History MoralEventHorizon / LiveACtionTV

* ''Film/PerfectAssassins'': Greely crossed it in the backstory, when he started his Skinner box experiments on a young Ben Carroway, then framed Ben's mom when he's caught.

* ''Series/{{Revenge}}'': In season three, Daniel Grayson confirms that he is indeed his father's son [[spoiler: by shooting Emily in the stomach in a drunken rage ''not long after they get married'' and sending her over the deck of the yacht to drown. She survives, but now she can never have children]]. By the middle of the fourth and final season, he [[HeelFaceTurn proves himself far better than Conrad]] and in the process, [[spoiler:[[HeroicSacrifice dies saving Emily's life]] from a terrorist's daughter]].

* ''Series/{{Scandal}}'':

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* ''Series/The100'':
** Finn kills [[spoiler:several Grounder prisoners. He's sort of regretful about it but still hates the Grounders. Eventually, he accepts his guilt and allows himself to be executed.]]
* ''Series/TwentyFour'': Several characters cross it, even when they're not intending to. In fact, an alternate name for the show could be "Moral Event Horizon: The Series". It's a very long list:
** Season 1 villains: Kevin Carroll crosses it by [[spoiler: smothering Janet York to death.]] Andre Drazen leaps over the horizon by [[spoiler: killing a hostage after Jack has already complied with his demands]], and finally, [[spoiler: if his father Victor didn't cross the horizon while he was a warlord, he most certainly crossed it by killing his friend's daughter without hesitation or remorse when Jack takes her hostage.]]
** Season 3: Ramon Salzaar [[spoiler: shooting his brother Hector for not going along with a deal.]]
** Season 4: Dinah Araz [[spoiler: coldly poisoning an innocent teenage girl.]] It's the smiling and talking over family photos [[spoiler: while Debbie unknowingly drinks the poisoned tea]] that sends her over, and though she attempts a HeelFaceTurn afterward, [[spoiler: she gets a KarmicDeath instead.]] Her son Behrooz, [[spoiler: the subject of a prominent WhatHappenedToTheMouse]] follows her right across the line by still following her orders despite clearing knowing she's crossed the MEH.
** Season 5: Christopher Henderson likely already crossed the horizon before he even appeared on-screen by [[spoiler: ordering the murder of David Palmer and Michelle Dessler.]] If not, then he seemed to do so [[spoiler: via his implied murder of Evelyn Martin and her daughter.]]
** Season 6: Abu Fayed [[spoiler: detonating a nuke that kills many thousands of people]], Graem Bauer [[spoiler: either by his involvement in Day 5 or his confessed multiple attempts to murder Jack]], Philip Bauer [[spoiler: either by murdering Graem to cover his tracks or threatening to murder his grandson Josh]], and Cheng Zi [[spoiler: by torturing Audrey Heller for no other reason than to spite Jack and use her against him.]]
** Season 8: Charles Logan [[spoiler: by corrupting Allison Taylor to redeem his public image]], and [[spoiler: Yuri Suvarov, for orchestrating the day's events, particularly the murder of Omar Hassan and Renee Walker.]]
** Up until the finale of the first season, [[spoiler:Nina Myers]] seemed - at best - to be someone with muddled loyalties. Even when it was revealed in the previous episode that she was [[spoiler:Victor Drazen's contact in CTU (and was thus responsible for tipping the assassin off to the safehouse where Teri and Kim were staying)]], she still wasn't overtly bad. That changes in the span of the finale, though, when it's revealed that she [[spoiler:not only slit Jamey Farrell's wrists while the latter was handcuffed to a chair but goes on to shoot and kill Teri Bauer (who just revealed to her that she was pregnant), despite not having any real reason to]]. Even though the writers tried to humanize her in the next two seasons, it didn't work.
** Sherry Palmer appeared to be a LadyMacbeth-esque figure who's constantly scheming behind-the-scenes to make sure her husband doesn't lose the Presidency. That pretense gets dropped when she lets Alan Milliken (who was trying to blackmail her husband) suffer a heart attack while railing at him, and then preventing Milliken's wife from administering the medicine he needs.
** For some, Mike Novick never recovered from the season 2 incident where he pushed Presidential assistant Lynne Kresge down a flight of stairs (which crippled her), then ''comforted'' her as she was being wheeled to the ambulance.
*** Well, actually Mike didn't do that himself. He just locked Lynne in a room and assigned a guard to watch her. The guard is the one the pushed her down the stairs while she was trying to escape. On the one hand, Mike did a pretty bad thing by locking her in a room so she wouldn't interfere with the plan to impeach Palmer. On the other hand, he likely had no idea something like that was going to happen to her. But yeah, the "comforting" thing still made it a lot worse...
** The show's writers had attempted to humanize Habib Marwan in Season 4, via deleted scenes that show him interacting with a wife and child who he is very caring towards. These scenes were apparently dropped when they realized that he crossed a clear line when he killed tens of thousands via a nuclear power plant meltdown, then followed it up by blowing Air Force One out of the sky and killing the majority of people aboard (including the President's son).
** According to some, even Jack has crossed this line, via his [[spoiler:execution of an unarmed (and surrendering) Dana Walsh]]. He does get called out on it by other characters, and it seems to be the moment where he's finally crossed the deep end.
*** What really makes it all the more of one for Jack was the fact that in spite of his [[GoodIsNotNice methods]] he still had a bit of a personal moral code that was always above the attitude of RevengeBeforeReason. [[spoiler: Killing Dana]] was essentially the point where he went "Screw it."
** Tony Almeida (depending on who you ask) in Season 7. Three words: [[WhamLine "I'm sorry, Larry."]]
** Additionally, many feel President Allison Taylor crossed it by [[spoiler: willingly listening to Charles Logan, despite knowing all about his past crimes and the type of man he is, and outright threatening Dahlia Hassan with the military invasion of her country.]]
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* ''Series/{{Degrassi}}'': This show is generally more concerned with redemption, though Rick even lampshades his own: "It's too late. I already shot someone."

* ''Series/BreakingBad'': Just when Walter White crossed the line from AntiHero to VillainProtagonist, if he ever did, is a matter of debate. Popular candidates include:
** [[Recap/BreakingBadS2E12Phoenix "Phoenix"]], where he [[spoiler: stood by and watched Jane slowly choke to death during her sleep.]]
** [[Recap/BreakingBadS3E13FullMeasure "Full Measure"]], where he [[spoiler:emotionally blackmails Jesse into murdering a defenseless man in cold blood, to save his own skin.]]
** [[Recap/BreakingBadS4E13FaceOff "Face Off"]], when he [[spoiler: poisoned a child (albeit non-lethally) as part of an elaborate scheme to get Jesse on his side against Gus.]]
** [[Recap/BreakingBadS5E7SayMyName "Say My Name"]], where he [[spoiler: shoots Mike in a fit of rage after blackmailing proves unsuccessful.]]
** [[Recap/BreakingBadS5E8GlidingOverAll "Gliding Over All"]], where he [[spoiler: has nine men brutally murdered just to save himself some money--and on the off-chance that one of them ''might'' have eventually ratted him out.]]
** [[Recap/BreakingBadS5E11Confessions "Confessions"]], just when you thought he couldn't get any lower, he [[spoiler:makes a "confession tape" implicating his brother-in-law, Hank, as the mastermind behind everything.]]
** [[Recap/BreakingBadS5E14Ozymandias "Ozymandias"]] begins with Walter [[spoiler:giving up Jesse to the Nazis, then telling Jesse how he let Jane die, even though he could have saved her]]. Towards the end of the episode, he [[spoiler:kidnaps his infant daughter, believing she didn't know enough to turn against him. [[AllForNothing He]] [[TearJerker was]] [[IWantMyMommy wrong]]]].
*** [[WordOfGod Vince Gilligan]] personally believes that the moment where Walt was officially irredeemable is when he [[spoiler:tells Jesse that he let Jane die]]. While almost all of his other actions can be motivated by protecting his family or pragmatism, this is the only act that he considers to have been an act of pure sadism.

** He may have [[spoiler:given the order to kill Tomas]], in which case he crossed it in [[Recap/BreakingBadS3E12HalfMeasures "Half Measures"]].

** [[EvilUncle Shakuni]] and [[BigBad Duryodhan]] cross it at first when they attempt to [[WouldHurtAChild poison Bhim]], although at this point, only the Pandavas know of it. They cross it again when they plot to [[KinslayingIsASpecialKindOfEvil plot to scorch the Pandavas and their mother to death]].

** Marnie for the most part had her moments where she was sympathetic (especially in comparison to the vampires who had grown increasingly unsympathetic during the show), but that completely disappears in the second-to-last episode of season 4 when [[spoiler: she kills Casey, casts a binding spell that prevents Antonia from leaving her, and tries to murder Sookie when she interferes with her attempts to drag the vampires into the deadly force-field).]] She crosses it again when, [[spoiler: after she dies, she possesses Lafayette and uses his body to murder Jesus in cold-blood for his magic.]] At that point, any remaining sympathy for her character is gone.

** For all of Warlow's attempts to make himself look sympathetic, he pretty much crossed the MEH when [[spoiler: he went out of his ways to massacre all the faeries at Hot Wings so they wouldn't interfere with his plans for Sookie.]] And for those who don't think that was enough, he crosses it again in the season 6 finale when [[spoiler: he takes Sookie hostage, plans to turn her into a faerie-bride against her will, and takes away Sookie's ability to consent to this relationship (which arguably makes him an attempted rapist).]]

* ''Series/{{Yellowjackets}}'': Just when you think [[TheFriendNobodyLikes Misty]] has done something to cross it (molesting Coach Scott in his sleep or poisoning him, destroying the emergency signal transmitter, setting a spy camera on Natalie's hotel room) she finds a new way to cross it again and again. Take your pick: [[spoiler:abducting Jessica Roberts and keeping her captive in her basement, allowing the whole group to be poisoned without their knowledge]]... And that is only Season 1.

* ''Series/{{Arrow}}'': Almost every main villain crosses the line at least once at some point.
** In the first appearance of the series’s first truly evil character, The Count, injects a dealer with an overdose of Vertigo just because he failed to kill the Arrow. He makes it obvious that he enjoys the subsequent suffering his drug causes as he hands the dealer a gun, offering him the choice between his life and the Count’s. The pain is so great that he chooses to kill himself as the Count laughs.
** Helena Bertenelli/The Huntress is given multiple chances to redeem herself, but in her final crossing moment, she yells that Oliver betrayed her and began fighting him. Any remaining doubt is squashed when she paralyzes Makenna Hall, forcing her to retire from the police force.
** Malcolm Merlyn/The Dark Archer spends an entire season building up to a crossing. In his Merlyn persona, [[spoiler:he kidnaps Walter, threatens Thea’s life, and mentions repeatedly that he killed Robert to force Moira to stay in line. The tension boils to the point that Moira turns to the Chinese Triad to assassinate him.]] As the Dark Archer (even if his dual identity is kept separate at first), he beats Oliver to near death in their first encounter, then initiates the Undertaking, a manmade earthquake that hit the Glades and killed 503 people, [[spoiler:including his son Tommy]]. Later, after returning from faking his death, he [[spoiler:forces his daughter Thea to murder Sara Lance while she’s drugged to force Oliver to confront Ra’s al Ghul]] and later allied with [[spoiler:Damien Darhk]].
** Barton Mathis, having killed 8 girls in his prior killing spree with his excruciatingly painful methods and helping drive Quentin to alcoholism, began his killing spree anew with 3 girls, including [[spoiler:Laurel Lance]] as revenge against Quentin for arresting him.
** Slade Wilson/Deathstroke kidnapped [[spoiler:Roy Harper]], using his blood to create more Mirakuru soldiers. He sucked out enough blood that [[spoiler:Roy]] was comatose for two weeks and when he awoke had more Mirakuru in his body than blood, driving him to a feral state that led to him [[spoiler:murdering a cop and attempting to kill his girlfriend Thea]]. Not long after, he [[spoiler: murders Moira Queen in front of her children]]. In the flashbacks, it’s revealed that he [[spoiler:tortured Oliver with electricity and tattooed Shado’s tattoo on his back to force him to remember her]].
** Sebastian Blood helped Slade Wilson through his entire campaign to make Oliver Queen suffer, but he crosses the line when he [[spoiler:kidnaps Thea, leaving her imprisoned with only Slade Wilson]]. In a rare moment for the Arrowverse, Sebastian managed to cross the line and actually redeem himself, [[spoiler:giving Oliver the Mirakuru cure and allowing him to take back the city]], with Oliver later referring to him as a friend.
** Amanda Waller may have the best intentions, but her “ends justify the means” mindset means she’s willing to do horrible things for the good of the United States. Threatening to blow up Starling City, murdering millions of civilians in the process, to prevent Slade Wilson’s soldiers from escaping showcases this perfectly
** Warner Zytle proves to be a worthy successor to the title of The Count, modifying the formula to cause the victim to hallucinate their greatest fear. The formula is so strong it causes the person he injects with it in his first appearance to die on the spot. Not fifteen minutes later, he blows up an entire restaurant just to kill Oliver.
** Despite his actions being defendable at first due to his sense of honor, everything Ra’s al Ghul does after learning of Oliver’s survival from their duel is reprehensible, from [[spoiler:murdering innocents every day until Oliver agrees to become his heir, including his sister Thea, indoctrinating him forcibly into the League of Assassins through a ritual that included forcing Oliver to believe he was killing his friend John Diggle, marrying him to Nyssa against both of their wishes, and finally deciding to destroy Starling City with a virus]]. Despite all of that, Oliver later refers to him as honorable to Talia.
** General Shrieve of the Season 3 flashbacks is revealed to be [[spoiler:behind the poisoning of Hong Kong through the Alpha-Omega virus simply to damage China’s economy and prevent it from calling on United States debt. If he had any hope of redemption, it was lost when it was revealed his actions killed Akio, an 11-year-old boy, and he laughed in Oliver’s face]]. Oliver and Maseo tortured Shrieve to death for his actions, driving Oliver away from home and Maseo to the League of Assassins.
** Damien Darhk doesn’t so much cross over the Line as much as he pole vaults over it and gets gold from the judges he hasn’t murdered yet. In a rare moment, he establishes himself as truly evil before he even appears, as Ra’s tells Oliver that he was behind several of the potentially city-destroying threats Oliver stopped in his second year, including a second earthquake machine created by Malcolm Merlyn. In his first appearance, he drains the life force of one of his soldiers for failing him using dark magic, horrifying Team Arrow as that is mostly their first encounter with true magic. Later on, [[spoiler:he attacks a community service project with a drone, nearly killing a little girl, kidnaps William and threatens him with death to get Oliver to drop out of the mayoral race, and murders Laurel Lance using Oliver’s own arrow out of revenge. This is all before he reveals his end game is to literally destroy the world using nuclear weapons.]] By the time Oliver kills him, he has established himself as one of the most, if not the most, evil villain to appear in the series. His subsequent actions on Legends of Tomorrow do not make him any better.
** Andrew Diggle is given multiple chances to redeem himself. Instead, [[spoiler:he gives Damien Darhk the final piece he needs to recreate the idol controlling his magic, leading to Laurel Lance’s death. He ends up torturing his brother John as well with no regrets. His final mistake was threatening to kill John’s daughter Sara, leading to John killing him.]]
** Prometheus appeared to be nothing more than a serial killer at first, but he later revealed himself to be a monster hellbent on revenge against Oliver. The moment that showed how far he was gone? [[spoiler:Adrian having his identity revealed to his wife, only to murder her immediately as she tried to talk him down]].
** Talia al Ghul has no direct crossing, but helping create Prometheus and joining his crusade against Oliver, a crusade that Oliver ironically notes her father would not have supported marks her as irredeemable.
** Cayden James may have been manipulated by [[spoiler:Ricardo Diaz]] into wanting to destroy Star City, but hacking the city and killing random innocents he did of his own accord. Despite that, upon realizing he’d been manipulated and seeing William, being reminded of his own son in the process, he felt remorse for his actions and couldn’t go through with the city’s destruction. As with Sebastian Blood, Oliver seemed to realize this, granting him his request to visit his son’s grave one more time.
** From the beginning, Ricardo Diaz was an evil force. In addition to being revealed to have [[spoiler:manipulated Cayden James into destroying the city before murdering Cayden to take control of his criminal cabal]], he also had a large number of cops on his payroll and [[spoiler:leaked the photo that originally created the investigation into Oliver and the Green Arrow]]. To establish his ruthlessness, he confronted his childhood bully, Jesse, after 30 years and burned him alive, an act so disturbing even Black Siren, a brutal killer who once blew up a man’s head without remorse, couldn’t look at it directly.

* ''Series/Batwoman2019'':
** Alice makes an elaborate plan to kill her stepmother in front of her stepsister, while framing her father for the crime, all because she's too deep into her obsession with revenge for abandoning her. Also counts as an InUniverse example, since this makes Kate and Jacob to finally give up on her, vowing to take her down.
** In the ''Batwoman'' segment of ''Series/CrisisOnInfiniteEarths2019'', we meet a version of Bruce Wayne who abandoned his [[ThouShaltNotKill moral code]] and started killing his RoguesGallery. At first, Kate persistently tries to convince him to [[MyGreatestSecondChance redeem himself]] for the good of the multiverse... and then an angry, suited-up Kara storms into the Batcave with [[spoiler:broken glasses]] and a bombshell that causes a horrified Kate to give up. [[spoiler:Turns out, the reason this Bruce is forced to walk with an exoskeleton is because he's ''also'' a racist lunatic who was too afraid of Superman's power to recognize Superman for the good person he was, prompting him to murder the Man of Steel out of paranoia, justifying this by claiming he gave governments too much power.]]

* ''Series/TheFlash2014''
** The Reverse-Flash passed this long ago. First, he traveled back in time to [[spoiler:[[WouldHurtAChild kill a young Barry Allen]], but failed thanks to interference from the Flash. Instead, he settles on [[KickTheDog killing Barry's mother]] then leaves. However, he discovers that he's TrappedInThePast. He knows exactly what happens in history so he kills Wells' wife for no reason, takes the [[SurgicalImpersonation genetic]] [[BodyHorror code]] [[PainfulTransformation of the]] ''[[KillAndReplace real]]'' [[NiceGuy Dr. Wells]], and creates all the events of the series on purpose, with complete disregard for all the lives of others]]. All so he can get revenge on Barry and steal his speed for [[ItsAllAboutMe himself]].
** Lewis Snart put a bomb in his own daughter's head to make his son work for him.
** Zoom's first appearance on Earth Two was to fake a call about the hostage situation and kill 14 out of 15 cops that came to rescue them. The last one was spared to tell the tale... and after he did, Zoom murdered him too.
** In "Running to Stand Still," the Trickster and Weather Wizard pass out hundreds of bombs ''to children'' all across the city by disguising the Trickster as [[BadSanta Santa Claus]]. When the Flash discovers this, the two gleefully laugh about how they will blow up multiple families if the Flash doesn't let them beat him to death slowly.
** Deathstorm's casual admittance that he hasn't let Martin Stein [[AndIMustScream out in years]].
** Zoom's father murdering his wife while making his young son watch.
** Pictured above, Zoom [[spoiler:[[ImpaledWithExtremePrejudice impaling Barry's father]] [[ForcedToWatch right in front of Barry]], just so he can prove to him that the two of them are the same]].
** Although Savitar has doubtless committed multiple atrocities during his travels throughout time, he finally draws the complete ire of Team Flash by [[spoiler:killing Iris in the future, driving Barry into an eight-year-long HeroicBSOD and splitting both the team and the West family apart in the process.]] It gets even worse with the reveal that Savitar [[spoiler: is none other than [[FallenHero Barry Allen]] himself via the Flash [[StableTimeLoop creating a time remnant in the future to stop Savitar]]. After his complete ostracization from Team Flash and a who-knows-how-long MindRape in the Speed Force, Savitar/Future Flash hates his former self and friends so much that he is willing to kill the love of his life and break his family apart out of pure spite. It really says something that his ''entire existence'' is a direct result of crossing the MoralEventHorizon.]]

* ''Series/AgentsOfSHIELD'' has a few:
** An InUniverse example in "[[Recap/AgentsOfSHIELDS1E5GirlInTheFlowerDress Girl in the Flower Dress]]": Skye decides Miles crossed the MEH by selling Chan Ho Yin out to Centipede for a million dollars. This on top of hacking S.H.I.E.L.D. against her orders. Chan Ho Yin may be a tool, but this revelation made Miles come across as a bigger tool and perhaps irreparably lowered Skye's opinion of Miles.
** Edison Po when he [[spoiler:insists on torturing Coulson's memories of his death out of him]]. Even Raina wasn't pleased that he would resort to potentially deadly torture.
** [[CorruptCorporateExecutive Ian Quinn]], either when he manipulates Seth and Donnie (resulting directly in Seth dying and Donnie becoming the anti-heroic Blizzard) or when he [[spoiler:shoots Skye and then later gloats about it to Coulson (and even before ''that'', we can see he has an extremely callous attitude toward Mike Peterson, viewing him as little more than a weapon).]]
** Lorelei forces a husband to murder his own wife simply because she can and then later rapes Ward whilst he's under her control. However, she makes it clear she crossed it many centuries ago when she gloats to Sif about making her lover a "pet" and using him as a SexSlave. She even forced to Sif to kill him in the end. It's made clear she's done all this and more countless times over her very long life.
** [[spoiler:Garrett]] is clearly over the MEH by the time [[spoiler:he's]] revealed to be the Clairvoyant. Even [[spoiler:his]] most visible crossing point, [[spoiler:provoking Ward into shooting an actor he set up to pose as the Clairvoyant]], happens before [[spoiler:he's implied to have been the Clairvoyant all along]]. However, it is unknown when he definitively crossed the MEH, but [[spoiler:it would appear he crossed it at least fifteen years before the series began, when he targeted Ward and made him think that he was going to protect him (Ward had burned down the house with his abusive brother inside and his parents wanted him tried as an adult), before dumping him in the woods for six months with very little except the clothes on his back and a dog called Buddy. He later ordered Ward to kill the dog because caring about anything is a weakness]]. And if even all that wasn't bad enough for you, his ultimate crossing point comes when [[spoiler:he orders Ward to kill Fitz and Simmons]].
** It is unknown when Daniel Whitehall crosses it, but there are a few indicators that he's perhaps the vilest villain the MCU has ever seen:
*** His InUniverse crossing point is human experimentation with the Obelisk. When he's in her custody, Agent Carter makes it clear that that's a huge part of the reason why she's having him locked up for life, unlike other HYDRA scientists.
*** After his release, [[spoiler:he vivisects a youthful-looking woman just to steal her youth from her and de-age himself. That woman, by the way, happens to be Skye's mother]].
*** Even before [[spoiler:the vivisection]] was revealed, he crossed it by [[spoiler:brainwashing Kara Palamas, an act that led directly to her being stuck with May's face for much of the series, her loss of identity, and, ultimately, her death by friendly fire]].
** Agent Calderon, the TokenEvilTeammate for "Real S.H.I.E.L.D.", crosses it in "[[Recap/AgentsOfSHIELDS2E15OneDoorCloses One Door Closes]]" by going over Bobbi's head and trying to kill Skye rather than take her alive as Bobbi had insisted.
** Towards the end of the second season, we start to see just how nasty Jiaying has become since Whitehall vivisected her. [[spoiler:If killing Gonzales and attacking her own city with a stolen S.H.I.E.L.D. Quinjet to manipulate her people into starting a war wasn't enough, murdering Raina and executing helpless prisoners in cold blood, plus planning to effectively doing this to anybody who stands in her way (even if it's her own daughter), confirms without a doubt how far beyond redemption she is.]]
** Any hope that Ward could be redeemed at some point in the series was crushed in "S.O.S." when [[spoiler:not only does he brutally torture Bobbi Morse and plans on killing her, but then he changes that plan to instead setting a trap so that the person who comes to rescue her (most likely Hunter) will get shot to death instead, and Bobbi will have to helplessly watch it happen.]]
*** If that didn't do it, Ward either [[spoiler:shooting and killing Rosalind Price to bait Coulson]] or personally [[spoiler:torturing Simmons out of anger and desperation]] might have.
** Even Simmons crosses it, believe it or not, when she [[spoiler:attempts to frag Ward with a cheap shot and in doing so ends up disintegrating Bakshi; she even admits that she'd try to kill Ward again given the opportunity]]. Not only does Ward criticize it as something the Simmons he knew never would've even ''thought'' of doing, it marks a major change in her character foreshadowed by several dark moments involving her (up to and including death threats and even advocating genocide) earlier in the second season as she abandons the "totally nonviolent" characterization that had defined her up to that point.
** Gideon Malick subjecting his own HYDRA men to the Terrigen fish oil pills without them knowing so either those who were Inhuman would have powers or those who didn't would die, at least in-series. But as awful as ''that'' is, nearly having the nuclear missile destroy New York in ''The Avengers'' while on the World Council puts his crossing long before he was even on the show.

* ''Series/StarTrekDeepSpaceNine'':
** The last episode has the Female Changeling deal with Cardassian saboteurs by nuking Lakarian City; the resulting death toll is two million. When the Cardassian fleet learns of this, they perform a HeelFaceTurn and begin firing on the Dominion and Breen ships. How does the Female Changeling react to this?
--->'''Female Changeling''': I want the Cardassians exterminated.\\
'''Weyoun''': Which ones?\\
'''Female Changeling''': All of them. The entire population.\\
'''Weyoun''': That may... take some time.\\
'''Female Changeling''': Then I suggest you begin at once.
** The Dominion is revealed to have crossed this line long ago in the Season 4 episode "[[{{Recap/StarTrekDeepSpaceNineS04E24TheQuickening}} The Quickening]]", when they infected an entire planet's population with a slow acting but ultimately lethal bioweapon, purely to discourage other worlds from resisting. This was ''after'' devastating the planet with conventional weapons.
** Gul Dukat was a mad, genocidal, sexually-ravenous dictator to begin with... and then he allied with the Dominion just to get back into a position of power, effectively setting off the chain of events that got his own planet razed to the ground.
** Admiral Leyton spends most of "[[{{Recap/StarTrekDeepSpaceNineS04E11Homefront}} Homefront]] / [[{{Recap/StarTrekDeepSpaceNineS04E12ParadiseLost}} Paradise Lost]]" as a WellIntentionedExtremist who truly believes he's doing a good thing with his conspiracy to take over Earth and put it under martial law. He even looks sorry when he frames his old protege, Ben Sisko, and has him put in a holding cell. [[spoiler:Until three-quarters through the story, the station captures another conspirator and is bringing him to Earth on the ''Defiant'' to testify. Leyton tells his right-hand-woman that the ship was taken over by Changelings and needs to be destroyed]].
** Quark comes close when he agrees to help his cousin sell weapons after his investments fall through and his debt piles up. Everyone calls him out on it and he begins to fear it himself. He stops just short, betraying his partners after they try to sell weapons to a regent who plans on killing millions
* ''Series/StarTrekTheOriginalSeries'':
** Kodos the Executioner from "[[Series/StarTrekTheOriginalSeries The Conscience of the King]]" had murdered half the population of a colony world, picking the survivor half with [[SocialDarwinist Social Darwinism]] having convinced himself it was the only way to alleviate a famine
* ''Series/StarTrekVoyager'': The aliens in "[[{{Recap/StarTrekVoyagerS4E7ScientificMethod}} Scientific Method]]" come across as an entire civilization who crossed the MoralEventHorizon long ago and have just kept on going. They routinely do medical experiments on sentient creatures, mutilating, torturing them, and even killing them if they feel it will benefit their medical research to do so. They feel completely justified in their actions and not only do they feel no remorse or regret over their actions, they feel that what they do is noble and beneficial. Genetically deforming, maiming and killing the crew of Voyager is the NightmareFuel evidence of their crimes and ''that'' is only the tip of the iceberg. What is really terrifying is that their flimsy justifications allow them to murder entire societies with impunity and go on torturing and killing as many sentient creatures as they feel is necessary for their "research."
* Played with and ultimately subverted by ''Series/StepByStep'': [[https://www.hulu.com/watch/ccf24d69-175d-4a5b-a760-65b1fe0d3fee The Foster siblings see J.T. as this during the events of the season 4 finale]] but all later episodes continue to present him as a generally good-natured (if unpopular) person and brother, despite the actions in question clearly proving otherwise.

* ''Series/StarTrekVoyager'':
** The aliens in "[[{{Recap/StarTrekVoyagerS4E7ScientificMethod}} Scientific Method]]" come across as an entire civilization who crossed the MoralEventHorizon long ago and have just kept on going. They routinely do medical experiments on sentient creatures, mutilating, torturing them, and even killing them if they feel it will benefit their medical research to do so. They feel completely justified in their actions and not only do they feel no remorse or regret over their actions, they feel that what they do is noble and beneficial. Genetically deforming, maiming and killing the crew of Voyager is the NightmareFuel evidence of their crimes and ''that'' is only the tip of the iceberg. What is really terrifying is that their flimsy justifications allow them to murder entire societies with impunity and go on torturing and killing as many sentient creatures as they feel is necessary for their "research."
** Captain Ransom in "[[Recap/StarTrekVoyagerS5E25S6E1Equinox Equinox]]" crossed this line when he started murdering aliens as a fuel source for his ship. IDidWhatIHadToDo is nowhere near a sufficient excuse, but he at least seems to realize this at some level and eventually undergoes a HeelFaceTurn and HeroicSacrifice.

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* ''Series/{{Zoey 101}}'': The Gym coaches had been major {{Jerkass}}es[[note]]Coach Phelps only appeared in one episode, "Disc Golf" in Season 1, where he forced the group to run tons and tons of laps, even saying that he would make them run loads more laps if they didn't officially make the disc golf team, but that wasn't quite worthy of crossing.[[/note]], but Coach Keller crosses it in "Wrestling" when he forces Zoey onto the wrestling team by basically ''yelling her into it against her will'' for, unbeknownst to her until the time comes, the sole purpose of using her to make boys forfeit against her in the state tournament to then get another student into the finals without tiring him out and claiming she was "injured". Needless to say, he got what he deserved when Zoey got his substitute out and was walloped big time by Chuck Javers.

*** Brighton crosses it by manipulating [[TheChick Ran]] into offering herself up to be killed, under the false premise that she's a Bosquito and her death will avert the conflict.

** Neil himself crosses it in the season 1 finale when he is willing to strangle Allison after learning of her plan to kill Kevin.

*** Kevin manages to top himself in Season 2. First, it turns out Kevin both started the city-wide blackout ''and'' purposefully destroyed his father's girlfriend Lorraine's hearing aid purely out of spite and amusement; his father Pete, who usually enables him and laughs off his antics, is horrified by his son's actions and tries to get his son to apologize for them, which Kevin refuses, not even caring when he ends up shutting Pete's hand in a car door and not apologizing for it either. Later, when Kevin is dethroned as the "Worcester Wild Dude" by a horse, he has the reporter who wrote the article fired, and later kills the horse and leaves the horse's head on the reporter's car windshield. Finally, Kevin reveals to Sam, a friend of his wife to whom he's trying to give marriage advice, that he is completely aware that he's a horrible person and that his actions are hurting people. Kevin uses the fact that his behavior is goofy and over-the-top so no one can take his actions seriously and punish him, showing that he is an awful man because he chooses to be, not because he's so immature and selfish that he's in the dark about the harm he causes.
** Neil himself crosses it in the finale when he is willing to strangle Allison after learning of her plan to kill Kevin.

** Kevin has multiple potential actions even before the series began including {{Gaslighting}} Allison into thinking she’s a [[DrivesLikeCrazy bad driver]] so he can have sole control of the car, draining their savings account without telling her and getting her fired from her paralegal job which could have given her some true independence from him. Onscreen, he truly crosses it when he cuts Patty off from the friend group (which includes her own brother) and further isolates her by breaking her up with her boyfriend ''[[DisproportionateRetribution just because she didn't get him a burger]]'' when she went to a fast food restaurant. Even worse when you consider that ''she didn't even get herself a burger'' — the wrapper was left in the car by Trevor, the kid in Vermont who was meant to be showing her how to find the drug dealer. But then, Kevin doesn't know that part of the story.
*** Kevin manages to top himself in Season 2. First, its turns out Kevin both started the city-wide blackout ''and'' purposefully destroyed his father's girlfriend Lorraine's hearing aid purely out of spite and amusement; his father Pete, who usually enables him and laughs off his antics, is horrified by his son's actions and tries to get his son to apologize for them, which Kevin refuses, not even caring when he ends up shutting Pete's hand in a car door and not apologizing for it either. Later, when Kevin is dethroned as the "Worcester Wild Dude" by a horse, he has the reporter who wrote the article fired, and later kills the horse and leaves the horse's head on the reporter's car windshield. Finally, Kevin reveals to Sam, a friend of his wife to whom he's trying to give marriage advice, that he is completely aware that he's a horrible person and that his actions are hurting people. Kevin uses the fact that his behavior is goofy and over-the-top so no one can take his actions seriously and punish him, showing that he is an awful man because he chooses to be, not because he's so immature and selfish that he's in the dark about the harm he causes.

* ''Series/TheWalkingDead'': Ed Peletier was certain nobody's favorite character, constantly abusing Carol and Sophia just to show his dominance. Nobody was sad when he was the first of the group to be killed off when the camp was invaded by Walkers and he was off sulking in his tent because Shane had beaten the shit of out him earlier in the day. However, his MoralEventHorizon moment doesn't get revealed until the season two premier when Carol states that he was looking at his own daughter, suggesting he was ready to sexually abuse her as well.
** [[spoiler: Shane]] crosses a MEH when he shoots [[spoiler: Otis]] in the leg, leaving him to be eaten alive by walkers. If not that, then he's definitely crossed it when he [[spoiler:snaps Randall's neck in cold blood and attempts to frame the boy for attacking him, to justify it.]]
** [[spoiler: [[CreepyChild Lizzie]]]] crosses the MEH when [[spoiler: she murders her sister in order to prove humanity within Walkers still exists]], and then planned to do the same thing to Judith.

* ''MoralEventHorizon/OnceUponATime''

--->'''Lex''': [[spoiler: Regarding our most recent subject...keep a close eye on her.]]

-->'''Female Changeling''' - ''"I want the Cardassians exterminated."''
-->'''Weyoun''' - ''"Which ones?"''
-->'''Female Changeling''' - ''"All of them. The entire population."''
-->'''Weyoun''' - ''"That may... take some time."''
-->'''Female Changeling''' - ''"Then I suggest you begin at once."''

** Pictured above, Zoom [[spoiler:[[ImpaledWithExtremePrejudice impaling Barry's father]] [[ForcedToWatch right in front of Barry]], just so he can prove to him that the two of them are NotSoDifferent]].

* Played with and ultimately subverted by ''Series/StepByStep'': [[https://www.hulu.com/watch/ccf24d69-175d-4a5b-a760-65b1fe0d3fee The Foster siblings see him as this during the events of the season 4 finale]] but all later episodes continue to present him as a generally good-natured (if unpopular) person and brother, despite the actions in question clearly proving otherwise.