Plot Summary
Continuing from the last book, George, Harold, Sulu and Crackers end up in an alternate universe where the whole world is the opposite of their normal world. For example, Melvin Sneedly is struggling to comprehend a simple children's book, Mr. Krupp is nice and has a sense of humor, the villains from the last 7 books are good instead of evil (ex: the Turbo Toilet 2000 is a crossing guard, Zorx, Klax, Jennifer, and professor Poopypants are fire fighters, Frankenbooger and Trixie are construction works,Carl is a mailman, and Dr.Diaper is a police officer.) and the school is overall a welcoming place for students to learn and have fun. There they also meet an evil, alternate version of Captain Underpants, Captain Blunderpants and evil versions of George and Harold (George and Harold's evil counterparts) Sulu and Crackers are kidnapped by George and Harold's evil counterparts and are hypnotized to be evil. Sulu becomes evil and attacks the good George and Harold but Crackers on the other hand, saves them, (Briefly because Crackers might be a female and hypnosis does the opposite on females, the opposite hypno-ring does an opposite effect on MALES, the beams didn't reach Crackers or that the ring only works on mammals).
The heroes finally get back to the normal dimension of the world, but end up bringing the Mr. Krupp of the alternate universe (known as nice Mr. Krupp), Sulu (now known as "Evil Sulu"), and the evil George and Harold with them. The evil George and Harold transform nice Mr. Krupp into Captain Blunderpants by getting water on his head. Intending to rescue Sulu, George and Harold try to leave with their super power juice (from the third book) but due to it being Grandparents Day, they have to eat dinner with their grandparents at George's house, delaying them. While there, the evil George and Harold find George and Harold's tree house, rummage through their personal belongings and find the "Goosy-Grow 4000"(from book 4) and transform Sulu into a giant monster. George and Harold fly over on Crackers' back, and decide that they have to drink the super power juice, but discover that it is empty. They fly to the real Mr.Krupp's house and immediately turn him into Captain Underpants who defeats the "Giant-Evil Sulu". Captain Blunderpants is transformed back into the nice Mr. Krupp by the snap of the finger, and Captain Underpants ties them up, but when Harold states that nothing can go wrong, this causes a rain storm to turn the nice Mr. Krupp back into Captain Blunderpants and Captain Underpants is turned back into the real Mr. Krupp and goes home.
When all seems lost, George's great-grandmother and Harold's grandfather, arrive. As it turns out, they had drunk the rest of the super power juice (which the boys had bought with them to the table), allowing them to become Boxer Boy and Great Granny Girdle, two of George and Harold's comic characters. They defeat Captain Blunderpants, but the evil George and Harold arrive and try to shrink the heroes with the "Shrinky-Pig 2000" from (also from book 4), only to be tricked into shrinking themselves. Sulu is shrunk and turned good again and Captain Blunderpants and the Evil George and Harold (now shrunken) are taken back to their world.
Harold once again states that nothing can go wrong, but this causes police men to arrest them mistakenly think that there the evil George and Harold, who robbed a bank while Captain Underpants was fighting Sulu. Harold again states that things cannot get any worse because they are going to jail for the rest of their lives. This time, however, Tippy Tinkletrousers (Professor Poopypants who changed his name at the end of the book 4) comes and chases George and Harold. The book ends, once again, with George yelling "Oh no!" and Harold yelling "Here we go again!"
Read more about this topic: Captain Underpants And The Preposterous Plight Of The Purple Potty People
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