A bizarre accident lands Frank Harris in Cool World, a realm of cartoons. Years later, cartoonist Jack Deebs, who's been drawing Cool World, crosses over as well. He sets his lustful sights on animated femme fatale Holli Would, but she's got plans of her own to become real, and it's up to Frank to stop her.
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.
During the ill-fated Hungarian revolution of 1956, Karcsi Szabo, star player on the water polo team, is torn between his love for a revolutionary student and his training for the Melbourne Olympics.
