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.
Esteto
Cartepedia
Captain underpants and the big, bad battle of the bionic booger boy, part 2: the revenge of the ridiculous robo-boogers (captain underpants #7): color