|conspiracy episode (in XF)
|Story Arc, Monster of the Week
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Mytharc stands for "mythology arc" and refers to the central storyline of a series. The term was coined by the creators of The X-Files and was used by fans when discussing elements that were part of that central storyline. Since then has been adopted by many fandoms, e.g. in Supernatural fandom for the central demon storyline.
Episodes that dealt with those central elements or introduced a new piece of the puzzle were called "mytharc episodes." In X-Filrs the two-parters Colony/Endgame and Tunguska/Terma are considered mytharc episodes because they are part of the bigger picture and not just a Monster of the Week.
- Mytharc (X-Files) tag on the Ao3
- Myth Arc article at the TV Tropes wiki
- Wikipedia:Mythology of The X-Files