The third installment in the Mucus Phelgmball series finds 11-year-old superhero, Marcus Fleming, freaking out because he snoogered Turner, the town bully, in the head. Despite his best friend Chunk's reassurance, Marcus is afraid trouble is looming when Turner fails to ride the bus the next day. Then Marcus wakes up during the night and sees someone in his backyard, staring up at his window and is convinced he started trouble. The next morning, Marcus finds a fluorescent green blob on his lawn. The color is too similar to his snoogers to be a coincidence. Marcus takes the rubbery substance to Dr. Boogerslinger and his worst fears are confirmed. It's earwax, it's Turner's and it's explosive. Are Mucus Phlegmball and Master Blaster about to face their first human villain?