Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy
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Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy is duom of children's books by Dav Pilkey, part of a series of books with "Captain Underpants" in the titles.
Part 1: The Night of the Nasty Nostril Nuggets
Template:Spoiler At Show and Tell, George and Harold show off a new prank of theirs, the squishy. The idea is to place ketchup packets under a toilet seat so the next person who sits on the toilets gets ketchup sprayed all over the back of their legs (or the front, if they push down the toilet seat while standing in front of it).
Everyone wants to try it out, but Melvin Sneedly, the bossy nerd from book 2, forces everyone to watch his Show and Tell project, which is a combining machine. Using his hamster, Sulu, and a robotic hamster body he built, Melvin combines the two so Sulu is now a bionic hamster and enjoys the special powers given to it by the robot.
Since Sulu has special powers, Sulu no longer obeys Melvin (who likes to hit Sulu with a paddle) and instead paddles Melvin. Melvin becomes furious when George and Harold adopt Sulu, when they make a Captain Underpants comic book starring Melvin as an evil tattle tale with "I love dollies" posters in his room. Finally, when Melvin becomes the victim of a squishy, he decides to get revenge.
Melvin goes home and builds a robot that is the same size as him. His idea is to combine himself with the robot so he will have special powers like Sulu, that way he can get revenge on George and Harold. Unfortunately, Melvin sneezes at the last moment, so he gets combined with the robot and boogers, turning him into a bionic booger boy.
Melvin is very disgusting now, but not unhappy because he's now the star football player (no one wants to tackle him because he's covered in boogers). When the class visits a tissue factory, Melvin becomes gigantic and evil as a natural defense against the tissues.
George and Harold get Mr. Krupp to turn into Captain Underpants to save the day. He saves his secretary from Melvin, and she gives him some wet kisses as thanks. The water from the kisses turns him back into Mr. Krupp, and he is then defeated.
Sulu comes in and defeats the Bionic Booger Boy. Melvin's parents, who are scientists, come in and pledge to try to help turn their son to normal. George and Harold's suggestion, turning the batteries in the changing machine upside down, suprisingly works, and Melvin and Mr. Krupp are brought back, with the robotic booger globs go flying off. The book ends with the robotic booger globs coming to life, destroying the changing machine, and chasing Melvin, Mr. Krupp, George, Harold, and Sulu.
Part 2: The Revenge of the Ridiculous Robo-Boogers
Template:Spoiler The three robo-boogers are about to destroy our heroes when Sulu swallows them and then spits them into outer space. As everyone prepares to go home, it becomes obvious that there was a mistake with the change machine, and now Melvin is in Mr. Krupp's body, and vice-versa.
When Mr. Krupp (in Melvin's body) turns into Captain Underpants, George and Harold are forced to tell the secret of Captain Underpants to Melvin, who was utterly fooled by this because Captain Underpants is bald and Mr. Krupp has hair (it's strange that the kid with perfect grades couldn't see through Mr. Krupp's bad toupee).
Since it would take a long time to make a new change machine, Melvin decides to build a time machine, which is built in two days. He builds it in the library, which is run by a stereotypical book-banning librarian (this is a response to the banning of the Captain Underpants books). The idea is that no one goes to the library because it only has one book in it.
Melvin explains to George and Harold that they must be careful with the time machine, because if it's used two days in a row, some unknown bad thing will happen. George and Harold go back in time two days and retrieve the changing machine after it gets Melvin and Mr. Krupp back, but before it is smashed (they replace it with a change machine look-alike). This is done thanks to the use of a memory-erasing machine on Melvin's parents.
They go back to the time machine in the library, where the librarian steals the change machine and the memory-erasing machine. The boys go back in time and get a flying dinosaur ("Crackers"), then go back to the when the librarian stole their stuff, then get their machines back thanks to Crackers. The librarian is convinced she is dreaming because dinosaurs don't exist. Harold goes to return Crackers back to his own time, then they erase the librarian's memory and go back to their own time.
Melvin gets Captain Underpants to come to them (Captain Underpants, in Melvin's body, has been getting into trouble by doing stuff like preventing the football team from winning a game by stealing the ball, which he mistakes for a UFO). He uses the change machine to switch them, so Melvin and Mr. Krupp are in their own bodies, but Melvin sneakily gives himself Captain Underpants's superpowers.
Meanwhile, the robo-boogers in space grab onto a spaceship that was examining Uranus, where the robot and the toilets from book 2 are. They hang onto the spaceship as the spaceship goes back to Earth. Once on earth, they start destroying the spaceship center.
Captain Underpants, despite the fact that he doesn't have super-powers, decides to go after the robo-boogers. George and Harold follow him. They originally lose to the robo-boogers, but figure out that the robo-boogers die when they come into contact with oranges (the vitamin C in the oranges counteracts against the cold that made the boogers). This way, they kill Carl, one of the robo-boogers, but the other two, Trixie & Frankenbooger become cautious and dodge the oranges.
Captain Underpants defeats the robo-boogers by standing on top of a toilet store (the top of the store is a giant toilet lid) and doing an annoying dance. The robo-boogers start to climb up the buiding, when they get hit by a well-placed squishy (see book 6).
Melvin comes and lies to the news crew, saying he beat the robo-boogers with his super-powers. George and Harold sneak back to the school while Melvin is interviewed by the news people. George and Harold return with the change machine and the memory-erasing machine. They change Melvin and Captain Underpants so Captain Underpants has his powers again, then they erase the memories of the news crew (and therefore the television audience).
Melvin whines about how he's not a superhero anymore, but no one cares because he was a selfish jerk for the last two books. Melvin gets his comeuppance when the people Captain Underpants bugged while he was in Melvin's body (the football team, some old ladies, and some skateboarders) come back for revenge.
When George and Harold return to their clubhouse, George learns that Harold did not take Crackers back to the dinosaur age, but is keeping him as a pet, like Sulu. The next day, George, Harold, Sulu and Crackers go into the time machine to send Crackers back home, even though Melvin said something about not using the time machine two days in a row. The book ends with them starting the time machine, and the unknown bad thing happening.