"Metroid Prime 3: Corruption is a first-person action-adventure game developed by Retro Studios and published by Nintendo for the Wii video game console. It is the tenth game in the Metroid series, and the final entry in the Metroid Prime trilogy excluding two spin-off titles. It was released in North America and Europe in 2007, and in Japan the following year. The Wii Remote and Nunchuk devices are featured in a new control scheme that took a year to develop and caused the game's release to be delayed several times.
Corruption is set six months after the events of Metroid Prime 2: Echoes. The story follows bounty hunter Samus Aran as she assists the Galactic Federation in its fight against the Space Pirates. While fending off a Space Pirate assault, Samus and her fellow bounty hunters are attacked by her doppelgänger, Dark Samus, who incapacitates them with a mutagenic material called Phazon. After Samus loses contact with the other hunters, the Federation sends Samus on a mission to determine what happened to them. During the course of the game, Samus works to prevent the Phazon from spreading from planet to planet while being slowly corrupted by the Phazon herself.
Source: Wikipedia, "Metroid_prime_3," available under the CC-BY-SA License.