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X Parasite
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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, though their natural habitat is SR388. They invade a host body and absorb the DNA and memories of the host before killing it, enabling the parasite to mimic its appearance. The only known creatures able to combat the X are the artificial Metroids. 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 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 is 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 crashes into an asteroid belt, the security system automatically ejects Samus in an escape pod, which is recovered by a B.S.L. Research Station vessel.
Samus is taken back to Galactic Federation HQ to be treated. Because large portions of her Power Suit are infested by X, and because these portions are integrated with her nervous system, they have to be surgically removed. The X remain in Samus's central nervous system, and an experimental anti-X vaccine, Vaccine "Metroid", made from a cell culture from the Metroid Hatchling is used to cure her. As a result, all of the X in Samus are destroyed, and Samus becomes immune to future X infection and gains the ability to absorb other X-Parasites, using their energy to replenish her health and weapons. However, she also inherits the Metroids' weakness to cold as an unexpected side effect of the vaccine.
X on B.S.L
X-infected life forms from SR388 and the infected portions of Samus's Power Suit are transported to B.S.L for research, where the X run rampant through the station's six sectors (partly due to Samus's actions there). Below are the effects of absorbing the most common varieties of X.
Blue X
Effect: Restores 30 Points of Energy (when Samus has obtained the Varia Suit, otherwise damages Samus) They can be stunned with Samus's beam.
Red X
Effect: Recovers 400 Energy, 10 Power Bombs, and 50 Missiles (usually encountered before bosses)
Green X
Effect: Recovers 2 Missiles
Yellow X
Effect: Heals 10 Points of Energy
Sprite
| Pathogens and Conditions | |
|---|---|
| Organic | |
| Synthetic | |
| Phazon | |
