Orphaned during a Space Pirate raid on her home of K-2L, Samus was adopted by the mysterious Chozo and taken to Zebes where she was infused with their DNA and raised to become a warrior. Once she reached adulthood, Samus joined the Federation Police where she served under the Commanding Officer Adam Malkovich, but she ultimately left to become a Bounty Hunter, though she was nonetheless recruited by the Galactic Federation on many occasions. Armed in her cybernetic Power Suit, Samus has become famous for her accomplishments on missions others thought impossible. Her most renowned achievements are the destruction of the Space Pirate base on Zebes, her role in ending the Galactic Phazon crisis, her extermination of the Metroid species, and her disobedience of orders at the BSL station where she chose to destroy the deadly X Parasites rather than turn them over to the Galactic Federation.
Samus broke ground early in the gaming world in the 1986 game Metroid, her first appearance. Originally players were under the impression that Samus was a male, as even the instruction booklet confirmed this. However, completing Metroid in under an hour revealed Samus to be a young athletic woman. Although Samus wears the Power Suit throughout most of the Metroid series, it has become a tradition to depict her in much more revealing attire at the end of each game, often as a reward for satisfying certain conditions such as completing the game quickly or with a high percentage of the game’s items collected or even both. [Source: wikia]