Reunions

Goku and Gohan arrive at Goku's old sensei Master Roshi's island to meet Goku's old friends Bulma, Krillin, Master Roshi, and Master Roshi's Turtle. The others quickly notice the difference between Gohan's behavior and that of Goku as a child. Goku informs his friends that his wife Chi-Chi refuses to allow Gohan to fight, preferring that he instead he study constantly. The same mysterious alien arrives at the island and reveals himself: he is a Saiyan warrior named Raditz, part of a war-like race that wipes out the population of entire planets to sell the now uninhabited world to the highest bidder and he is Goku's older brother, meaning Goku is actually a Saiyan, explaining his unnatural strength and the tail he once had. Raditz also reveals that Goku's birth name is Kakarot. Goku learns that he was sent to destroy all life on Earth, but his memory loss from a terrible fall as a child prevented this outcome. Goku, Raditz, and the latter's two superiors are now the only Saiyans left alive after their planet was destroyed. Now Raditz has come to Earth to have Goku join him and the other two remaining Saiyans in conquering Earth, and he won't accept a refusal.