Infant, Alpha, Gamma, and Zeta Metroids in the Restricted Lab.
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The Alpha Metroid is the fourth stage of a typical Metroid's life cycle, appearing in three...
This article refers to Metroid Hatchling character within the Metroid storyline. For the infant...
The Gamma Metroid is the fifth stage of a natural Metroid's life cycle. They appear as an enemy...