There are 218 episodes of The X-Files across 11 seasons, along with two feature films. Plus, there’s the single-season The Lone Gunmen spin-off to consider. For the real die-hard Chris Carter fans, there’s even Millennium, which isn’t actually a spin-off, but often gets lumped in due to its crossover episode. How can you possibly navigate the show’s essential mythology episodes? What even is The X-Files mythology?

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