Goku is a male Saiyan and the main protagonist of the Dragon Ball metaseries. Cheerful, tenacious and also a bit naïve, Goku is a Saiyan originally sent to Earth as an infant with the mission to destroy it. However, an accident alters his memory, causing him to grow up pure-hearted and later become Earth's greatest defender, as well as the informal leader of the Dragon Team. Throughout his life, he trains hard and constantly strives to be the greatest warrior possible and to fight stronger opponents, which has kept the Earth and the Universe as a whole safe from destruction many times.