This question is following similar question about Stargate:

In what order should I watch the various Stargate TV Series?

After looking at pages about Millennium and The Lone Gunmen on X-Files wikia, I noticed references to certain episodes of X-Files series themselves; is there any established order of watching the series, or should I just watch the spin-off series at any point before watching episodes of the original series that are said to conclude spin-offs?


3 Answers 3


You don't really need to watch either Millennium or The Lone Gunmen to understand the events in the main X-Files series. Millennium isn't really a proper spin-off; it was just created by many of the same people. The only place where it intersects with the X-Files is in the season seven episode of the X-Files called "Millennium". This episode wraps up the entire Millennium story, so you can watch all of that series and all of the X-Files up to season seven in any order before watching that episode.

The Lone Gunmen is a proper spin-off, since the characters Langley, Frohike, and Byers appeared in the X-Files for years before they got their own show. They appeared in all nine seasons of the X-Files, but they didn't get their own show until the eighth season. To watch their appearances in order, watch the first eight seasons of the X-Files up to episode 11 (The Gift, original air date February 4, 2001), which was their last appearance before they got their own show. Then watch the first six episodes of The Lone Gunmen (which premiered March 4 through March 30, 2001), switch back to the X-Files for a few episodes up through episode 15, watch episode seven of TLG, episode 16 of the X-Files, then finish up TLG before you get to the season eight finale of the X-Files.

  • 5
    Or... just do yourself a favor and skip The Lone Gunmen show altogether.
    – Omegacron
    Oct 24, 2014 at 20:01
  • But Millennium is soooooo good. But super, super dark compared with X-Files. Aug 13, 2017 at 5:09

X-Files 1
X-Files 2
X-Files 3
X-Files 4/Millennium 1
X-Files 5/Millennium 2
X-Files Movie (AKA "Fight the Future")
X-Files 6/Millennium 3
X-Files 7
X-Files 8
The Lone Gunmen
X-Files 9
X-Files: I Want to Believe
X-Files 10

  • 2
    Can you explain why you think this order is the best?
    – Valorum
    Oct 24, 2014 at 19:50
  • This appears to be the order in which they were filmed, including the simultaneous run of Millennium and TXF. What I'd like to know is why no one has asked when to watch Harsh Realm?
    – sanpaco
    Dec 1, 2015 at 23:50

A good site for the X-Files "mythos" episodes (the overarching story line) is Wikipedia. Keep in mind, many of the standalone episodes not related to the overarching story line were also stand out episodes. As for the Lone Gunmen spin-off series; most of the 13 episodes were just re-hashed episodes of the X-Files from the Lone Gunmen's point of view.

  • While this link may be useful, it's a good idea to mention what it says here as well. That way if the link ever goes kaput your answer would still be an answer. Aug 13, 2017 at 8:06

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