- That's a- these are like jellyfish or something
- Gordon Freeman (Mind of Freeman)
A metroid is a parasitic lifeform which is capable of absorbing any kind of energy. It usually hunts its prey by charging at it and attach itself to it, sucking out the energy from the target. The metroid has had a major role in the Metroid series as an antagonist and sometimes a protagonist (counting Super Metroid and somewhat Metroid: Fusion), and it seems to be a major target for the Space Pirates. It is believed to have been created by the Chozo for culling the Parasite X and for other means as well. A metroid has a high resistance to normal weaponry, but is weak against cold. The metroids have an odd amoeba-like appearance with a big claw-like jaw; they often come in various appearances, which will depict special abilities such as the phazon metroid, which is capable of charging phazon energy to shoot out as a beam with lightning-esque attributes. Their spawns are currently known as miniroids. The most powerful known metroid so far is called Metroid Prime, which has been the main antagonist in up to 3 games in the series.