
Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy, Part 1 is the 6th Captain Underpants book written by Dav Pilkey. The book starts with a demonstration day in class, where George and Harold show how to play a prank on people when they sit down on the toilet. Melvin then shows how he built a robot to combine two elements, demonstrating on Sulu the Hamster, but no one cares. Later, George and Harold also write a comic about Melvin, portraying him negatively and making him really mad.