Animation. Dennis lives in Beanotown with Mum, Dad, little sister Bea and his pet dog, Gnasher. Gnasher is more than a dog to Dennis: he is a kindred spirit. Whatever Dennis does, Gnasher does with him. Together with their friends Curly and Pie Face, Dennis and Gnasher believe the world truly is their oyster and that kids should make the rules. Not everyone agrees, including Mum and Dad, but Dennis and Gnasher are not going to let that stand in the way of their pursuit of fun! After hearing about a bat creature spotted in Beanotown, Dennis and Gnasher go on the search, and come to the conclusion that there is a vampire on the loose. Dennis calls on Curly and Pie Face to help. At first they are not sure who the vampire is, but looking at the signs, they realise that the vampire is the Colonel. Dennis and his friends try to prove it, but their quest leads them to find the Colonel with all the other residents of Beanotown - meaning that they are all vampires. Refusing to be beaten by vampires, Dennis and his friends launch an attack, only to be faced with the truth - that the residents are all gathered for the Beanotown Founders Day and the 'proof' against the Colonel was all very simple. Dennis's imagination gets him into trouble again.