Little Moo Monster is growing up and no longer happy to be in a nappy. Moo wants to be more grown-up. So the loveable monster discards the nappy and suddenly there's poop everywhere. Mum gets a potty, and Moo practises sitting on it - until finally success! Moo can progress to grown up pants - which means Moo can go to the Monster Pant Party with lots of little potty-trained (and not-quite-so-potty-trained!) friends.