Just when George and Harold thought they'd saved the world again - oh no! Here come the Robo-Boogers! Disgusting and dangerous hi-tech robots made of gloomy SNOT. It's lucky that our heroic Waistband Warrior Captain Underpants is standing by, with the power of underwear on his side and his hankie to hand! Just when George and Harold thought they were safe - here come the robo-boogers! Disgusting and dangerous crosses between hi-tech wizardry and, well . snot, they're out to take over the world. Have your hankies ready!