As a young adult,
Goku meets his older brother, Raditz, who tells him that they come from a warrior race of extraterrestrials called Saiyans. The Saiyans had sent
Goku to Earth to destroy it, but his
ship crashes upon arrival.
Goku fell into a deep ravine and lost all memory of his mission.
Goku refuses to help Raditz continue the mission, after which he begins to encounter others who want to battle him, such as the Saiyan prince Vegeta. He also encounters Frieza, who is considered to be one of the strongest beings in the universe, after which
Goku begins training his first child, Son Gohan, to be his successor. Years later, a group of soldiers from the Red Ribbon army known as androids appear to kill
Goku. Another android, Cell, absorbs Androids #17 and #18 from the Red Ribbon army to increase his power, then fights
Goku and Gohan, resulting in Goku's death. Goku decides to stay
dead for seven years to train in the Other World. When he returns, he is drawn into a battle for the universe against an extraterrestrial named Majin Buu. Joined by Vegeta and Gohan, the
evil half of Buu is destroyed and the Good Buu (Mr. Buu) settles down with them. Ten years later at a martial arts tournament, Goku meets
evil Buu's human reincarnation, Uub. At the end of the series, Goku takes Uub away on a journey to train him as another successor.
