<Li> In Funimation's in - house dub, Goku was voiced by Stephanie Nadolny as a child in both Dragon Ball and Dragon Ball GT, and has been consistently voiced by Sean Schemmel as an adult throughout the entire Dragon Ball franchise . Since Dragon Ball Z Kai, Colleen Clinkenbeard has voiced Kid Goku for Funimation . </Li> <P> Goku first appears in Dragon Ball as a monkey - tailed child adopted by the hermit Gohan . Before the series' narrative begins, he accidentally and unknowingly kills Gohan on a full - moon night when he temporarily transforms into the mighty Ōzaru after staring at a full moon . However, Goku loses the ability when his friends cut off his tail . Living alone with an item known as a Dragon Ball which he keeps as a memento of Gohan, Goku befriends a teenage girl named Bulma . He joins her to find the seven Dragon Balls, which, when gathered, summon the wish - granting dragon Shenron . They encounter the desert bandit Yamcha and two shapeshifters named Oolong and Puar, who also join their quest . Goku is later trained by the martial artist Master Roshi, alongside a Shaolin monk named Krillin, who becomes his best friend . It is Roshi who gives Goku the Nimbus cloud (as a reward for saving his pet sea turtle), which becomes Goku's primary source of flight travel across the world . Goku's first shown martial arts attack as a child is Jan ken (ジャン 拳), three physical blows modeled after the hand signs in rock - paper - scissors . As a child, he also wields the Nyoi - bō (如意 棒, lit . "Mind Stick", renamed "Power Pole" in Funimation's dub), a magic staff that extends and retracts on command; given to him by his late grandfather . However, Goku's signature attack is the Kamehameha, which he learned from Master Roshi . The Kamehameha is a concentration of Ki, released as a concussive beam . Roshi spent about 50 years developing and perfecting the technique, but, as a child, Goku is able to understand and copy the technique immediately after only one demonstration . After training with the Earth's god, Kami, Goku learns to fly by virtue of the technique Bukū - jutsu (舞 空 術, lit . "Air Dance Technique") and uses the Nimbus less frequently for flight travel . While participating in the World Martial Arts Tournament that attracts the most powerful fighters in the world, Goku battles foes, later turned allies, such as Tien Shinhan and Chiaotzu, as well as the Namekian Piccolo . After becoming the runner - up champion of the 21st and 22nd tournaments, Goku finally wins in the 23rd with Piccolo's defeat, and marries Chi - Chi soon after . </P> <P> Five years later, Goku meets his evil older brother Raditz and sacrifices himself to defeat Raditz after he learns about his heritage . 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 . While Grandpa Gohan was taking care of him, Goku suffered a severe head injury and forgets his mission to conquer Earth . 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 . 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 . 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 . </P> <P> After defeating Frieza and barely escaping the destruction of Namek, Goku learns a teleportation skill called Shunkan Idō (瞬間 移動, lit . "Instant Teleport", renamed "Instant Transmission" in Funimation's dub), taught by the inhabitants of the planet Yardrat . However, Goku contracts a heart virus whereof the time - traveler Trunks warns him, but recovers after taking medicine provided by Trunks . Later, Goku trains his first son Gohan to be his successor and sacrifices himself again during the battle against the evil bio-android Cell . Goku is temporarily resurrected on Earth seven years later and meets his second son Goten . Goku also battles Vegeta again after Vegeta falls under the control of the wizard Babidi . Shortly after, he is drawn into a battle for the universe against the monster Majin Buu . Despite having mastered two new Super Saiyan transformations, Goku teaches Goten and Trunks to take his place . After his life is fully restored, Goku attempts to fuse with Gohan in order to defeat Buu, but this fails when the latter is temporarily absorbed by Buu and so he persuades the newly arrived Vegeta to fuse with him, creating Vegito (ベジット, Bejitto, "Vegerot" in Viz Media's manga translation). Eventually, Goku destroys Buu with a Spirit Bomb attack . Ten years later, during another World Martial Arts Tournament, Goku meets Uub, Buu's human reincarnation, and leaves with him, intending to train him as the new protector of Earth . </P>

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