George and Harold are up to their old tricks again, and when their latest prank makes a direct hit on school brainiac Melvin Sneedly, he decides to get even! But in the blink of an eye -- and the sneeze of a nose -- Melvin goes from snooty to snotty, and the Bionic Booger Boy is born! Can Captain Underpants clean up this catastrophe, or will the mucous monster make a mess of things?
George and Harold get into a sticky situation in Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy Part 1: The Night of the Nasty Nostril Nuggets, the "sixth epic novel" by Dav Pilkey. Harold and George's latest prank makes "school brainiac" Melvin Sneedly vow to get revenge. But when Melvin transforms himself into the Bionic Booger Boy, things get a little drippy. Can Captain Underpants save the day?