Those Wretched Mo-Mos' and those Horrible Po-Pos'

Charlotte and Charlie Morgan are a cute, giggly, chattering set of twins who never listen to anyone except each other. They did not heed their mother's warning about the mean gang of monsters who moved into the peaceful meadow across the street. Their mother warned that these monsters collect children for their potpies. Charlie and Charlotte are in for a scary surprise when they meet the monsters.