Vaccine "Metroid"

The Metroid vaccine that saves Samus' life.

Vaccine "Metroid" was an anti-X serum that saved Samus from death in Metroid Fusion. Once the X Parasite had infested Samus' central nervous system, she lost consciousness, causing her gunship to drift into an asteroid belt. Her ship's emergency systems automatically ejected the escape pod before impact, which Biologic Space Laboratories later retrieved and transported Samus to Galactic Federation HQ. During the journey, the X multiplied within her, corrupting large areas of her Power Suit. It was learned that the organic components of her Power Suit were so integrated with her central nervous system that it could not be removed while she was unconscious. Large portions of her suit had to be surgically removed, greatly altering the physical appearance of her suit. Unfortunately, the X in her central nervous system were too embedded to be removed safely; her chances of survival were minimal at best. However, a cure was soon proposed: using a Metroid cell to make an anti-X vaccine. This cell came from the infant Metroid that Samus had found on SR388 and given to the Ceres Space Colony. The vaccine was injected and the X were immediately destroyed, meaning the infant Metroid had effectively saved Samus' life a second time. Because the vaccine worked so well, the doctors hypothesized that the Metroids were the natural predators of the X.

While confronting the X aboard the Biologic Space Laboratories research station, it became evident that the vaccine had done more than just save Samus' life; while her body remained visibly unchanged, the vaccine had given her many strengths and weaknesses shared by Metroids, including their immunity to the X Parasites... and their typical vulnerability to sub-zero temperatures. Later on, Samus realizes that she is an easier target for the SA-X; as the SA-X is the result of the X-infected portions of her Power Suit, it has access to all of Samus' weaponry, including the Ice Beam. Its tactics in fighting Samus even resemble the tactics Samus herself used on Metroids not so very long ago on SR388; freeze the target with the Ice Beam, then hit it with a Missile.

There is one other vaccine in the Metroid series, the Galactic Federation vaccine that was developed to cure the Aurora Units of the Corruption Virus. However, it is digitally uploaded and not physically used.

Trivia

• Although vaccines are generally only effective in providing immunity to a disease before infection can take place, the Metroid vaccine also possesses conventional curative properties. It also makes use of Metroid cells and genetic material as opposed to dead or inactive X-parasites, making it closer to an advanced form of gene therapy than a conventional vaccine.
• Metroid Fusion Special Edition: Rebirth of Samus reveals that the vaccine is made from the antibodies of the baby.
• The reason metroids are susceptable to cold is that the cold freezes their membrane so that it can be shattered by missiles. Since samus has no membrane, she should be unaffected by the cold, even with the metroid vaccine inside of her.

Gallery

Samus after being stripped of her normal power suit into the Fusion for the first time, as seen in the intro of Metroid Fusion.

Hueg official fusion suit artwork.jpg

Official artwork of Samus' Fusion Suit.