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.
| Actor | Role |
|---|---|
 Victor WongGrandpa Mori | Grandpa Mori |
 Mathew BotuchisRocky | Rocky |
 Hulk HoganDave Dragon | Dave Dragon |
 Loni AndersonMedusa | Medusa |
 Jim VarneyLothar Zogg | Lothar Zogg |
| MMichael O'Laskey IIColt | Colt |
| JJames Paul Roeske IITumTum | TumTum |
 Alan McRaeSam | Sam |
 Margarita FrancoJessica | Jessica |
| CChelsey EarlywineAmanda | Amanda |
 Lindsay FeltonJennifer | Jennifer |
| SSyntrell RyderVeronica | Veronica |
| JJoseph AcklerDoyle | Doyle |
| BBrian AnglinEric | Eric |
 Kirk BailyCarl | Carl |
 Brendan O'BrienZed | Zed |
| DDwayne CarringtonC.J. | C.J. |
| PPat MahoneyHarry Jacobson | Harry Jacobson |
| DDan ShadwellKlaus | Klaus |
| JJames GaleKing | King |
| DDawn MerrickBeverley | Beverley |
| LLawrence E. GalleoosGomez | Gomez |
| PPatrick Adamson'B' Ninja Leader | 'B' Ninja Leader |
| RRoy YerbeyControl Room Ninja | Control Room Ninja |
| DDenis BerkfeldtSmithers | Smithers |
| HHolly JohnsonBlonde Woman | Blonde Woman |
| RRick WilesHarry's Butler | Harry's Butler |
| JJim DirkerHelicopter Pilot | Helicopter Pilot |
| CCharles HudsonMr. Hartman | Mr. Hartman |
| RRobert HimberFBI Tech Andrews | FBI Tech Andrews |