Patrick Smash (BRUCE COOK) is a boy with an unusual problem. He was born with two stomachs and an incredible capacity to break wind - not only whenever he wants to but also in the most inappropriate of places.
Picked on at school and deserted by his father, Patrick lives alone with his boisterous bottom until he meets Alan A. Allen (Rupert Grint) a child genius and amateur inventor with no sense of smell! Together, with Patrick's rear end rocket power and Alan's brilliant big brain, the two manage to travel from the school yard, around the world and back again, and out into space.