"What's the matter? All I said was that Komaytos look like little Metr—"

Non-canon warning: This article or section contains information that may not be considered an official part of the Metroid series in the overall storyline by Nintendo.
Metroid Prime 3: Corruption Preview trailers depicted blueprints for a Future Aurora Complex. While meant to be taken as Galactic Federation blueprints for an Aurora Unit chamber, it is very worthy to note that the blueprints depict a room nearly identical to the Zebesian Command Center housing Mother Brain in Super Metroid. This has caused debate among fans of the Metroid series about the true nature of Mother Brain and the Aurora Units.


The Mother Brain present in Metroid, its remake and Super Metroid, was originally thought to be an entity of Space Pirate origin, somehow attaining leadership over the marauding race. The Metroid manga, however, presented the bio-mechanical lifeform seen in Metroid and Zero Mission as being built by the mysterious Chozo race, long before the events of any Metroid game and prior to the manga's. When the manga is considered as canon, the only time Space Pirates were ever involved with Mother Brain's contruction was for her reappearance in Super Metroid, as stated in Metroid Prime's instruction booklet [1].

However, weeks before the release of Metroid Prime 3: Corruption, several trailers were made available, with one of them showcasing the Aurora Units (also known as AUs), organic super-computers created by the Galactic Federation two decades before the events of Corruption. Not only did the Aurora Units resemble brains in glass containers, the trailer also featured blueprints of one of these constructs located in a chamber bearing an uncanny resemblance to Mother Brain's room in Tourian; the AU itself is placed in the exact location where Mother Brain is found in her appearances.

The images below are a side-by-side comparison of Mother Brain's first and second chambers, with the blueprints of the future Aurora complex in-between them:

Mother Brain chamber (M1)
Mother Brain chamber (SM)

Based on this comparison, the blueprints correspond far more to Super Metroid's chamber. Further validating this connection is the official chronology of the Metroid games themselves: the manual of the first Prime states that a group of Pirates landed on Zebes following the end of Samus's first mission in order to rebuild their fortress. The entirety of the Metroid Prime series transpire during this reconstruction and before the events of Super Metroid, greatly implying the AU blueprints were ultimately used to rebuild Mother Brain's chamber (if not the entirety of Tourian), and possibly the Pirate leader herself, in time for Samus's second mission to Zebes.

Finally, both Mother Brain and Aurora Units are employed as computers in the manga and Corruption respectively, having access to large digital networks and processing vast amounts of information.


Due to the animosity the Galactic Federation and Space Pirates have held for each other since the former's establishment, fans were perplexed with the trailer, as the future complex and Aurora Units, clearly of Federation origin, were nearly identical to the Pirate leader in her future lair. Adding confusion to this matter was not only the manga's interpretation of Mother Brain being created by the Chozo, but also the statement that AUs were first invented 20 years ago, making it difficult to determine if the Federation's AUs came into being at the same time as Mother Brain (prior to the events of the aforementioned manga).

Numerous theories were formulated to explain the connections between the Pirate leader and the Federation super-computers. The two most popular theories are the following:

  • Mother Brain and the Aurora Units were built simultaneously as a collaboration between the Chozo and the Federation, making the Pirate leader simply a rogue Aurora Unit.
  • Mother Brain was constructed solely by the Chozo long ago, with Aurora Units coming into existence years later and being the result of Federation scientists reverse-engineering the Chozo's creation (with or without the bird-like race's consent). The pirate leader is therefore the first organic super-computer of the galaxy, mother of all future AUs, with an entirely unique class of AI.

Both of these theories are supported by the manga's implications that the Federation's actions, in earlier times, were influenced by the Chozo, with Mother Brain having the capacity to access the organization's database in a similar fashion to Aurora Units. Corruption provides further support with Aurora Unit 313 also turning rogue and gaining additional attributes parallel to Mother Brain's.

As for the blueprints of the future Aurora complex, there is a general consensus among fans that the Space Pirates somehow gained access to them prior, during or after the events of Corruption, using the knowledge provided to rebuild their leader's chamber, if not the entirety of Tourian, for Super Metroid. However, it is open to interpretation as to whether the second Mother Brain is a reconstruction of the first, or a stolen AU compromised and placed on Zebes. Whichever the case is, both variants of Mother Brain are strongly suggested to possess the same personality and intellect; her identity having been transferred or copied from the first body and uploaded to the second. 


  • Though Sector Zero was never actively seen, it is possible the Galactic Federation ultimately used the Aurora blueprints to make MB’s original infrastructure and her chamber, as it was stated that the sector was a faithful recreation of Tourian; chronologically, the last version of Tourian prior to Sector Zero was seen in Super Metroid, which was built by Space Pirates seemingly using these very same blueprints.

Non-canon warning: Non-canonical information ends here.

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