Dennis and his faithful hound Gnasher are out to make every day as much fun as possible, but their adventures often lead them into trouble. Walter challenges Dennis to beat him in a game with proper rules - five-a-side football. But Walter secretly breaks his own rules, enticing Gnasher to puncture all the footballs... a minor setback for Dennis, who quickly employs Bea to reinflate them in her own unique way, with typically hilarious - or should that be victorious? - results!