Dark Samus

 Dark Samus is a dark copy of the hero Samus Aran and is the main antagonist in the Metriod Prime series.

The reborn form of the phazon-mutated Metroid Prime. Dark Samus is a being composed of mostly phazon.

Metroid Prime
Though Dark Samus doesn't appear in Metroid Prime, She was born after Metroid Prime was defeated. When Metroid Prime was defeated, the Metroid clung onto Samus and tears the Phazon suit off of Samus and was eventually reformated into Dark Samus.

Metroid Prime 3: Corruption
Dark Samus is referred to as "she" since she possesses the DNA of her counterpart. In Metroid Prime 3: Corruption, on the planet Phaaze, the source of all phazon, she controls the Leviathan Seeds: living creatures that are spawned from Phaaze and contain rooms within their bodies, and carry massive amounts of Phazon.

She plants a seed first into the Pirate Homeworld. Then, Dark Samus, along with the help of the space pirates, leads an attack on the Galactic Federation, and manages to implant one of the gigantic Seeds in the planet Bryyo.

Samus manages to stop one seed from crashing into Norion, a planet important to the Galactic Federation. Dark Samus appears then and hits Samus and her bounty hunter allies and implants phazon within their bodies. Soon after, a Seed is implanted into the planet Elysia. The Seeds begin to corrupt the planets and the forms of life (In Elysia's case).

thumb|right|300px|Metroid Prime 3: The Final Boss (Dark Samus)To be destroyed, Samus enters them, and must destroy a monster who is powered by the Phazon energy inside (probably inside a lung-like cavity). Every time she destroys a monster, the phazon released begins to corrupt her even further. This is a Enemy type like Venom/Carnage to Spiderman.

In the end, she merges with an Aurora Unit to fight Samus, but is defeated, and is presumed to be destroyed for good, although the appearance of a Phazon-blue starship after her supposed demise leaves an element of doubt regarding whether she truly died in the heart of Phaaze...