He was the head of the Kaguya Clan. Anime debut: Naruto Episode #126 Because of Kimimaro's frightening abilities, even among the Kaguya Clan, he kept him locked away until one day, he released Kimimaro to help destroy Kirigakure. After reaching Kiri's outskirts, he ordered the entire clan to enter the village in order to destroy it, simply to show off their clan's fearsomeness. Although they were briefly able to gain the upper hand, they were eventually surrounded and outmatched. Knowing they would lose, the clan head told the remaining members to have fun and take as many of the enemy as possible with them, which eventually led to the death of every member, except Kimimaro. (Source: Narutopedia)