Are there any Star Trek episodes (any series) that take place in the Beta Quadrant?

  • TOS, TNG and ENT mainly take place in the Alpha Quadrant.
  • DS9 somewhat takes place in the Gamma Quadrant.
  • VOY mainly takes place in the Delta Quadrant.

I'm in the middle of DS9 after watching all of VOY and TNG, and I can't recall any episode that mainly took place in the Beta Quadrant or had any key action referencing that quadrant1.

Is there any episode that matches the above criteria?

1 Maybe except for the fact that I heard that the VOY crew was supposed to reach somewhere in the middle of Beta Quadrant, before the series was cut down. But that is not the context in which I'm looking for an answer.

EDIT: I'm asking about episodes where it is mentioned on-screen, they happen in Beta quadrant.

  • 2
    Doesn't this have the answer?
    – Rand al'Thor
    Oct 26, 2015 at 23:00
  • 3
    Wikipedia says: Although the Romulans and Klingons are shown by maps as part of the Beta Quadrant, Star Trek: Deep Space Nine did not use this terminology, referring to them as Alpha Quadrant powers. Ronald D. Moore noted that the "Alpha quadrant is firmly planted in the audience's mind as where the Federation, the Klingons, and the Romulans all live so I think we'll stick with that nomenclature".
    – Junuxx
    Oct 26, 2015 at 23:01
  • 2
    Wouldn't the Reunification episodes of TNG, as well as 95% of Nemesis count as taking place in the beta quadrant?
    – CBredlow
    Oct 26, 2015 at 23:08
  • Well... yes. Seems so!
    – trejder
    Oct 26, 2015 at 23:14
  • “the VOY crew was supposed to reach somewhere in the middle of Beta Quadrant, before the series was cut down” — the series was cut down? Oct 27, 2015 at 9:45

4 Answers 4


According to Memory Alpha, the Klingon capital is located in the Beta Quadrant, as is Vulcan, Andoria, and a number of other well-known planets.

So, as one example, much of Sins of the Father was set on Qo'noS, and hence in the Beta Quadrant. Similarly, a number of episodes were set on Vulcan, and The Aenar was set on Andoria.

From the fact that the Enterprise NX-01 visited both Andoria and Vulcan at least once, without apparently needing to travel any unusual distance to do so, we can even speculate that most of Enterprise was probably set in the Beta Quadrant. (This is supported by Star Trek: Star Charts.)

Support for this interpretation in primary canon is limited.


If we were to rely on the answer for this question involving quadrants then there have been several episodes and movies taking place in the Beta quadrant.

Star Trek the Undiscovered Country takes place in the Klingon Empire, which is in the Beta Quadrant

Star Trek: Nemesis takes place in the space around Romulus and Remus (as well as the neutral zone), which is also in the Beta quadrant.

There are several episodes of most series (I can't think of any in Voyager off the top of my head) which involve either the Romulan home world, the Klingon home world, or different planets in their respective empires.


A couple of maps for you, both taken from the Star Trek: Star Charts book:

enter image description here Source

enter image description here Source

As you can see, the border between Alpha and Beta quadrants passes through the Solar System, effectively splitting the UFP territory in two almost equal parts. It is roughly a situation equivalent to the Greenwich meridian

So, to answer your question: most of the episodes of TOS, TNG, DS9 and ENT (and now DIS too) take place more or less equally both on the Alpha and the Beta quadrants.

  • This is not an answer to my question, because it is too general / too high-level. While asking, I expected an actual list of episodes, which takes place in Beta quadrant (preferably those where the fact that they're happening in Beta quadrant is mentioned on-screen).
    – trejder
    Apr 30, 2018 at 7:10
  • Being them the vast majority and being them in the hundreds, you are asking for something that I doubt anyone is willing to do. I, at least, I'm not really eager to read through the wiki pages of every single ST episode, just to compile a list of items.
    – Sekhemty
    Apr 30, 2018 at 7:20
  • Consider also that questions that explicitly ask for list of items are generally not well accepted here.
    – Sekhemty
    Apr 30, 2018 at 7:22
  • 1
    @trejder: You may have asked for a list of episodes, but that question was based on an incorrect premise -- that the number of episodes would be relatively few. Since that's not true, this is what you get. Frankly, this is probably a better answer than the one that's already accepted at this point in time. Apr 30, 2018 at 15:21
  • 2
    @trejder Memory Alpha reports that the last aired DIS episode is the 744 one of all series, and you want an answer that cites all those that explicitly mention on screen the beta quadrant. I am not against this, if someone (or even yourself) want to do it, but I'm not going to do this myself.
    – Sekhemty
    May 1, 2018 at 11:02

Beta Quadrant is referenced vaguely throughout the franchise but since no consistent map was ever part of the series bible logic of where things are falls apart and later writers (probably wisely) chose not to call too much attention to it. That said, the ST Star Charts layout, though not canon, is pretty widely accepted, with Earth near the Alpha-Beta border and Klingons, Romulans, Gorn, etc. being Beta powers with some Alpha territory and being referred to as Alpha powers presumably because they're part of the same political community. The Federation is Show to have territory in both as well. How they would function the way Star Charts has it seems problematic, as do episodes that imply closer positions of some factions such as the Klingons and Cardassians, but that all can work once you consider it's a flat map of space and the galaxy is 1,000 light years deep on average, so those empires may have space that sort of wraps over or under the Federation, and all Federation territory may be connected in the same manner.

  • 1
    This answer would be much better with paragraphs, consistent grammar, punctuation and evidence to support your points.
    – Valorum
    Apr 28, 2018 at 8:39
  • Earth is not near the border between the two quadrants, it (well, Sol) and the center of the galaxy are what define the border.
    – T.J.L.
    Apr 30, 2018 at 15:37

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