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X Parasite
The X parasites, or simply X, are the species of parasitic organisms fought by Samus in the B.S.L Research Station in Metroid Fusion. They invade a host body and absorb the DNA and memories, then multiply, and eventually kill the host. The only known creatures able to combat the X are the artificial Metroids. Their only known habitat is SR388, although some X invaded the B.S.L Research Station. There are various versions of the X: Blue X, Green X, Yellow X, Red X, Core-X, Hard Core-X, and the mutated SA-X.
X on SR388
The Metroid manga reveals that the Chozo first discovered and named the X on SR388. A camera placed by the Chozo revealed the Xs' destructive nature as one mimicked a Hornoad. In order to combat the X, the Chozo experimented on creating a biological weapon. These weapons would become the Metroids. The Chozo eventually released the destructive Metroids into SR388's environment, where they became the X's predators.
The X, native of planet SR388, were hunted to near-extinction by the Metroids. With the extermination of the Metroids on SR388 by Samus in Metroid II: Return of Samus, the X began to thrive again, infecting, killing, and mimicking the various life forms of SR388. Although there is no mention of the X in Super Metroid, it is assumed that at this time the X overran the planet SR388.
X in Samus
While serving as a bodyguard for researchers of B.S.L. on planet SR388, Samus was infected by an X mimicking a Hornoad. Unknown by Samus, the X multiplied rapidly in her nervous system, and during her return to B.S.L, Samus lost consciousness. Just before her Gunship crashed into an asteroid belt, the security system automatically ejected Samus in an escape pod, which was recovered by a B.S.L. Research Station vessel.
Samus was taken back to Galactic Federation HQ to be treated. Due to the fact that large portions of her Power Suit had been infested by X, they had to be surgically removed. The X remained in Samus's central nervous system, and an experimental anti-X vaccine, Vaccine "Metroid", made from a cell culture from the Metroid Hatchling was used to cure her. As a result, all of the X in Samus was destroyed, and Samus became immune to future X infection. In addition, Samus gained the ability to absorb other X-Parasites, using their energy to replenish her health and weapons.
The removed, infected pieces of Samus's suit, as well as the various infected life forms from SR388, were sent to B.S.L. for research.
X on B.S.L
Blue X
Effect: Restores 30 Points of Energy (When Samus has obtained the Varia Suit, otherwise damages Samus)
Red X
Effect: Recovers 400 Energy, 10 Power Bombs, and 50 Missiles
Green X
Effect: Recovers 2 Missiles
Yellow X
Effect: Heals 10 Points of Energy
