Sometimes, the writers of the show want a Story Arc's ability to tell a longer story, but also want the flexibility afforded by a more episodic structure. The answer to these is the Half-Arc Season. Each season has its own Story Arc but the majority of the episodes in the season are one-part standalone episodes. The arc is mostly separated out to the first few episodes of the season (to set it up) and the last few (to resolve it), with a few that push forward the greater storyline while still telling their own story sprinkled about in the middle. Note that seasons mostly devoted to an arc can still have the occasional standalone in them; it's when the majority of episodes are non-Arc that this trope applies. Usually, this is midway in Season Fluidity. When a Season alternates between two major arcs, the arcs are said to Rotate.
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Anime and Manga
- Ghost in the Shell: Stand Alone Complex; in this case, the Title Card of each episode would be marked 'Stand Alone' or 'Complex' (Arc-based). The second season went even further, with two arcs running simultaneously - "Individual" episodes tie into the first arc, "Dual" episodes with the second, and "Dividual" episodes were stand-alone.
- Despite really only having one Story Arc, Cowboy Bebop still fits this trope.
- Black Lagoon's layout contained 2-3 episode mini-arcs within both seasons (the Nazi arc, the Roberta arc, and the Triads and Terrorists arc from Season 1, as well as the Vampire Twins and Greenback Jane arcs from Season 2). Season 2, however, also featured the six-episode endgame "Fujiyama Gangster Paradise" which took up the other half of the whole series. The next arc, "El Baile De La Muerte", ended up being so long and continuous that it was adapted into an OVA series instead of a season.
- Approximately the first 15 or chapters/episodes of Soul Eater follow this pattern, mixing together introductions, Monster of the Week episodes, Breather Episodes, and a recurring plot involving Medusa and Crona. From the anniversary party onward, it's pretty strictly serialized.
- The first ten or so episodes of SD Gundam Force were stand-alone, the first major arc not starting until "The Mystery of Lacroa". The second season was entirely arc-based.
- Some seasons of Stargate SG-1, especially the last four.
- Veronica Mars, two ways. Its first two seasons, though technically full arc seasons, had a lot of Mystery Of The Week with little or no movement on the season-arc story. Its third season had two distinct shorter arcs, one six episodes long, with beginning, middle, and end; and the second nine episodes long. The last five episodes of the season are standalone (excepting the last two episodes, which were aired together). The advantage, in a show like VM, is that some of the Mysteries of the Week can actually be key revelations in the arc, but this fact is not obvious until the end of the episode.
- The Battlestar Galactica did this though they leaned more towards every episode being part of the arc. The Season finale/premiers and the mid-season two-parters usually had some kind of game-changing event and the episodes after that were mostly stand-alone, exploring the results of those events and their effects on the characters while only prodding the story along.
- The Doctor Who revival series are leaning more and more towards this format as time progresses:
- In series 1, time and time again Rose and the Ninth Doctor encounter the words "Bad Wolf", but have no idea what they could be referring to. An episode midway through the season then sets the stage for the two-episode season finale where the reason behind the appearance of the Bad Wolf phrase is revealed.
- In series 2, a majority of the episodes are standalone, though again midway through there are two episodes which set up and foreshadow the events of the season finale.
- In series 3, almost every episode slyly introduced a Chekhov's Gun that would be fired in the three-part finale: the Timey-Wimey Ball in "Smith and Jones" and "Blink", the chameleon arch in "Human Nature", Dr. Lazarus' experiments in... well, "The Lazarus Experiment", Mr. Saxon and the government keeping tabs on Martha in "The Lazarus Experiment" and "42", the Face of Boe's message in "Gridlock", and the power of words in "The Shakespeare Code".
- In series 4, all of the episodes seem very episodic, with seemingly unconnected references. Then the finale comes, and suddenly nearly every episode was part of the story arc. It goes further, bringing in characters and events from all three seasons and the spin-off series, all of which were mostly standalone up until then.
- Series 5 and 6, in which starting with the first episode of series 5, Silence is mentioned. The Doctor and Amy run forth on their adventures not giving a damn about the mention of Silence or anything else. Several times throughout the series we hear about the Silence, but our focus is drawn more towards the CRACKS IN TIME. Enter series 6 which features a religious order opposed to the Doctor called the — (surprise surprise) Silence! Joining this is the wonderful question that cannot be answered: Doctor Who?
- Buffy the Vampire Slayer and Angel, Buffy in particular.
- The last two seasons of Star Trek: Deep Space Nine, as well as the third season of Star Trek: Enterprise.
- A couple of Deep Space Nine episodes in the sixth and seventh seasons played with this trope: it appeared at first that they were standalone episodes not part of the Dominion War arc, but then the Dominion would show up unexpectedly and it would turn out to be part of the arc after all. A good example is "One Little Ship".
- Seson Two of Blake's 7 has a story arc that is mentioned in passing during the third episode and kicks off with the fifth and sixth episodes before getting partially sidelined until it becomes the center of attention in the last three episodes.
- Burn Notice. Generally, a standalone mission takes up most of the screen time while the burn-related investigation gets only a few scenes scattered throughout the episode. Arguably, most episodes move the arc along a little, but it moves so slowly you could probably miss a couple episodes and still figure it out pretty easily.
- You can. Especially since most of it ends up being dead ends and the important bits are always repeated anyway.
- Supernatural follows this pattern.
- Smallville does things this way.
- In the third season of Bones, this tactic was employed. The Gormogon arc was often made of awesome, but if you know how it ends it can be deeply unsatisfying, as the arc was cut short by the writer's strike and ended with an Ass Pull of epic proportions.
- Leverage attempted this with its third season, but due to availability, odd timing, lack of scripts, etc. there was only one truly arc important episode between the premier and the finale, with some small hints thrown in here and there. Word of God states that these were meant to be spread out more, but shooting schedules clustered them into the back third of the season.
- Tokusatsu shows go with this if they're meant to last a season. The Monster of the Week will still be sent by the Big Bad but otherwise unrelated and the overarching plot will be touched on in the beginning, the end and a few episodes in between. This carries over to Power Rangers as well.
- This is most notable in Kamen Rider, where the Monster of the Week becomes the Monster of the Fortnight, dragging what would have been a one episode plot into two episodes, which either benefits or cripples the pacing Depending on the Writer.
- Fringe generally has arc episodes at the beginning of the season, around the half way point (episode 10 and 11), during sweeps (15 and 16) and ending with a big finale. The rest of the episodes are "Freak of the Week" deals.
- Chuck does this. Though the show does try to add plot points for the major arc in every episode, some of them are mostly self-contained.
- The X-Files was particularly famous for this, and the fandom still rages over whether it was better with the arc or without the arc and debates over what episodes count as arc related (generally, arc related episodes featured characters like The Lone Gunmen, Th Cigarette Smoking Man, Deep Throat, and Mr. X, and Alex Krychec) but several one-shot episodes featured them as well. The most debated is "Musings of a Cigarette Smoking Man" which was entirely based on the alien arc and showed a scene that was said to have happened before the series started, but added nothing to plot otherwise, and is even hinted at being false at some points.
- While most Glee episodes are fairly stand-alone, there is the larger arc about the group preparing for competitions (Sectionals, Regionals, Nationals) which strings each season together.
- Castle, starting in the second season. Individual episodes are almost always independent. Occasionally, however, one will end up touching on the larger issue of Beckett's mother's murder, sometimes very tangentially (X crime is committed in an attempt to get Y to happen so the Big Bad can go after Beckett) or very directly (the case just happens to bring Beckett face to face with her mother's killer).
- CSI has had several multi-episode arcs, but the one clear-cut example of this trope would be Season 7, in which the Miniature Killer case was the main focus of about half a dozen episodes and was also alluded to in several others. Season 11 might count as well, though some fans think of it as a regular season that got infested by a Plot Tumor.
- In general, CBS seems to have mandated some version of this for all their drama series. Most of the older ones (The CSIs, Criminal Minds, NCIS) contain the arcs to a single season. Several shows (The Mentalist, NCIS: Los Angeles, Hawaii Five-0) have constructed a single series-long half-arc.
- Arrow has a format of a main story set in the present, and another from Oliver's five years away, viewed via flashback:
- Season 1: The flashbacks show Oliver first arriving on the island, and being entangled in the conflict with Edward Fyers' mercenaries. The present day story shows Oliver first returning to Starling City, becoming the Arrow, and slowly uncovering the Undertaking conspiracy.
- Season 2: The flashbacks show the conflict between Oliver and his friends on the island and Dr. Ivo, which led to Slade's Face-Heel Turn. The present day story is about Oliver trying to move from being a vigilante to a true hero, while facing Brother Blood and Slade.
- Season 3: The flashbacks show Oliver's time as an ARGUS agent in Hong Kong. The present day story is about Team Arrow being caught in the middle of a war between Malcolm Merlyn and Ra's Al-Ghul.
- The flashbacks on The Flash (2014) don't have a half-arc themselves, but the show otherwise follows it's parent series, Arrow's format with Barry fighting Monsters of the Week with a slowly building season long plot orchestrated by his mentor figure Harrison Wells.
- The first season of Lost Girl is heavily monster-of-the-week, with little tidbits to move the larger mystery of Bo's parentage forward, with the occasional arc-heavy episode.
- Justified: While Seasons 2, 3, and to a lesser degree, 4, are almost entirely serialised, Seasons 1 and 5 follow this pattern. Season 1 has Raylan and Boyd pursuing their own agendas, until Bo's release from prison kicks off the final arc, while Season 5 has Boyd engaged in a serialised storyline, while Raylan deals with villains of the week; their storylines eventually collide in the backhalf of the season.
- Seinfeld had arcs in seasons 4 and 7. The former finds Jerry and George trying to create a TV pilot for NBC, and the latter sees George getting engaged to his ex Susan, then desperately finding ways to break up with her.
- Z Nation: Most of the episodes help to develop at least one character's backstory, but the Myth Arc revolves pretty firmly around Murphy. Of the 13 episodes in the first season, only 6 move his story forward.
- South Park:
- Season 6 had most of the episodes deal with Butters and Tweek as Kenny's replacements, and later Cartman being possessed by Kenny's spirit.
- While they have different plots, most of the "non-issue" episodes in Season 4 tended to revolve around Cartman's various attempts at getting $10 million. In Season 12 it's the boys' gradual discovery of their unpopularity.
- Season 18 focuses on Randy's Secret Identity as Lorde, hinted at (in that Randy dressed as Lorde) in "Gluten-Free Ebola", confirmed in "The Cissy", and wrapped up in "#REHASH" and "#HAPPYHOLOGRAMS"
- Each season of Teen Titans except for the entirely arc-based fifth season, where a flashback origin story episode was the only one not related to the current world-travelling plot at hand.
- Jackie Chan Adventures. Season 2 especially is notorious with this. The stand-alone episodes put together were longer than any of the other seasons.
- Transformers Animated follows this format to an extent, particularly in the first season. Season 2 has some random, AllSpark-related hijinks between important episodes, but they were usually still related to the plot in some way, with the Blue Racer being a prime example.
- The first season of The Secret Saturdays did this.
- Spider-Man: The Animated Series in its second, third, and fourth seasons. All of them had their own subtitle with the actual episode titles treated as chapters of it, but all had their share of standalone stories as well.
- The first season of W.I.T.C.H. has the heroes going through a main standalone plot for each episode combined with scenes of the villains that advance the Myth Arc. The second season was a much more ongoing plot each episode.
- Ben 10 was like this, with the majority of the episodes being standalone but a handful advancing either the seasonal arc or the overall Myth Arc about the Omnitrix.
- Avatar: The Last Airbender did this in its first and third seasons. Season 2 had only a few self-contained episodes, and they were more important for tying up loose threads left over from the previous season.
- My Little Pony: Friendship Is Magic
- Season One has an arc following the Mane Six preparing for the Grand Galloping Gala in Canterlot, but every episode was also able to stand alone, including the arc episodes. Disregarding the two-part series premiere, the opening and closing episodes also stand as Bookends.
- Season Three contains the final, critical steps of Twilight Sparkle's journey to becoming an alicorn princess, in addition to traditional slice of life episodes.
- Season Four's main arc starts with the end of the two-part premiere, which introduced a mysterious box with six locks after Twilight sacrificed the Elements of Harmony, and is resolved in the two-part finale. The keys found over the course of the season are mementos from ponies of the day when they and a mane character learn the same lesson about friendship. The season also has a secondary arc (started in the previous season) leading up to the Equestria Games, which take place just before the finale. As usual, there are plenty of Slice of Life episodes in between the arc episodes.
- The second season of The Avengers: Earth's Mightiest Heroes has the Skrull Invasion arc, which takes up the first half of the season. Once that ends, the season has a lot more standalone episodes, with some episodes that ties up previous loose ends thrown into the mix as well.
- Any episode forces on the history of Franz Hopper in Code Lyoko until the final four episodes of Season 2 — "Franz Hopper", "Contact", "The Revelations, and "The Key" where become to story becomes the Main Arc.
- Each season of Wakfu has its own story arc and Big Bad, but most episodes are filler apart from the beginning, middle, and end of each season.