who was the first saiyan to fight goku
Goku Five years later, Goku meets his evil older brother Raditz and sacrifices himself to defeat Raditz after he learns about his heritage.[42][43] Goku comes from a race of extraterrestrials called Saiyans, himself having been sent from their home planet to prepare Earth for sale on the intergalactic market by destroying all its life.[44] While Grandpa Gohan was taking care of him, Goku suffered a severe head injury and forgets his mission to conquer Earth.[44] In order to fight the Saiyans invading Earth, Goku trains with King Kai in the afterlife. He teaches Goku the Kaiō-ken (界王拳, lit. "World King Fist"), which multiplies his ki and strength for an instant, but with possible strain to the body.[45] It is also from King Kai that Goku learns his most powerful attack: the Genki-Dama (元気玉, lit. "Energy Sphere", renamed "Spirit Bomb" in Funimation's dub), an energy sphere created by gathering ki from surrounding animals, nature and humans.[22] After being revived by the Dragon Balls, Goku faces off with the Saiyan prince Vegeta, who eventually becomes another ally. On his journey to Planet Namek in order to aid his friends in gathering the Namekian Dragon Balls to revive the ones killed by the Saiyans, Goku fights the galactic tyrant Frieza, who destroyed the Saiyans' home planet and nearly the entire race. During his epic battle with Frieza, Goku becomes the first Saiyan in a thousand years to transform into a fabled Super Saiyan.[46]