Dragon Ball Z

Dragon Ball Z (commonly abbreviated as DBZ) is the long-running anime sequel to the Dragon Ball TV series, adapted from the final twenty-six volumes of the Dragon Ball manga written by Akira Toriyama.The anime adaptation premiered in Japan on Fuji Television on April 26, 1989.On August 31, 1998 episodes began airing on Cartoon Network's weekday-afternoon programming block, Toonami, where the series received much more popularity.

Plot
Five years after the events of Dragon Ball, now a young adult and father to son Gohan, Goku meets his older brother Raditz, who reveals to him that they are members of a nearly extinct extraterrestrial race called the Saiyans. The Saiyans had sent Goku (originally named "Kakarrot") to Earth as an infant to conquer the planet for them, but he suffered a head injury soon after his arrival and lost all memory of his mission, as well as his blood-thirsty Saiyan nature. Goku refuses to help Raditz continue the mission and has to team up with Piccolo, and sacrifice his life, in order to defeat him. However, Goku is revived a year later by the Dragon Balls, after training in the afterlife with King Kai, in order to save the Earth from the Saiyan prince Vegeta. However, in the battle Yamcha, Chaozu, Tenshinhan and Piccolo are killed. Due to Piccolo being one with Kami, the Dragon Balls no longer exist, resulting in a group traveling to their home planet, Namek, in order to use the balls there to revive their friends. However, the galactic tyrant Freeza is already there doing the same, leading to several battles with his minions and Vegeta, the latter of which teams up with the heroes to fight the Ginyu Force. After Goku arrives, the final long battle with Freeza himself comes to a close after Goku transform into a legendary Super Saiyan and avenges the lives of billions across the galaxy\

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Wikipedia

http://en.wikipedia.org/wiki/Dragon_Ball#Dragon_Ball_Z