Wikitroid:Featured article queue/Month 07, 2009

SA-X (also known as Samus Aran-X) is the tenth boss Samus faces aboard the Biologic Space Laboratories research station in Metroid Fusion. Although it is not chronologically the final boss in the game, it is without a doubt the game's primary antagonist and main adversary.

The SA-X is an X Parasite mimicking Samus. After Samus's first encounter with the X on SR388, her Power Suit was infected by the parasites. The Galactic Federation removed the suit surgically and sent the pieces to the Biologic Space Laboratories research station's Quarantine Bay. Once there, the infected suit parts transformed into a X resembling Samus. The SA-X was able to use a Power Bomb to escape the Quarantine Bay, which caused the capsules containing all the X to break open, starting the infestation. Adam: I believe the SA-X came from the capsule containing your infected suit parts. It used a Power Bomb to escape the Quarantine Bay. That explosion breached the capsules containing all the X that started this disaster.