Examples of live-action television shows [[CerebusSyndrome getting progressively more serious.]]

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* ''Otasuke Girl'' was a short DTV Japanese series about a superpowered high school detective girl. While most of the episodes were very lighthearted, featuring humorous recurring characters, bad guys who were more silly than threatening, and the title character using hilarious fighting techniques like hitting her opponent's face with her butt while shooting 'hip punch!', the series finale featured little to no humor, with a story about children's disappearance and Otasuke Girl being put in a coma. Even if all went back to normal at the end, ending this lighthearted series on such a dark episode gave a really weird feeling.
* ''Franchise/SuperSentai'' seems to be more lighthearted for the first 10 episodes while we get to know the characters before getting more arc based and dramatic after the story kicks in. Since new series start without so much as a week's break after the last one, this run of lighthearted episodes may count as a BreatherEpisode after how serious the last ten episodes of a series seem to get. In another way, looking at the series as a whole, it seems to waffle back and forth between each season. The serious [[Series/ChourikiSentaiOhranger Ohranger]] was followed by the lighthearted [[Series/GekisouSentaiCarranger Carranger]]. Similarly we went from silly Go-onger to serious [[Series/SamuraiSentaiShinkenger Shinkenger]] to silly [[Series/TensouSentaiGoseiger Goseiger]]. It seems like the creative team just like going back and forth with it.
* ''TheIncreasinglyPoorDecisionsOfToddMargaret'' begins as your typical CringeComedy, with Todd falling deeper into a [[FawltyTowersPlot web of ridiculous lies]], ultimately [[spoiler:exposing an entire restaurant to a deadly virus, triggering a terrorist attack that kills the female lead, and being extradited to North Korea.]]
* ''Series/FamilyTies'' was the trope codifier for the "Very Special Episode", featuring a pre-''Philadelphia'' Tom Hanks playing a drunk who comes within a hair of slugging MichaelJFox's Alex (in 1982; [[OlderThanTheyThink go figure]]). Fox later netted an Emmy for "A is For Alex", in which his friend is brutally killed by a speeding car during an errand Alex was ''supposed'' to be helping him with, but weaseled out of at the last minute. Plagued by survivor's guilt, Alex has a nervous breakdown and goes to see a clinical psychiatrist(!). This episode, along with the show's many imitators during this period, was a major motivating factor for the "no hugging, no kissing" sitcoms of the modern era.
* ''Series/{{MASH}}'' is probably the most famous (or infamous) TV example of the trope. It started as early as midway through the first season with the episode "Sometimes You Hear the Bullet," which can be called the first time in the series that the concepts of war and death are looked at in a very serious light, as opposed to the more light-hearted and comedic situations of the previous episodes. And the season 3 finale "Abyssinia, Henry" is often considered the first instance of a major sitcom character actually being killed off in American TV history. While the show never abandoned comedy entirely, by around season 8 or thereabouts the balance had shifted decidedly in favor of increasingly heavy and {{Anvilicious}} drama.
* The first couple seasons of ''Series/{{Smallville}}'' were mostly lighthearted freak-of-the-week affairs. Around the middle of season three, they began to delve more into the {{Superman}} mythos, and the show reflected this.
* ''Series/BuffyTheVampireSlayer'' started its Cerebus transition after the end of the first season. It's [[BrokenBase frequently debated]] on the point where it went [[AngstDissonance too far]], though the sixth season is the most commonly accused.
* ''Series/{{Angel}}'' went through Cerebus Syndrome, starting life as a supernatural detective story but very quickly transitioning into multilayered plot arcs about conflicts between interdimensional forces of good and evil.
* The second season of the Argentine soap ''Rebelde Way'' took a turn toward darker storylines.
* ''Series/{{Supernatural}}'' underwent this process when it hit the halfway point of Season One. And it got even worse from there. With BreakTheCutie and DeusAngstMachina.
* ''Series/{{Friends}}'' has a subtle process in this vein. It starts out with story arcs entirely for comedy, actual jokes with punchlines, and a set of characters that seem to fulfill every comedic need you could have. Then heavy character development and serious storylines set in and eventually the series becomes straight {{Dramedy}} rather than Comedy with bits of Drama.
* ''Series/SexAndTheCity'': Started out as being about sex and dating and all the various types of men out there, then starting in Season 3 shifted focus to long-term relationships. Really set in in season six, which had arcs dealing with Charlotte's infertility and Samantha developing breast cancer. The last several episodes and [[TheMovie the movies]] were considerably less light-hearted than the early seasons.
* The French comedy show ''Series/{{Kaamelott}}'' starts as a short comedic series spoofing the legend of King Arthur, but after three seasons, the storyline became darker and less comedic (except for the two comic relief characters of Perceval and Karadoc) and turned to get an actual (twistful) plot, while doubling its air time to 7 minutes length.
* ''Series/{{Weeds}}'' began as a comedy (or dramedy) about a housewife dealing marijuana in the suburbs; from the second season on, though still possessing a lot of bizarre and quirky humour, it became a lot more serious. The show began dealing with increasingly dark themes till it started CrossingTheLineTwice. By season 6, it inverted Cerebus Syndrome and turned into a farce.
* ''Series/SheSpies'' is a syndicated show (it aired on {{PAX}} for a while) that was originally a spoof of ''Series/CharliesAngels'' and the like. In its first season, it took shots at everything, and the leads were {{Deadpan Snarker}}s. In the second season, the show dropped most of the humor and became what it had spoofed.
* The first two seasons of ''Series/XenaWarriorPrincess'' were heavy on camp and occasionally had a serious episode. Then [[spoiler:Gabrielle was killed for the first time]] in Season Three, setting off a season-long storyline meant to put Xena and Gabrielle through emotional hell. Subsequent seasons had even less comedy. A notable episode is The Convert where normally goofy Butt Monkey Joxer [[spoiler:kills for the first time.]] Throughout the episode he is not joked about and engages in no goofy antics, despite obvious setups. Even in the fight scenes.
* ''TheFreshPrinceOfBelAir'' started off as a lighthearted comedy about the young, funky, foul-mouthed Will Smith living with his rich, stuffy relatives in Bel Air. The series went on to explore increasingly controversial topics, like racial discrimination ("Mistaken Identity"), fatherhood and abandonment ("Papa's Got a Brand New Excuse"), gun violence ("Bullets Over Bel-Air"), alcoholism ("You've Got to Be a Football Hero"), and even drug use ("Just Say Yo"). The later episodes included several "serious moments" where actor Will Smith cries, screams, or breaks down. There was often no laugh track to end the show, opting instead for a somber, silent cut to the credits.
* Since its fourth season, ''Series/{{House}}'' has become more and more focused on character drama and less on the weekly patient. Whereas subplots involving relationships usually only occupied a few minutes of an episode, which was instead focused on Greg's hilarious antics or the central plot of the patient, that is now almost entirely reversed. Patients are usually only treated for a brief portion of the episodes, and even those scenes are flooded by character drama.
* ''Series/TheThickOfIt'' went through this, partly because of changes in the RealLife political climate it reflects, and partly because of its own fractured production history. As the UK went into recession, news of the [[http://news.bbc.co.uk/1/hi/uk_politics/8039108.stm MPs' expenses scandal]] broke, and [[UsefulNotes/BritishPoliticalSystem New Labour]] began losing their grip on power, the storylines in the show's third series became less comedic and more dramatic. The third series was also the first complete series commissioned by the BBC (the other episodes had been pilot episodes, short runs or hour-long specials) and gave the writers their first chance to toy with story arcs, resulting in the the third series being much less episodic than the first.
* A season 3 episode of ''{{Warehouse 13}}'' had supernatural twists on torture by burning and waterboarding; pretty dark for that show.
* The second season of ''YoungDracula'' has shades of this, what with [[spoiler:multiple vampires actually getting slayed, including one who had been a recurring sympathetic character, Vlad being revealed to the TheChosenOne, and the series ending on what was probably meant to be a dramatic cliffhanger.]] Unfortunately, the set-up in the first season was so bizarre that it never quite worked (the constant SpecialEffectsFailure didn't help). The first series was more of a vampire pastiche/parody with a lot of silly humour, which worked a lot better.
* After pressing the ResetButton so hard it broke at the beginning of Season 3, ''Series/{{Chuck}}'' seems to be slowly heading down this path as the separate worlds the titular character has maintained over the course of the show (Spy world and Buy More world) seem to be slowing collapsing into one another, with potentially unpretty results. It seems that [[StatusQuoIsGod Status Quo is still God]]. (Except for what happened to Emmett, but the first episode of a new season can sometimes change the status quo.) Spy world and Buy More world are still separate so far - there's just a lot more angst and trauma about it. For ''every''one.
* ''Franchise/PowerRangers'' got this in ''Series/PowerRangersInSpace''. Where previous seasons had the Rangers defend the city from goofy MonstersOfTheWeek, ''In Space'' had their mentor kidnapped and they were desperately searching alien planets to find him before time ran out. The bad guys were also more complex characters than the {{Card Carrying Villain}}s that were present up to that point, and it even wrapped things up with a BittersweetEnding. The result is that ''In Space'' is considered one of the best seasons by the fans, and it got enough ratings to [[UnCancelled uncancel]] the franchise.
* This definitely happened to ''BoyMeetsWorld'' in the later seasons. Around the kids' senior year of high school, it went from being a light-hearted comedy about puberty to being more or less a Dramadey with a lot of angst, inner turmoil and VerySpecialEpisodes. It never did lose its 4th-wall leaning, LampshadeHanging charm, though. The tone shifted as early as Season 2, when they brought in Mr. Turner and Topanga went from 'weird kid' to 'viable romantic option'.
* ''Series/{{Life On Mars|2006}}'' was fairly consistent in its [[MindScrew Mind Screwy]]-but-occasionally-light-hearted tone. ''AshesToAshes'', on the other hand, started out similar to its predecessor, but [[GrowingTheBeard grew the beard]] with its Season One finale (which revealed that [[spoiler: Alex's father had pulled a TakingYouWithMe, killed her mother, and the only reason young Alex survived was chance, not to mention the man who took her hand afterwards was Gene Hunt]]). And did it again with its season 2 finale (involving [[spoiler: a fellow "time-traveler" killing his own younger self and setting Alex up to take the fall, Gene accidentally shooting Alex, and Alex waking up in 2008 only to start seeing Gene on her television]]). Season 3 upped the ante [[FauxSymbolism into pseudo-religious]] [[AnyoneCanDie levels]], capping it off with revealing [[spoiler: EveryoneIsJesusInPurgatory and [[{{Satan}} the Devil]]'s been hanging around this whole time]].
* ''{{Blackadder}}'' did this [[MoodWhiplash very suddenly]] with the tragic finale of the fourth series. Interesting, because the first and second series ended with everyone dying. In those occasions, it was inevitably played for laughs, making the end of ''Blackadder Goes Forth'' particularly striking.
* ''Series/{{Farscape}}'' started off as a FishOutOfWater human-stuck-in-space series with a lot of comedy and some rather astute drama subplots. And then [[DarkerAndEdgier it got darker]], and [[FromBadToWorse darker]], and those dramatic subplots became featured with MindScrew... and finally by the PeaceKeeper Wars you have... er... well... [[http://www.d2o2.com/pics/galaxy/index.html this. See entry number 3]]. However the entire slide from: comedy -> drama emphasis was [[ConspiracyTheorist too well written to be a accident]], and the show kept GrowingTheBeard.
* ''Series/{{Poirot}}'' series, after season IX, saw the deletion of regular comic relief characters like [[TheWatson Captain Hastings]], and inclusion of more serious, "dark" themes.
* ''Series/ICarly'': The episode ''iOMG'' is the first of a five episode 'arc' involving the Sam/Freddie [[AbuseIsOkayWhenItsFemaleOnMale 'romance']]. The first promo from the 2nd episode is void of comedy, and instead concentrates on kissing, and Sam wondering if she has 'lost her mind' for liking Freddie.
* Notably averted by ''Series/{{Seinfeld}}''. Despite being on the air for almost a decade, it never slid into drama. Not even a VerySpecialEpisode. Even the series finale was all comedy.
* ''TheJob'' started out as somewhat black comedy, but over the course of the series morphed into something very much like its SpiritualSuccessor ''RescueMe''.
* ''Series/EightSimpleRules'' had the premise of lighthearted family DomCom with emphasis of an overprotective father toward his offspring at first, but only for roughly one season. Afterward (most notably due to the death of the actor of the father), this trope set in and this show became more dramatic.
* ''Series/HowIMetYourMother'' has began limping down this path to some degree, with [[spoiler: the death of Marshall's father or Robin's infertility]] and as a means to extend the popular series. It gets hiked ''way'' up in mid-season 7 with episodes like "Tick Tick Tick", "Symphony of Illumination", and "The Drunk Train", which are as rife with drama and sad moments. The syndrome is somewhat lightened by the fact that the HappilyEverAfter ending (with everyone staying close friends, Marshall and Lily staying together, and Ted marrying and having kids) has been a ForegoneConclusion since the pilot. The only truly dramatic tension is [[WillTheyOrWontThey whether or not Robin will get her happy ending with Barney]], and even if she doesn't, Future!Ted has confirmed that Robin still had a wonderful life and was always surrounded by her friends.
** Then Back with revenge in the series finale, [[spoiler: After one season spent with the marriage of Barney and Robin, we learns that they divorced three years later which cause Robin to distance with the gang. Ten yars after Ted met his wife, she dies from an illness. It turns out the entire story was Ted explaining to his children that he can move on and go back with Robin.]]
* ''GreenWing'' started out as a light-hearted, surreal comedy, and partway through season two turned depressing with [[spoiler: Mac's terminal illness]] and [[spoiler: the suicides of Statham and Joanna]].
* ''Series/{{Glee}}'' started off with really lighthearted humor and was almost a parody of the Musical genre. However, during the second season the storylines have become more and more serious. By Season 5 the show has come full circle and now parodies itself.
* ''Series/{{Scrubs}}'' was never supposed to be a blatant humor show, and had always shown signs of seriousness, but the last 3 seasons with the main cast really took the darkness up to 11. With JD's romantic story lines getting more and more tragic, his son, Turk and Carla's marital problems, Dr. Cox's ever growing problems leading up to several break downs, and plenty of death to go around, ''Scrubs'' ended as way more of a drama than a comedy.
* While the first season of ''Series/{{Community}}'' had its darker moments, it was generally episodic and consequence free. The second season noticeably changed tone, especially with Pierce becoming a downright villain in several episodes ("and then I rape the Ducane family" anyone?). Even [[LampshadeHanging lampshaded]] by Abed ([[GenreSavvy of course]]) and several others dropping various comments like "this has been a dark year". And the third season? Can anyone say "[[BeardOfEvil darkest timeline]]"?
* ''Series/BreakingBad'' remains as darkly humorous as it always was, but it manages to use this trope by making the main character less and less sympathetic in each season. As Walt becomes corrupted by the drug trade, the tone of the show becomes even darker and more tragic than it was in seasons past, feeling more like a modern Shakespearean tragedy by the conclusion. It has become so well known for this trope that TheOnion [[http://www.theonion.com/articles/breaking-bad-creator-thinking-maybe-next-season-sh,29445/ even ran a parody article announcing that the show will take "a dark turn" in its forthcoming season (in contrast to the "lighthearted" tone of the show up til now)]].
* ''Series/HogansHeroes'' is an interesting case of this. While it never ''stops'' being a comedy, later scenes play up the dangers the heroes face considerably. The difference between how the Gestapo and SS are treated in Season 1 (a nuisance) and Season 6 (an actual threat) is especially jarring if one re-watches the early episodes after the later ones.
* ''Series/BuckRogersInTheTwentyFifthCentury'' became much more serious in the second season. TheUnfrozenCaveManLawyer aspect of Buck's character had run its course by the end of the first season. Gone were his constant humorous references to the 20th Century (i.e teaching the people of the 25th century how to "get down"). The "Disco Era" feel and look of the show also abruptly disappeared with the change of setting to outer space. Also, Ardala and the Draconians were now friends of Earth. So gone was the serio-comic sexual tension. Buck was no longer a swinging ladies man who cracked jokes while fighting. It was evident that Buck now took his relationship with Wilma Deering seriously as he should have done from the start. No longer being a quirky maverick prone to setting out on his own, he became a more serious team oriented character who just followed orders from TheCaptain. Even TWIKI was no longer a goofy sidekick and not only did he become more grumpy, but he also lost his signature speech impediment. He had a different voice to reflect this. Also, in keeping with the new WagonTrainToTheStars style format, there were no more SpaceBattle scenes. There were also fewer [[BigBad outright villains]], most episodes revolving around mysteries instead of conflict. Also, Buck became more preachy (his very serious sermon in ''Time of the Hawk'') as well as angsty when problems couldn't be solved without violence.
* ''Series/{{Skins}}'' started out as a fairly balanced comedy/drama that dealt with real life issues college kids go through with respect and realism, while still having whimsical larger than life side characters and plenty of funny moments to keep the overall tone enjoyable. Generally every season got a bit darker towards the end, and the second season for each generation of cast was always darker than the first. Generation 2 was a lot darker than Generation 1, though they lightened up just a little for Generation 3, at least ending in an upbeat fashion. Then came the grand final Season 7, which revisited some of the previous characters dealing with some very heavy adult life issues. When you think back to the wacky funeral coffin-stealing car chase of Season 2's finale, it's hard to believe it's the same show that saw the final episode of Season 7 be a tense comedy-free finale of protagonists being chased through the woods by a crazed gunman. So you've got layers of Cerebus Syndrome over the course of individual episodes, seasons, generations, and the series as a whole.
* ''Series/WarOfTheWorlds'' started off as a science fiction adventure show with a [[FiveManBand team of specialists]] on a mission to fight alien invaders. The team included the usual lineup, TheLancer who was also TheBrigadier, The wisecracking BlackBestFriend who was also the PlayfulHacker, TheChick and her [[KidSidekick daughter]], all led by the SmartGuy who was also TheWonka and {{Pacifist}}. Colonel Ironhorse was the StraightMan of the team and ButtMonkey because of it. The second season, however, did away with Cololnel Ironhorse and Norton Drake. Harrison Blackwood lost his sense of humor, his quirkiness, and his pacifism. They gained AntiHero John Kincaid. Suzanne goes from being a feminist, single mom career woman to an EmptyShell. Debi becomes more {{Emo}}. The world became a {{Cyberpunk}} dystopia.
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