Dave and his friend Zombie Katie are working on a school project together about endangered animals, so George takes them on an expedition to the local park to see what they can find. There they discover the much-fabled Beast of Grimsby - and Dave must decide between a gold star at school and the future of the beast.

Gran sits in front of the television for so long that she turns into a cocoon, and with a little help from Dave - who wants his favourite seat back - she hatches into a moth. When Moth-Gran sets her sights on the moon, it's up to the Spuds to find a way to entice her back.

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.

Lil Sue has started a delivery company called Deliver Sue, and in a quest to raise money for a new set of wheels, Dave lands himself with a job - Anna thinks she knows how to deliver packages quicker than Dave, though, and a dramatic sibling rivalry soon unfolds.

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 warned by local fortune teller Madam Donald that walking under a ladder will bring bad luck - he walks under one anyway, and soon a meteor is heading for Grimsby. It is up to Dave and his friend Robert Robot to catch it before everyone is squished.

Dave finds a handheld computer game at the dump which involves killing zombies - his friend Zombie Katie, however, finds the game rather insulting. Exacting her revenge, Dave finds himself confronted with a group of very angry and very real zombies.

Dave and his friends embark on a school trip along a canal where they awaken an ancient monster called Big Lippy, who pushes them over a waterfall and sends them back in time to the Jurassic era.

Dave stumbles across a mermaid at the dockside who invites herself round for tea and takes up residence in the Spuds' bathtub, so Dave and his family must somehow persuade their unwanted guest to go back to her watery home.

Dave and his friends get lost on a school orienteering exercise thanks to Robert Robot, who is unable to read the map - snatched by a flock of giant tiger pigeons and deposited into their equally giant nest, Dave must retrieve the map from Robert and get them all back to school.

Gran has been particularly naughty lately and is sentenced to a stay in an old people's home, but the home is the stuff of nightmares for Gran, and it's soon up to the Spuds to break her free.

Dave is practising for Grimsby's Grimmest Face competition and finds that the wind changing direction really can cause the face to stick...