Dark Samus

Dark Samus was a being of Phazon taking on the form of Samus Aran and the reincarnation of the organism known as Metroid Prime. After making a cameo appearance in the secret ending of the Metroid Prime game, she became the secondary antagonist and the final boss in Metroid Prime 2: Echoes, and the main antagonist of Metroid Prime 3: Corruption.