Meanwhile, Raditz arrives at his spaceship and locks the crying Gohan inside. Bulma offers up her Dragon Radar so that Piccolo and Goku can track the 4-star Dragon Ball in Gohan's hat, thus finding his location. Aware that they now have a common enemy, Piccolo suggests that he and Goku join forces to confront Raditz, which Goku hesitatingly agrees to.
Piccolo encountered Raditz after Raditz had first arrived on Earth, and was terrified by his raw power. Before they can depart, however, he is confronted by his nemesis Piccolo. Goku is clearly distressed at his situation, and vows to rescue his son Krillin and Master Roshi offer to help him fight although Goku tells them to stay because he doesn’t want them to be killed again since Shenron can only revive someone once. Goku tries to attack, but is quickly stopped by Raditz, who then kidnaps Gohan, and gives Goku an ultimatum Raditz will kill Gohan unless Goku kills one hundred humans within the next twenty-four hours. Goku refuses, which prompts Raditz to notice Gohan (who still retains his Saiyan tail), which leads Raditz to threaten the fate of the child. Finally, Raditz mentions that he needs his brother's help in destroying all life on a distant planet. Raditz also reveals that the Saiyans' original home planet, Planet Vegeta, was destroyed by an asteroid some twenty years earlier, and that there are only four Saiyans left, including Goku. Raditz then goes on to state that Goku's original purpose was to destroy all life on Earth, which he should have done in a matter of years after his arrival. This new revelation shocks Goku, who refuses to believe its validity. Raditz telling the story of Planet Vegeta's destruction As a baby, Goku was violent and ill-tempered, though one day he fell down a ravine and suffered severe head trauma, which in turn changed Goku into the happy, amicable child that everyone came to know and love. In a major turning point in the series, Master Roshi reveals that Goku's adopted grandfather, Grandpa Gohan, found a strange space capsule in the woods containing baby Goku. Goku and Krillin understandably think that Raditz is nuts, however Roshi reveals that there may be some truth to the Saiyan's words. Further complicating matters, Raditz also claims that Goku is from the same Saiyan race as he is, and that he and Goku are in fact brothers. Raditz identifies Goku as Kakarot and berates him for not completing his "mission". Unfortunately, the reunion is interrupted by the arrival of a mysterious being, who identifies himself as a Saiyan by the name of Raditz. Goku surprises everyone by bringing along his four-year-old son, Gohan, who is not becoming a martial artist due to Chi-Chi wanting him to keep studying and not getting himself into danger with him fighting all the time. A reunion at the Kame House reunites Goku with his old master, Master Roshi, and his friends Krillin and Bulma, who all have not seen each other in five years. The Raditz Saga begins five years after the events in the Piccolo Jr. Spoiler Warning: Spoiler details may follow. One section of Daizenshuu 2 refer to it as part of the Saiyan Saga, while another section refers to the battle with Raditz as being the "Final Battle" of it's own story arc. The saga covers the arrival of this Saiyan, Raditz, and his fight against his brother Goku and Piccolo. Its main plot concerns the arrival of a humanoid alien, known as a " Saiyan", to Earth, looking for Goku. It was later included in the Funimation Season One Remastered Box Set, which also includes the Vegeta Saga and first 4 episodes of the Namek Saga, and on the Funimation Dragon Ball Z: Dragon Box Volume 1 Set. This saga is the first part of the Saiyan Saga with the rest of said saga being the Vegeta Saga.
"Saiyan Arc"), is the first saga from the Dragon Ball Z series. The Raditz Saga also called the Saiyan Saga ( サイヤ人編, Saiya-jin Hen, lit.