George and Harold thought they were finally safe from the grossest monster in town. Their new pet, Sulu the Bionic Hamster, saved the day, and school genius Melvin Sneedly is almost back to normal. But just when everything seems calm, a gooey new threat appears. Meet the Ridiculous Robo Boogers. Now, the boys and their buddies are running for their lives with these sticky, giant blobs right on their heels. You will join George and Harold on a hilarious, slime filled chase as they try to outsmart the grossest enemies they have ever faced. Expect non stop action, silly jokes, and awesome comic book pages as Captain Underpants and the crew fight to save the day. Will the boys escape this messy disaster, or will Sulu have to step up and be a hero one more time?