- This article is about the Infant Metroid that Samus encounters at the entrance to Sector Zero in Metroid: Other M. For other uses, see Baby Metroid (Disambiguation).
In Metroid: Other M, Samus Aran sets off for Sector Zero, an area where the ringleaders of the BOTTLE SHIP propagated Metroids. While proceeding down the main hall towards the sector's entrance, the camera's point-of-view periodically switches from Samus' to an unseen entity observing her from a distance. She eventually halts and turns to her left, where the entity suddenly flies into view, revealing itself to be an Infant Metroid. Taking her by surprise, she immobilizes and recalls the hatching of the baby that bonded with her in a previous mission on SR388. This causes Samus to momentarily hyperventilate, but she quickly regains her composure as she decides to kill it. However, she is shot in the back with a freeze gun from an unknown source before she can fire her arm cannon, and collapses to the floor with her Power Suit dissipating. As Samus lays on the floor in her Zero Suit, the Baby Metroid prepares to attack Samus, only to be frozen and killed instantly by the unseen shooter.
Adam, the person who shot both Samus and the Metroid, explains to her that she cannot destroy the Metroids because they were engineered to have their weakness to extremely cold temperatures removed, and speculates that the reason he was able to freeze the Baby Metroid was because it had not reached the next stage of its life cycle, the larva stage, where the modified genes would have surfaced and rendered the creatures immune.
- Adam managed to kill the Baby Metroid with only one freeze gun shot, indicating that Infant Metroids are extremely vulnerable to any cold-based weapon to the point of dying in a single shot, contrary to the next stage in their life cycle in which such a weapon merely freezes the Metroids in place.
- The cutscene involving the Baby Metroid, Adam and Samus is heavily panned among fans of the Metroid series for several reasons. One of these directly involves the Metroid: Adam states that he was unsure why his freeze gun was able to harm it if all Metroids nearby should be immunized against cold-based weapons, and simply speculates that the Infant Metroid had yet to develop this trait. Adam had therefore taken a highly questionable decision (moreso when he is meant to be a military genius) in disabling Samus first and shooting the Metroid second, as he was in fact clueless if he could have stopped the creature from feeding on her.