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.

Boog's friends rally to bring him home from a Russian traveling circus.

Barkley Michaelson is in a deep life rut. He's struggling to finish his PhD thesis when his father, the learned Eli Michaelson, wins the Nobel Prize for Chemistry. Barkley and his mother, Sarah, a renowned forensic psychiatrist, now have the ill-fortune of living with a man-eating monster whose philandering ways have gotten less and less discrete. As if Barkley's world is not bad enough, on the eve of his father receiving the Nobel, Barkley is kidnapped and the requested ransom is the $2,000,000 in Nobel prize money. Needless to say, Eli refuses to pay it and so starts a venomous tale of familial dysfunction, lust, betrayal and ultimately revenge. In the words of Michel De Montaigne, the 16th century philosopher: "There is more barbarity in eating a man alive than in eating him dead."