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. A tiger escapes from Beanotown zoo while Gran is babysitting Dennis and Bea. While the Senior Menace is distracted by a kickboxing game, Dennis sneaks out with a special tiger-catching contraption and heads off for an adventure... Meanwhile, Bea escapes to do some tiger hunting of her own - and proves herself to be the wildest beast of them all!