Fred and Anthony may have escaped the evil dentist, Dr. Nietsneknarf -- but they never did finish their horrible hideous history project. So when the boys fail the class, they figure the only way to convince their diabolical teacher, Mr. Bomzie, to change their grades is to catch the mysterious OCD Ghost who is wrecking havoc--not to mention squeaky-cleaning houses all over town. While they're at it, they figure they can earn extra dough by ghost-busting some condos on the other side of the tracks. But when the boys end up at Maniac Towers, they discover to their horror that it is the home of many Netherworld denizens, including the Giant Slimy Snot-Sandwich-Eating Fungus Blob and the Demented Super-DeGerm-O Zombie from Maniac Towers.