Alpha Metroid

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The Alpha Metroid is the third stage (fourth if counting the egg) of a typical Metroid's life cycle, appearing in two games, Metroid II: Return of Samus and Metroid Fusion.

When a Larval Metroid reaches the Alpha stage, the transparent upper membrane becomes the underbelly (where it remains for the rest of its life cycle), while a plated exoskeleton grows along the dorsal region. This exoskeleton has two compound eyes, a central horn, two small tusks, and four budding limbs where the mandibles once were. Instead of the three nuclei that earlier Metroid stages possess, the Alpha and its following molts up to the Omega Metroid stage bear only a single nucleus; it is unknown what becomes of the other two.

Samus Aran encountered fifteen Alpha Metroids during her mission to SR388.


The Alpha Metroid has very basic and straightforward movements, so it doesn't pose any large threat. Five Missiles on the tender underside will take this creature down. Its only means of attack is ramming, as it lacks the jaws of its predecessor, making it one of the weakest stages of a Metroid's natural life cycle.


"This the [sic] shape of a Metroid after its first molting."


  • Mochtroids, failed artificial replications of Metroids made by Space Pirates, also possess a single nucleus.
  • Metroid: Alpha Type is mentioned in Metroid Prime.
  • While it's plausible that a pupating Alpha flips vertically so that its dorsal membrane becomes its belly and the mouth forms a sealed exoskeleton, it can also be speculated that it's actually the dorsal membrane that becomes the exoskeleton and the belly is simply "expelled" through the former mouth.


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