Anna is training to be a magician with Dave as her helpful assistant, but their disappearing trick is not up to much - that is, until Zombie Katie bestows a magic spell book upon them. Soon they can't stop making stuff disappear, but what will happen when there is nothing left to make disappear in Grimsby?

Dave is thrilled when he wins an electronic home help device called Barry - finally, his family can boss something around other than him, but it is not long before Barry is overwhelmed by the Spuds' demands. Fighting back, Barry takes over Grimsby Heights and heads off to the sea for some well-earned peace and quiet.