In Cave-land Ohio, 500,001 BC, the tribal leader of
Cave-land, Big Chief Goppernopper, forces Gak, the older sister of Ook, to marry him to keep Ook and Gluk from bothering him. After saving her from a sandpit, the two Cave-kids befriend one of the dinosaur species Mog-Mog, and her baby, and stop the wedding. Angered, Goppernopper walks away until he meets his descendant, J.P., who is the CEO from 2222 A.D. The Goppernoppers steals natural resources from caveman days through a time portal, since natural resources will be used up by that year. Ex-Chief goes back to the past and forces every cave-person in Cave-land to belong to the Goppernopper Enterprises. The Cave-kids and the baby Mog-Mog are shoveling until the Goppernoppers take them to 2222 to torture them, but the baby helps them escape and the three hide in Master Wong's School of
Kung-Fu. Ook and Gluk grow up, training under Master Wong for 7 years, but the cave-kids have to give the right answer: "Who is the greatest man?" When it's time to save their people, they finally answer: nobody. Wong finally awards them black belts. They and their dinosaur friend Lily travel back to caveman days (in 500,008 BC) and free the slaves. Goppernopper returns and orders his Mecha-saurs to attack the cave kids and dinosaur, but they spray-paint on the Enterprises building, then an explosive tank, which also destroys the Mecha-saurs themselves. Goppernopper sends them a letter, that Wong and Lan will be executed if the kids won't surrender. Back to 2229, Ook and Gluk plead with the Goppernoppers that they will do anything to satisfy them, and they handcuff the three but vow to execute them all. Wong tells them to remember their training, then, when J.P. prepares his ray, the Cave-kids ask: "Who is the greatest man?" J.P. and Chief answer themselves, and their argument eventually makes J.P. shoot and kill Chief, which accidentally
erases himself and his damage on the world from history. The Cave-kids and Lily run back to the disappearing portal, but Ook soon returns for Lan, who agrees to be his cave wife, and they warp back together, while 2229 receives a brighter and peaceful future. Lily finally reunites with her mother, while the Cave-kids, Lan, and the dinosaurs return happily to Cave-land. ==Characters==