|"Son Gokū's Past!!"|
|Rōmaji||Son Gokū no Kako!!|
|Viz||Tails of Future Not-Quite-Past|
|Japanese||October 12, 1988|
|Corresponding uncut Z episode(s)||DBZ002|
|Corresponding Kai episode(s)||DBK002|
Gokū releases the alien has a tail, just like he used to have. He takes this to mean Gokū remembers him, however, Gokū doesn't have a clue who the alien is. Gokū reveals that he did suffer a head injury as a child, which the extraterrestrial believes would explain his amnesia. Muten Rōshi explains to Gokū that his grandfather, Gohan, explained that he found Goku as a child, and the baby was initially violent, until he fell into a gorge and hit his head, nearly dying. When he survived, his violent temper had subsided and he grew into a kind-hearted boy.
Intent on bringing back Gokū's memories, the alien explains that Gokū is a Saiyan who wasn't born on Earth, and that he, the alien, is named Raditz. And he is Gokū's older brother. This shocks the Dragon Team, but Raditz goes further, explaining that the Saiyans are a warrior race who sell planets to the highest bidder after exterminating the native species. Gokū himself was sent to Earth on a mission to kill everyone on the planet. Raditz further elaborates how fortunate it was that Earth has a Moon, as only when the moon is full do the Saiyans show their true powers, which causes Kuririn, Bulma, and Rōshi to remember vividly Gokū's Great Monkey Transformation.
Gokū, however, denies any of it, and tells Raditz to get off his planet. Raditz declines, as the Saiyan race is all but extinct after the destruction of their planet. He claims they need Gokū to help them exterminate the species on a planet they've recently found. Gokū refuses, and Raditz decides that ig Gokū won't join him, he'll simply have to borrow his nephew instead, seeing Gohan's tail as proof of the boy's Saiyan blood. Violently attacking his brother, Raditz kidnaps Gohan, and tells Gokū that if he wants the boy back, he has kill one hundred humans by tomorrow, and line their bodies on Muten Rōshi's island.