In Star Trek, the Borg Queen is said to be from Species 125.

Has this species been identified? Or has it been assimilated before the rest of the galaxy could encounter them?

4 Answers 4


We don't know any more than that they were humanoid and were assimilated in 2375. And, as you say, the Borg Queen was one of their number (Memory Alpha).

Species 125 was only mentioned in Dark Frontier, a fifth season Voyager double length episode.

  • 8
    Given the hilariously low number, it's reasonable to assume the species was identified relatively early and has since been entirely assimilated.
    – Jeff
    Aug 9, 2011 at 12:50
  • 2
    @Jeff They're not necessarily all assimilated - the Ferengi managed to be Species 180, after all
    – Izkata
    Jan 31, 2012 at 3:51
  • 1
    @Izkata - that just means that a Ferengi ship - possibly one that was scouting a wormhole for new acquisition targets - was identified and assimilated between species 179 and 181.
    – Jeff
    Jan 31, 2012 at 14:16
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    @Jeff Exactly what I mean. Single Human, Klingon, and Ferengi ships have all made it to (or near) Borg space long before the species in general has. So we really shouldn't assume by the low number that the Queen's species has all been assimilated.
    – Izkata
    Jan 31, 2012 at 14:56
  • @Izkata we have also not heard of any other people from species 125. I agree we shouldn't assume, but it's fun thinking about the possibility.
    – user88476
    Nov 3, 2017 at 20:40

Here is my guess about species 125.

The Queen probably didn't exist until species 125 was assimilated, but given what is stated in Star Trek Legacy (they don't identify them as species 125, but it's pretty clear that they are 125) they were assimilated into the collective to give the Borg more extended control due to their mental abilities of only the females. From the sounds of it all of species 125 was assimilated, and they might have been what formed the collective how it is in the story today.

Now for the guess:

Now the Borg Queen is seen as a single entity, but apparently all of species 125 that is shown in the game all are female (or more to the point the Borg were only interested in them because they had the mental abilities the Borg desired). Given the look of the women in that scene all look like the Borg Queen without the cybernetic implants. the females of species 125 look pretty much identical, so the Borg Queen might be an entity created by the collective that (again guessing!) is a polar opposite of the collective, the Queen is an individual with countless bodies. It also could in canon explain how she can be destroyed in two different places (or time lines) and still exist. It also makes a good argument why she is the only one seen as species 125. (Also makes the Borg a lot harder of an enemy to destroy if the Queen exists in multiple bodies in multiple locations, all of which share one mind and one will)

Anyway that's my theory on species 125, it's not canon though! But it could be if they go that route with the Borg's history.


No members of Species 125 have been encountered outside of the Collective.

I came away from "Dark Frontier" with the impression that most, if not all of the species had been assimilated, but I can't remember if that was ever stated directly.


The Caeliar could be species 125. The reason they were just assimilated and had been known before was because the Caeliar were sent back hundreds of years in time because of an unstable star system caused by their imprisonment of federation crew memebers. They were in a massive city ship that was sent back to the Earth year 1500ish something. It is part of how the Borg were created. In theory the feed back pulse that caused the star to go on the fritz could have been The Q's dealings. The Caeliar liked to control things and use very advanced technology.

  • This isn't supported by anything in the canon
    – Valorum
    Oct 4, 2014 at 19:13

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