He was the eternal will of the Zerg Swarm.Her first aim is to find the Protoss and assimilate them to be perfect.He learned all his grand knowledge from ancient creators, the Xel Naga.The Overmind was primarily created for leading the little minded Zerg Broods.But once this ability given the Overmind, he developed himself and accumulated the knowledge which came from assimilated organisms.And at last the Overmind attacked the Xel Naga and reached very very important datas.The most important information was the necessity of eridicating the race Protoss.After this event the Overming became more aggressive to all races near him to find the Protoss as soon as possible.Then Dark Templar Prelete Zeratuls’ mind touched his mind at a war on Char while he captured the knowledge of reincarnation of cerebrates ,the overmind reached the secret location of Protoss homeworld Aiur from Zeratuls’ mind.After this ironic relations the overmind morphed into a protective form to survive at the severe up atmosphere of planet Aiur.And seeded himself into that planet.While the Protoss defenders fighted by the renegeade Zerg swarms he evolved and morphed into hive clusters at the planets’ surface.But the use of channelling dark and high templar energies with twin crystals Uraj anad Khalis former executor Tassadar sacrificed himself to kill the Overmind .After the death of the overmind the whole metabolism of Zerg reincarnate the Overmind but without the collected knowledge, in other words there were a raw and new Overmind growing on Char.