User blog comment:Xeno 117/Infiltration Part One: A Sonic Crossover Story/@comment-24145744-20140525174715/@comment-24111359-20140525194327

Long time no see indeed. =) I have extensive knowledge of the Metroid Franchise and it's Lore so allow me to fill you in... Here's a brief overview.

When Samus was a little Girl, around 6-8 Years old, the Space Pirates invaded her Homeworld of SSR-388. Leading them was none other than Ridley. Samus tried to make Friends with the Alien, as she was a very kind Child (She was alot like Cream actually), but Ridley wasn't a loving creature. Ridley instead tried to kill Samus but was instead forced to kill her Parents, who got in his way. The orphaned Samus was rescued and raised by a Chozo Elder. For years she went under extreme Chozo training to become the quote on quote "Ultimate Warrior" in the Universe. A few years after she left to join the Galactic Federation as a Space Marine. She was under the command of Adam Malchovik (See Metroid: Fusion and Metroid: Other M) but after a few Years of service she left to become a Bounty Hunter. Clad in the most advanced Chozo Armor at the time, she brought justice and mercy to the weak and defenceless. numerous times Samus has saved the Universe from the threat of the Space Pirates, Ridley, The X-Parasites, and of course... Metroids. Her most dangerous foes by far are Ridley and Dark Samus.

There ya go. Hope that helps. Metroid is a great series, you should really play a Game or two. I recommend Metroid Prime 3: Corruption as a starting point. =)