Approximately five years after Dragon Ball's conclusion, Goku is attacked by an extraterrestrial invader named Raditz, revealing that Goku is his long-lost brother and a member of the Saiyan race originally sent to conquer Earth. Raditz kidnaps Goku's young son Gohan, intending to raise him to be the Saiyan his father could never be, which results in Goku and his old nemesis Piccolo teaming up to stop Raditz. Little do they know, two more Saiyans are on their way to conquer Earth and take the Dragon Balls
