"Chozo script translated."

This article's name is an unofficial translation from official Japanese media and may not represent the canonical English name, if one exists.
An alternate name from an official source may be required.

Geron (ゲロン?)[1], also known as alien growth[2], is an enemy in Metroid Fusion. They appear to be some sort of X biomass, but have visual characteristics like that of a Kago. Geron do not attack, but often obstruct certain areas and serve as a nuisance to Samus, sometimes forcing her to take a longer route to an objective. Different weapons are required to destroy different types of Geron, but all can be destroyed instantly with the Screw Attack or Speed Booster.


Geron variants tend to get stronger as the game progresses. The Adam Malkovich AI takes note of this when cyan Geron begin to appear: "Samus, I think they are evolving, growing stronger. Some are now appearing that resist your current weapons."

There is a fourth type of Geron, officially known as the Geron (Air System) (ゲロン(空調システム)?)[1]. This variant only appears in Sector 1 (SRX) and is colored identically to the green Geron, and it has the additional ability to spawn more X Parasites. It forms a mass inside an atmospheric stabilizer, blocking it to alter the environment, and Samus is assigned to clear out all five stabilizers. The Air System type can be destroyed with three Missiles or two Charge Beams.

Official data[]

Metroid Fusion manual[]

"Destroy hatch-blocking enemies with Missiles."


  • When the water level in Sector 4 (AQA) is lowered, it is possible to see a purple Geron relatively early. To do this, Samus must run into the room before the Data Room, and go through the opening in the bottom left corner. An X will form into a purple Geron in the next room, though Samus can run past it while it forms.
  • If Samus progresses into Metroid Fusion far enough without destroying the first green Geron on the Main Deck, it will disappear.
  • The teal Geron periodically shake and generate a sound that can be heard even when it is off-screen.
  • Strangely a Purple Geron takes two Power Bombs to destroy while the larger and more durable teal variant only requires one.
  • In Zero Mission, Tangle Vine Fruit appears similar to Geron, and also plays a similar role in blocking Samus's path.
  • Metroid Fusion: The Official Nintendo Player's Guide refers to Geron as a "blocking organism".
  • This is the damage sound effect any Geron makes (except the Large Teal ones):