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. They invade a host body and absorb the DNA, then multiply and kill the host. The only natural enemy of the X is the Metroid.

X on SR388

The X, native of planet SR-388, were hunted to near-extinction by the Metroids, which were created for the purpose of eliminating the X. With the extermination of the Metroids on SR-388 by Samus in Metroid II: Return of Samus, the X began to thrive again, infecting, killing, and mimicking the various life forms of SR-388.

X in Samus

While serving as a bodyguard for researchers of B.S.L. on planet SR-388, 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. 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' central nervous system, and an experimental anti-X vaccine 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' suit, as well as the various infected life forms from SR-388, were sent to B.S.L. for research.