Caveboy Charlie Flint invents a fantastic new game that the humans can play with their pet dinosaurs - dinoball! Dinoball becomes very popular throughout the land, and the various teams decide to hold a competition. In the final of the Dinoball Cup, it's the Tuskville Terrors against the Sabreton Sureshots. But the Tuskville Terrors are dreadful cheats who will stop at nothing to win!