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.

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.