Skip to the truth: the essential watch order for The X-Files mythology

Fancy marathoning The X-Files but can't face trawling through all 218 episodes (plus the spin-offs and two films) just to figure out what's actually important to the main storyline? Yeah, it's a minefield. Here’s the truth about how to tackle the so-called 'mythology'—or 'mytharc' if you want to sound clever—without getting sucked into a black oil rabbit hole or wasting your time on a were-lizard episode (unless you’re into that sort of thing).

What Actually Is The X-Files Mythology?

For the uninitiated, the mythology is the tangled conspiracy thread running through the lot—aliens, abductions, secret syndicates, and all that jazz—which is a completely different beast to the ‘monster of the week’ escapades. Mulder and Scully spend most of the series piecing together the alien plot and dodgy government coverups. Monster episodes? Loads of fun, but they don’t typically move the main story along. The confusing bit: the mythology is spread out in bursts, meaning if you just plough through the whole lot in order, you’ll get a random mix of world-ending conspiracies and, say, a possessed tattoo (that’s season 4 if you’re wondering).

A Quick Word On Spin-Offs & The Carter-Verse

If you’re really keeping score, there’s one full spin-off, The Lone Gunmen, and then there’s Millennium, which isn’t technically an X-Files spin-off but gets thrown in anyway because Chris Carter made both and there was a crossover. Do you have to watch them all to enjoy or understand the main story? No, not unless you’re chasing perfection.

"This isn’t just the perfect X-Files viewing order. It’s what I’ve been training for my entire life."

The Guide: What To Watch & When

Below is the breakdown for anyone wanting to stick to the conspiracy backbones, with a handful of non-mythology gems flagged for those who like the odd detour.

• Season 1 (1993-1994)
  Get started with the basics. If it’s marked as essential, it actually brings you up to speed on the aliens, the Syndicate, or the bigger arc:
  • Must-watch (mythology): Pilot, Deep Throat, Fallen Angel, E.B.E., The Erlenmeyer Flask
  • Non-essential that's still top-tier: Squeeze (monster-of-the-week classic), Beyond the Sea (Brad Dourif being brilliant), Ice (paranoia-fuelled thriller)
  • Season 2 (1994-1995)
    • Mythology essentials:
    • Extra credit: Irresistible (creepy guy, no aliens), Humbug (first truly comedic episode)
    • Season 3 (1995-1996)
      • Mythology:
      • Can't-miss non-mythology: Clyde Bruckman's Final Repose (Peter Boyle, psychic insurance salesman), Jose Chung's From Outer Space (meta, weird, brilliant)
      • Season 4 (1996-1997)
        • Mythology:
        • Bonus: Home (disturbing, iconic), Small Potatoes (hilarious shapeshifter story)
        • Millennium (optional, 1996-1999): Not part of the X-Files storyline, but you might want to watch its run in sync with X-Files Seasons 4-6 if you want to catch the eventual crossover (sort of).
        • Season 5 (1997-1998)
          • Mythology:
          • Extras: Bad Blood (vampires + unreliable narrators), The Post-Modern Prometheus (Frankenstein hommage, shot in black-and-white)
          • Film 1: The X-Files: Fight the Future (1998)
            • When to watch:
            • How it went down: Made $189 million on a $66 million budget, not too shabby. Rotten Tomatoes sits at 66% (critics) and 73% (audience), so most agree it's a decent outing.
            • Season 6 (1998-1999)
              • Mythology:
              • Worth a peek: Triangle (one-take time travel shenanigans), Monday (Groundhog Day meets FBI debts)
              • Season 7 (1999-2000)
                • Mythology:
                • Millennium crossover: Season 7, episode 4 is literally titled 'Millennium' and wraps up stuff from that show.
                • Season 8 (2000-2001)
                  • Mythology:
                  • New faces: Agent Doggett joins, Mulder's off getting abducted (again).
                  • The Lone Gunmen (2001): Ran 13 episodes, aired during X-Files Season 8. Not essential for the main plot, but there is a tangential crossover leading into Season 9.
                    If you’re some kind of completionist: Watch S8 up to episode 11 ('The Gift'), then alternate between The Lone Gunmen (first 6), S8 episodes 12-15, pop in Lone Gunmen episode 7, then back to S8 episode 16. After that, finish both in whatever order suits.

                  That’s the proper lowdown for anyone who hates filler and wants the straight shot through the show’s tangled alien web. Reminder: if you’re after every in-joke, arc detail, and all of Carter’s TV universe, there are even more connections and oddities to dig up, but if you stick to the list above, you’ll have all the essentials and a few curveballs that make The X-Files the oddball classic it is.