It's Peter's last day at the Dumping Ground before he goes to live with Terry and Jill. Everyone attends his party, except Tracy, who is secretly looking after two giant African land snails for the weekend. Later that night, it's full moon, and Zac has hung up garlic all over his and Ryan's bedroom so as to scare off vampires. And the snails escape from their cage. So, soon enough, everyone is creeping about all over the DG.