Metroid Prime
Metroid Prime and its alternate form Dark Samus is the main antagonist of the "Prime" subseries. It is a strange, black-carapaced, red-eyed creature with a humanoid face within its shell and the ability to control and horribly mutate anything it attaches to. Metroid Prime appears in "Metroid Prime" as the final boss, and after its defeat, reforms itself by stealing Samus' Phazon Suit to become Dark Samus, a black-colored doppelgänger of Samus.