"Dragonball Z" follows the exploits of Goku, a powerful Super-Saiyan warrior originally sent to destroy Earth. Goku forgets his true purpose and instead becomes Earth's defender. The story begins as Goku's brother Raditz arrives to finish his job, setting in motion a chain of events that will involve every great warrior on two planets and almost destroy the universe. Other defenders of Earth include: Goku's one–time enemy Piccolo, a warrior from the planet Namek; Vegeta (another Super–Saiyan); and Goku's son Gohan, perhaps the most powerful warrior of all. The name of the series, "Dragonball Z," refers to the seven mystical balls that when brought together give the possessor the power to summon the Eternal Dragon. Once the Dragon arrives, whoever brought the balls together is granted one wish — any wish within the Dragon's power. Once this wish is granted, the balls are scattered to the corners of the planet to be gathered up once more. Goku spends much of his time keeping the balls from the wrong hands. As the world's strongest warrior, he is destined to protect our world, and frequently risks his life to do just that. And that's only the tip of the iceberg. Welcome to the world of "Dragonball Z."