shoots hand rockets at Dog Man, revealing he's actually Mecha-Petey (a robot version of Petey). He assaults Dog Man, then Milly – a cop – kicks Mecha-Petey in the face, removing it and revealing he's actually Porkbelly, an angelfish.


  • George Beard and Harold Hutchins – Two mischievous best friends who are fourth-graders at Jerome Horwitz Elementary School.
  • Yesterday George and Yesterday Harold – George and Harold's doubles.
  • Old George and Old Harold – Yesterday George and Yesterday Harold's future counterparts.
  • Mr. Krupp – George and Harold's principal. Principal of Jerome Horwitz elementary school.
  • Captain Underpants – Mr. Krupp's superhero counterpart. He is later erased from existence.
  • Mr. Meaner / Sir Stinks-A-Lot – George and Harold's mean gym teacher who is the main antagonist of this book.
  • Tony, Orlando, and Dawn – Three super hamsterdactyls and the offspring of Sulu and Crackers.
  • Melvin Sneedly – George and Harold's nemesis.
  • Ms. Ribble – George and Harold's English teacher.
  • Miss Anthrope – The secretary of Jerome Horwitz Elementary School.
  • Miss Calculator – George and Harold's math teacher.
  • Mr. Rected – The school guidance counselor.
  • Mr. Rustworthy – The school's music teacher.
  • Miss Labler – The school psychologist.
  • Ms. Guided – A teacher.
  • Miss Fitt – Another teacher.
  • Ms. Zurry - Another teacher.
  • Ms. Dayken – Another teacher.
  • Warden Gordon Bordon Schmorden – The jailer of Piqua State Penitentiary.
  • Mrs. Beard – George's future wife.
  • Billy – Harold's future husband.
  • Meena and Nik, Yesterday George's future children.
  • Owen and Kei, Yesterday Harold's future adopted children.
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