The SA-X is a creature in the video game Metroid Fusion. She is a parasite that originally infected the protagonist, Samus Aran, as well as her Power Suit, before Samus was cured by injecting Metroid DNA into her. Wikipedia
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What does SA-X stand for?
The SA-X (named by Adam and presumably short for Samus Aran-X) was the main antagonist of Metroid Fusion and the eleventh boss Samus faces on the Biologic Space Laboratories research station. It is an X Parasite mimicking Samus Aran and her Power Suit.
Why does the SA-X save Samus?
It went out of its way to defend Samus when it would've been better off just running away from the Omega Metroid. The SA-X probably realized it would die if it remained on the BSL and its only hope of escape was Samus's gunship.
How many SA-X are there?
You know that the SA-X reproduce by asexual division. Because of this mechanism, there are now no fewer than 10 SA-X aboard the station." Adam: "Samus, you must go. Get out.
How to beat SA-X?
Stick to the low ground and fire charged beam shots directly at the SA-X to destroy it. Your beam must be fully charged to damage it. As it approaches, Space Jump over the SA-X to the other side of the floor while charging your beam, and release the shot when you land.