Three young boys, Rocky, Colt and Tum Tum together with their neighbor girl, computer whiz Amanda are visiting Sacred Mountain amusement park if it's invaded by an army of ninjas led by evil Medusa, who wishes to shoot over the park and also hold the owners to get ransom. Retired television star Dave Dragon and kids, that left his appearance at the park at precisely the period that the ninjas appeared, need to break Medusa plans.