Years after a mysterious plague has wiped out most of the adult population, the surviving children have grown up to form violent motorcycle gangs. Young Lee, tired of life on the farm, goes out in search of adventure and soon winds up in the middle of a war between a pair of rival gangs. Soon after Lee proves his worth and is accepted into one of the gangs, however, a new threat appears in the form of the evil Sunya Corporation, which wants to utilise the gangs for their own purposes. Can Lee lead his new-found friends to safety?