There's a strong likelihood that the Metroid's mortal weakness, the vulnerability to cold, has been overcome through genetic manipulation. And if that's true, there's no way you can destroy them.

Commander Adam Malkovich

Unfreezable Metroid

Wireframe hologram of an unfreezable Metroid.

An unfreezable Metroid (also referred to as Sector Zero Metroids or Genetic Metroids) is a mature larval Metroid that has been genetically manipulated to overcome the species' mortal vulnerability to cold, to maximise their potential as bioweapons.

In the first Metroid Prime game, according to the Pirate Data, Metroid Forces, the Space Pirates wanted in the future to find a way to shield Metroids from their vulnerability to cold, but were seemingly unsuccessful, or they never tried.

Ironically, it would later be the Galactic Federation, the very enemy which Space Pirates had hoped to defeat with their Metroids, that had successfully and intentionally created the unfreezable Metroids.

In Metroid: Other M, the scientists of the BOTTLE SHIP cloned Metroids from fragments of the Baby on Samus Aran's Power Suit after her return from Zebes in Super Metroid. All but one were genetically altered to be unfreezable, and were stored in Sector Zero. These Metroids were part of a bioweapon program titled Project Metroid Warriors. If successful, they would have completely replaced the Galactic Federation's modified Zebesians. Samus was told this by MB while the latter was posing as Madeline Bergman, but she was not warned of the unfreezable aspect.

Later on, it was said that the Queen Metroid's genes were left unaltered so it would act as a control specimen. She would give birth to normal Metroids to be used for further research where they would eventually be modified into unfreezable specimens.

The physiological differences between those seen in Other M and unmodified variants are their nuclei and membranes: unfreezable Metroids have purple spiked nuclei instead of the normal red raspberry-like shape, and the pigmentation of their membranes is blue instead of green.

Prior unfreezable Metroids Edit

Before the events of Other M, Samus had encountered several strains of Metroid that were either impossible to immobilize in ice, or were invulnerable to damage from cold-based weapons. The first category is the later stages of a Metroid's life cycle on SR388: the Alpha, Gamma, Zeta, Omega and Queen forms. The exoskeletons and tissue of these older individuals prevented their bodies from being encased in ice, but their exposed membranes and/or mouths could still be harmed and/or partially frozen with the Ice Beam.

The second category covers several of the Metroid mutants created through Phazon. These include the Fission Metroid, Metroid Prime and the Metroid Hatcher. Although the Space Pirates extensively experimented with Phazon, the marauding race played no role in the birth of the first two mutant strains as they were created outside of Pirate laboratories and was therefore incapable of recreating them in a controlled environment. While the Metroid Hatcher could still be damaged with Ice Missiles but not frozen, the Fission Metroid and Metroid Prime could achieve complete invulnerability to cold-based weapons depending on a few factors. The Fission Metroid had a high probability of splitting into two Metroids that were immune to the Ice Beam, and the Metroid Prime's first form could briefly be damaged with said weapon and frozen with the Ice Spreader if its exoskeleton shifted to a white color.

The Unfreezable Metroids on the BOTTLE SHIP were thus likely the first to have no vulnerabilities to cold whatsoever.

Hologram informationEdit

Common name: Genetic Metroid
Size: Length 1.5m
Classification: Metroid subspecies able to endure frigid temperatures.


Unfreezable Metroid 2

An unfreezable Metroid in its tank.

  • The unfreezable aspect of the Metroids on the BOTTLE SHIP was first foreshadowed by a dead Gigafraug that appeared to have been fed on by Metroids. Said creature was found in Sector 2 / Cryosphere, a frigid environment.
  • Despite being unfreezable, Adam was able to freeze and kill a baby Metroid that almost killed Samus. Adam infers that, due to its young age, its membranes weren't yet strong enough to endure the frigid temperatures.
  • While the modified Metroids from the BOTTLE SHIP could no longer be frozen, it can be assumed they nevertheless retained their alternate weakness to Power Bombs. However, due to the dangerous nature of Power Bombs and their lengthy cooldown time, this probably is not a wise way to fight them, particularly if they are in a large group. On the other hand, this massive amount of damage would probably cause the Sector to activate its self-destruct procedure and detach from the BOTTLE SHIP.
  • The Metroid Hatcher is a heavily Phazon-mutated Metroid that cannot be frozen, but can nevertheless be harmed with Ice Missiles. It is unknown if this strain of Metroid was created by Pirate hands.
  • The model for the unfreezable Metroid is present in the game's data, possibly indicating that a non-pre-rendered version of the cutscene featuring it was intended at some point.
  • After Samus receives Metroid DNA in Metroid Fusion, the Galactic Federation provides Samus with a Varia Suit upgrade that renders her immune to cold temperatures and prevents her from being frozen in place by SA-X's Ice Beam, technically making her an unfreezable "Metroid". It is possible that the Varia upgrade employed the same biotechnology that protected the original Metroids.

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