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?
- Age Range: 7 and up
- Hardcover: 176 pages
- Publisher: Scholastic Inc (August 28, 2018)
- ISBN-13: 978-1338271492