Mentally challenged Raymond Rourke gets blamed and framed by several kids after they accidentally kill his younger brother Bryce. Six years later, Raymond escapes from the state mental hospital he’s been locked up in so he can exact a harsh revenge on the folks who killed his brother and set him up.

Three young boys, Rocky, Colt and Tum Tum together with their neighbor girl, computer whiz Amanda are visiting Mega Mountain amusement park when it is invaded by an army of ninjas led by evil Medusa, who wants to take over the park and hold the owners for ransom. Kids and retired TV star Dave Dragon, who made his farewell appearance at the park at the time the ninjas appeared, have to break Medusa’s vicious plans.