Also known as a "series" in the UsefulNotes/UnitedKingdom. These tropes are all about how a [[{{Series}} television series]] and its {{story arc}}s can be laid out episode to episode, and season to season.

Also see {{Episodes}}. Not to be confused with SeasonalIndex, which is about the actual seasons of the year.
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!!Tropes:

[[index]]
* TwelveEpisodeAnime: An anime show that intentionally lasts only twelve episodes.
* AbortedArc: An ongoing storyline is abruptly dropped and never resolved.
* ArcWelding: The stories of a previously episodic show are retconned to be part of one overarching story arc.
* BritishBrevity: The tendency for British shows to be short (in comparison to American shows).
* FinaleSeason: The last season of a series, which comes with a conclusive story arc to wrap up everything.
* FiveEpisodePilot: The series begins with a multi-part episode.
* Front13Back9: The first 13 episodes of a series' first season are more self-contained because the last 9 hadn't been ordered yet.
* HalfArcSeason: A series alternates episodes between those that advance its story arc and those that are mostly unconnected.
* LayoutOfASeason: The kinda StrictlyFormula structuring of a show's seasons.
* MidSeasonTwist: An episode which serves as a climactic moment during the middle of the season's story arc.
* MiniSeries: A TV series which was intentionally produced to only run for a single season.
* MythArc: A story arc that spans the entire series.
* NotSoEpisodic: A show's story appears to be episodic, but is revealed to actually have been part of a wider MythArc all along.
* PostScriptSeason: A show gets renewed for more episodes after it was supposed to end.
* RotatingArcs: A season following two or more separate story arcs at once, with little to no overlap.
* SeasonFinale: The last episode of a specific season, (usually) concluding that season's story arc.
* SeasonFluidity: Some series can be watched in any order because nothing changes over time, whereas others must be viewed in order to understand what's happening.
* SeasonalRot: The opinion that a show has declined in quality because it's lasted way too long.
* SecondSeasonDownfall: A show's second season is so poorly received it doesn't get a third.
* SophomoreSlump: A show's second season is seen as a letdown, but things pick up again in the third season.
* StoryArc: A storyline that takes multiple episodes to resolve.
* SynchronousEpisodes: Two different episodes of a show taking place at the same time.
[[/index]]
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