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** Even though he's already a Decepticon, Starscream shows how much of a piece of slag he is when he [[spoiler: murders his Seekers (the same Seekers who willingly betray Megatron following his presumed death and demotion) in cold blood after merging with the Allspark.]] It gets even worse when [[spoiler: he's rebuilt as a Quintesson Judge, and personally tries to destroy not just Cybertron and all who live on it, but the ''entire universe'', simply out of spite for his mistreatment.]]
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** Even though he's already a Decepticon, Starscream shows how much of a piece of slag he is when he [[spoiler: murders his Seekers (the same Seekers who willingly betray Megatron following his presumed death and demotion) in cold blood after merging with the Allspark.]] It gets even worse when [[spoiler: he's rebuilt as a Quintesson Judge, and personally tries to destroy not just Cybertron and all who live on it, but the ''entire universe'', simply out of spite for his well-deserved mistreatment.]]
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MEH requires the character be irredeemable. Megatron in the WFC trilogy however redeems himself by rejecting Galvatron and working with the Autobots, Decepticons, Maximals, and Predacons in fighting Galvatron and Nemesis, then ending the war between the Autobots and Decepticons, even if more for the idea of their being no point in fighting when there's more than enough room for everyone.
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* ''WesternAnimation/TransformersWarForCybertronTrilogy'':
** Megatron shows us that he's [[JumpingOffTheSlipperySlope moved on from his initial sympathetic motives into pure ruthlessness]] when he [[spoiler:kills Ultra Magnus, his former friend]] after seeming to [[EvenEvilHasStandards have standards]] that prevented him from doing so.
** [[spoiler: Galvatron]] crossed it when it's revealed he's [[spoiler: willing to let Cybertron die by using the Allspark to kill Unicron rather than restore the planet]].
** Megatron shows us that he's [[JumpingOffTheSlipperySlope moved on from his initial sympathetic motives into pure ruthlessness]] when he [[spoiler:kills Ultra Magnus, his former friend]] after seeming to [[EvenEvilHasStandards have standards]] that prevented him from doing so.
** [[spoiler: Galvatron]] crossed it when it's revealed he's [[spoiler: willing to let Cybertron die by using the Allspark to kill Unicron rather than restore the planet]].
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* ''WesternAnimation/TransformersWarForCybertronTrilogy'':
** Megatron shows us that he's [[JumpingOffTheSlipperySlope moved on from his initial sympathetic motives into pure ruthlessness]] when he [[spoiler:kills Ultra Magnus, his former friend]] after seeming to [[EvenEvilHasStandards have standards]] that prevented him from doing so.
** [[spoiler: Galvatron]]''WesternAnimation/TransformersWarForCybertronTrilogy'': [[spoiler:Galvatron]] crossed it when it's revealed he's [[spoiler: willing to let Cybertron die by using the Allspark to kill Unicron rather than restore the planet]].
** Megatron shows us that he's [[JumpingOffTheSlipperySlope moved on from his initial sympathetic motives into pure ruthlessness]] when he [[spoiler:kills Ultra Magnus, his former friend]] after seeming to [[EvenEvilHasStandards have standards]] that prevented him from doing so.
** [[spoiler: Galvatron]]
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** The Nightbird crosses it when she kills the museum security guard ForTheEvulz.
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** The Nightbird crosses it when she kills the museum security guard ForTheEvulz.
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* ''VideoGame/TransformersWarForCybertron'': Megatron warns the Autobots to leave Cybertron or be destroyed. When the Autobots began leaving Cybertron in spaceships, [[spoiler:he has Trypticon blast them out of the atmosphere for no reason whatsoever.]]
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* ''VideoGame/TransformersWarForCybertron'': Megatron After gaining control of Cybertron via Dark Energon, his victory seeming secure, he warns the Autobots to leave Cybertron or be destroyed. When [[spoiler: After Optimus shuts down the Autobots began leaving Cybertron in spaceships, [[spoiler:he core, purging the planet of Dark Energon and cuts off Megatron's control over it, he has Trypticon blast them destroy the transport ships evacuating the Autobots from the planet, murdering thousands of Autobots trying to escape purely out of the atmosphere for no reason whatsoever.spite that anyone dared to defy him.]]
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** In "Five Servos of Doom", Lockdown was revealed to have crossed it a long time ago when he betrayed and murdered Yoketron, [[APupilOfMineUntilHeTurnedToEvil his own mentor]], to steal the protoforms under his guard to sell to Megatron, something he gleefully brags about to Prowl when confronted about it.
--->''"If my first act as a bounty hunter was betraying my sacred sensei, everything since has been easy."''
--->''"If my first act as a bounty hunter was betraying my sacred sensei, everything since has been easy."''
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* ''Film/TransformersRiseOfTheBeasts'' examples:
** The Nightbird crosses it when she kills the museum security guard ForTheEvulz.
** Though Scourge is established as a HeroKiller in the opening scene, he truly crosses the line [[spoiler: when he mortally wounds Bumblebee and infects Airazor with a HatePlague.]]
** The Nightbird crosses it when she kills the museum security guard ForTheEvulz.
** Though Scourge is established as a HeroKiller in the opening scene, he truly crosses the line [[spoiler: when he mortally wounds Bumblebee and infects Airazor with a HatePlague.]]
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Changed line(s) 37 (click to see context) from:
* ''ComicBook/TheTransformersLastStandOfTheWreckers'': One can pick and choose when [[BigBad Overlord]] crossed it. There are three big standouts: his earliest actions which were murdering the Decepticon commanding officer, storming the prison, and tossing the Warden to the inmates. When he casually murders Rotorstorm by blowing his cranium open, or at the very end, when in the climactic fight, he tells Springer that all the guards and Autobots they were trying to save he ordered killed as soon as they landed.
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* ''ComicBook/TheTransformersLastStandOfTheWreckers'': One can pick and choose when [[BigBad Overlord]] crossed it. There are three big standouts: his earliest actions which were murdering the Decepticon commanding officer, Skyquake, storming the prison, and tossing the Warden to the inmates. When he casually murders Rotorstorm by blowing his cranium open, or at the very end, when in the climactic fight, he tells Springer that all the guards and Autobots they were trying to save he ordered killed as soon as they landed.
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MEH requires the character be incapable of redeeming themselves, but also had a chance at redemption in the first place. Megatron had a Heel Face Turn at the end of "Predacons Rising", thanks to no longer wanting to oppress others after Unicron oppressed him, leading him to announce the Decepticon movement dead. Starscream, Shockwave, Airachnaid, and Silas however didn't have a chance at redemption at all.
Deleted line(s) 11,14 (click to see context) :
* In ''WesternAnimation/TransformersPrime'', Megatron, is revealed to have crossed this line back on Cybertron. Aside from ''instigating the very war itself'', he developed a cybonic plague and a bioweapon out of toxic Energon, both of which wiped out most of the Autobots (and lord knows how many innocent Cybertronians) gradually turning the '''entire planet''' into the graveyard it is today. However, he arguably crosses the definitive line in "One Shall Fall", when [[spoiler:he shoots Bumblebee with Dark Energon, nearly killing Raf in the process.]] While Megatron was unaware of [[spoiler:Raf's presence at the time]], his reaction later on establishes he has no problem inflicting off-world casualties. For Optimus, this was the last straw, as he saw no alternative than to ''destroy'' Megatron once this happened.
** Airachnid crossed it millennia ago when she tortured Arcee and murdered Tailgate. Beyond that, we learn she's spent who-knows-how-many years hunting species and committing genocide. For fun. Whether this started before or after Tailgate's murder is unclear.
** Silas crosses it when he works with Airachnid to kidnap June Darby and then shows he's willing to let Airachnid kill her and Jack, dismissing them as collateral damage. His most evil act is killing his own soldiers after they successfully merged him with Breakdowns body.
** [[spoiler: In "Evolution", upon discovering Predaking's transformation, Megatron and his command staff plan the eradication of the newborn Predacon clones, before said clones are given the chance to turn on the Decepticons. Starscream suggests they set it up so the Autobots would look entirely responsible and turn Predaking's anger towards them instead of his creators. Even Shockwave, the creator of the clones, is coldly in favor of the idea, though that's in-character for him: he will always take the most logical decision available, be damned to the moral questions.]]
** Airachnid crossed it millennia ago when she tortured Arcee and murdered Tailgate. Beyond that, we learn she's spent who-knows-how-many years hunting species and committing genocide. For fun. Whether this started before or after Tailgate's murder is unclear.
** Silas crosses it when he works with Airachnid to kidnap June Darby and then shows he's willing to let Airachnid kill her and Jack, dismissing them as collateral damage. His most evil act is killing his own soldiers after they successfully merged him with Breakdowns body.
** [[spoiler: In "Evolution", upon discovering Predaking's transformation, Megatron and his command staff plan the eradication of the newborn Predacon clones, before said clones are given the chance to turn on the Decepticons. Starscream suggests they set it up so the Autobots would look entirely responsible and turn Predaking's anger towards them instead of his creators. Even Shockwave, the creator of the clones, is coldly in favor of the idea, though that's in-character for him: he will always take the most logical decision available, be damned to the moral questions.]]
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You can only cross the Moral Event Horizon once, by definition. It means going from redeemable to irredeemable. There's no such thing as crossing it multiple times.
Changed line(s) 11 (click to see context) from:
* In ''WesternAnimation/TransformersPrime'', Megatron, is revealed to have crossed the line multiple times back on Cybertron. Aside from ''instigating the very war itself'', he developed a cybonic plague and a bioweapon out of toxic Energon, both of which wiped out most of the Autobots (and lord knows how many innocent Cybertronians) gradually turning the '''entire planet''' into the graveyard it is today. However, he arguably crosses the definitive line in "One Shall Fall", when [[spoiler:he shoots Bumblebee with Dark Energon, nearly killing Raf in the process.]] While Megatron was unaware of [[spoiler:Raf's presence at the time]], his reaction later on establishes he has no problem inflicting off-world casualties. For Optimus, this was the last straw, as he saw no alternative than to ''destroy'' Megatron once this happened.
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* In ''WesternAnimation/TransformersPrime'', Megatron, is revealed to have crossed the this line multiple times back on Cybertron. Aside from ''instigating the very war itself'', he developed a cybonic plague and a bioweapon out of toxic Energon, both of which wiped out most of the Autobots (and lord knows how many innocent Cybertronians) gradually turning the '''entire planet''' into the graveyard it is today. However, he arguably crosses the definitive line in "One Shall Fall", when [[spoiler:he shoots Bumblebee with Dark Energon, nearly killing Raf in the process.]] While Megatron was unaware of [[spoiler:Raf's presence at the time]], his reaction later on establishes he has no problem inflicting off-world casualties. For Optimus, this was the last straw, as he saw no alternative than to ''destroy'' Megatron once this happened.
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* ''Anime/TransformersRobotsInDisguise'': Galvatron cemented himself as not just some generic evil conqueror but as one of the most heinous iterations of the character to date the moment he sent his batswarms to brainwash hundreds of human children all across the world and placing them in immense pain and while enjoying watching them suffer. Doesn't help that he intends to repeat the process. What a scumbag, really.
to:
* ''Anime/TransformersRobotsInDisguise'': Galvatron cemented himself as not just some generic evil conqueror but as one of the most heinous iterations of the character to date the moment he sent his batswarms to brainwash hundreds of human children all across the world and placing them in immense pain and while enjoying watching them suffer. Doesn't help that he intends to repeat the process.process on countless other planets. What a scumbag, really.
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Can only be crossed once.
Changed line(s) 6,10 (click to see context) from:
*** If he didn't cross it then, he most certainly did it when he started killing his own soldiers when they said he was going crazy.
** Hydra and Buster have a number of points where they crossed the line.
*** The first one, and arguably the most debatable one is when they attack Ginrai's friends. Granted, they did not target them intentionally, and they were killed in a case of mistaken identity, but the fact they didn't bat an eye over that is really cold.
*** The second one is where they kidnap Lightfoot's father and use him as a hostage, giving Lightfoot the choice of either joining the Decepticons, getting his arms cut off, or having his father murdered.
*** The third one, and the one that is almost certainly a no brainer, is when they personally ask Devil Z to remove them from their humanity, seeing it as a weakness.
** Hydra and Buster have a number of points where they crossed the line.
*** The first one, and arguably the most debatable one is when they attack Ginrai's friends. Granted, they did not target them intentionally, and they were killed in a case of mistaken identity, but the fact they didn't bat an eye over that is really cold.
*** The second one is where they kidnap Lightfoot's father and use him as a hostage, giving Lightfoot the choice of either joining the Decepticons, getting his arms cut off, or having his father murdered.
*** The third one, and the one that is almost certainly a no brainer, is when they personally ask Devil Z to remove them from their humanity, seeing it as a weakness.
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*** The first one, and arguably the most debatable one is when they attack Ginrai's friends. Granted, they did not target them intentionally, and they were killed in a case of mistaken identity, but the fact they didn't bat an eye over that is really cold.
*** The second one is
*** The third one, and the one that is almost certainly a no brainer, is when they personally ask Devil Z to remove them from their humanity, seeing it as a weakness.
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Changed line(s) 35 (click to see context) from:
** In at least the novel, [[spoiler:Megatron [[HeelFaceTurn redeems himself]] in the end when [[TheDogBitesBack he helps Optimus do Sentinel in]] and then announces his intention to sue for peace. Unlike in the film, [[SparedByTheAdaptation he actually lives to see the end of the novel]] as a direct result.]]
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*** The third one, and the one that is almost certainly a no brainer is when they personally ask Devil Z to remove them from their humanity, seeing it as a weakness.
* ''Anime/TransformersRobotsInDisguise'': Galvatron cemented himself as not just some generic evil conqueror but as one of the most heinous iterations of the character to date the moment he sent his batswarms to brainwash 100s of human children all across the world and placing them in immense pain and enjoys watching them suffer. Doesn't help that he intends to repeat the process. What a scumbag really.
* ''Anime/TransformersRobotsInDisguise'': Galvatron cemented himself as not just some generic evil conqueror but as one of the most heinous iterations of the character to date the moment he sent his batswarms to brainwash 100s of human children all across the world and placing them in immense pain and enjoys watching them suffer. Doesn't help that he intends to repeat the process. What a scumbag really.
to:
*** The third one, and the one that is almost certainly a no brainer brainer, is when they personally ask Devil Z to remove them from their humanity, seeing it as a weakness.
* ''Anime/TransformersRobotsInDisguise'': Galvatron cemented himself as not just some generic evil conqueror but as one of the most heinous iterations of the character to date the moment he sent his batswarms to brainwash100s hundreds of human children all across the world and placing them in immense pain and enjoys while enjoying watching them suffer. Doesn't help that he intends to repeat the process. What a scumbag scumbag, really.
* ''Anime/TransformersRobotsInDisguise'': Galvatron cemented himself as not just some generic evil conqueror but as one of the most heinous iterations of the character to date the moment he sent his batswarms to brainwash
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** If he didn't cross it then, he most certainly did it when he started killing his own soldiers when they said he was going crazy.
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Changed line(s) 8,10 (click to see context) from:
** The first one, and arguably the most debatable one is when they attack Ginrai's friends. Granted, they did not target them intentionally, and they were killed in a case of mistaken identity, but the fact they didn't bat an eye over that is really cold.
** The second one is where they kidnap Lightfoot's father and use him as a hostage, giving Lightfoot the choice of either joining the Decepticons, getting his arms cut off, or having his father murdered.
** The third one, and the one that is almost certainly a no brainer is when they personally ask Devil Z to remove them from their humanity, seeing it as a weakness.
** The second one is where they kidnap Lightfoot's father and use him as a hostage, giving Lightfoot the choice of either joining the Decepticons, getting his arms cut off, or having his father murdered.
** The third one, and the one that is almost certainly a no brainer is when they personally ask Devil Z to remove them from their humanity, seeing it as a weakness.
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MoralEventHorizon in the ''Franchise/Transformers'' franchise.
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MoralEventHorizon in the ''Franchise/Transformers'' ''Franchise/{{Transformers}}'' franchise.
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Add from MoralEventHorizon/ComicBooks, MoralEventHorizon/LiveActionFilms, MoralEventHorizon/VideoGames, MoralEventHorizon/WesternAnimation, and respective YMMV pages
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MoralEventHorizon in the ''Franchise/Transformers'' franchise.
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!!Animated series
* ''Anime/TransformersSuperGodMasterforce'':
** Devil Z crossed the line when he ordered the Death Para Machine to destroy the Earth's stratosphere and thus destroy humanity.
** If he didn't cross it then, he most certainly did it when he started killing his own soldiers when they said he was going crazy.
** Hydra and Buster have a number of points where they crossed the line.
** The first one, and arguably the most debatable one is when they attack Ginrai's friends. Granted, they did not target them intentionally, and they were killed in a case of mistaken identity, but the fact they didn't bat an eye over that is really cold.
** The second one is where they kidnap Lightfoot's father and use him as a hostage, giving Lightfoot the choice of either joining the Decepticons, getting his arms cut off, or having his father murdered.
** The third one, and the one that is almost certainly a no brainer is when they personally ask Devil Z to remove them from their humanity, seeing it as a weakness.
* ''Anime/TransformersRobotsInDisguise'': Galvatron cemented himself as not just some generic evil conqueror but as one of the most heinous iterations of the character to date the moment he sent his batswarms to brainwash 100s of human children all across the world and placing them in immense pain and enjoys watching them suffer. Doesn't help that he intends to repeat the process. What a scumbag really.
* ''WesternAnimation/TransformersAnimated'':
** In "Predacons Rising", Blackarachnia jumps off the slippery slope by mutating a mentally unstable Wasp and then casually admitting she doesn't care if he lives or dies so long as she could find a cure for herself. Her oft-teased redemption was pretty much dead by that point.
** Prometheus Black decides to use the child of his "arch-nemesis" as the test subject for making an organic Transformer. This is ''after'' he already tried it on two adults and permanently left them in misshapen bestial forms.
* In ''WesternAnimation/TransformersPrime'', Megatron, is revealed to have crossed the line multiple times back on Cybertron. Aside from ''instigating the very war itself'', he developed a cybonic plague and a bioweapon out of toxic Energon, both of which wiped out most of the Autobots (and lord knows how many innocent Cybertronians) gradually turning the '''entire planet''' into the graveyard it is today. However, he arguably crosses the definitive line in "One Shall Fall", when [[spoiler:he shoots Bumblebee with Dark Energon, nearly killing Raf in the process.]] While Megatron was unaware of [[spoiler:Raf's presence at the time]], his reaction later on establishes he has no problem inflicting off-world casualties. For Optimus, this was the last straw, as he saw no alternative than to ''destroy'' Megatron once this happened.
** Airachnid crossed it millennia ago when she tortured Arcee and murdered Tailgate. Beyond that, we learn she's spent who-knows-how-many years hunting species and committing genocide. For fun. Whether this started before or after Tailgate's murder is unclear.
** Silas crosses it when he works with Airachnid to kidnap June Darby and then shows he's willing to let Airachnid kill her and Jack, dismissing them as collateral damage. His most evil act is killing his own soldiers after they successfully merged him with Breakdowns body.
** [[spoiler: In "Evolution", upon discovering Predaking's transformation, Megatron and his command staff plan the eradication of the newborn Predacon clones, before said clones are given the chance to turn on the Decepticons. Starscream suggests they set it up so the Autobots would look entirely responsible and turn Predaking's anger towards them instead of his creators. Even Shockwave, the creator of the clones, is coldly in favor of the idea, though that's in-character for him: he will always take the most logical decision available, be damned to the moral questions.]]
* ''WesternAnimation/TransformersRescueBots'': [[spoiler: Dr. Morocco crosses his when he basically orders the Morbot to [[WouldHurtAChild kill Cody and Frankie]].]]
* ''WesternAnimation/TransformersRobotsInDisguise2015'':
** ''Guilty As Charged'': [[spoiler: Nightra crossed it when she was about to eject Strongarm's friends out of Blastwave's ship.]]
** ''Collateral Damage'': [[spoiler: Soundwave crossed it hard the moment he declares that he will summon Megatron, even if it means obliterating all life on Earth.]] This strongly angers Steeljaw (who wants to rule Earth, [[EvilVersusOblivion not destroy it]]), as well as the Autobots.
* ''WesternAnimation/TransformersCyberverse'':
** Even though he's already a Decepticon, Starscream shows how much of a piece of slag he is when he [[spoiler: murders his Seekers (the same Seekers who willingly betray Megatron following his presumed death and demotion) in cold blood after merging with the Allspark.]] It gets even worse when [[spoiler: he's rebuilt as a Quintesson Judge, and personally tries to destroy not just Cybertron and all who live on it, but the ''entire universe'', simply out of spite for his mistreatment.]]
** The Scientist crosses it when he kidnaps hundreds of Soundwaves from the universes that were destroyed thanks to him, immobilizing them and forcing them to be nothing more than souvenirs. All while continuing to assist the Quintessons' omnicidal goals even when it no longer brings sadistic pleasure to him. It's no wonder just the sight of this was what led to Soundwave's CharacterDevelopment and HeelFaceTurn.
** Megatron X crosses it either when he [[spoiler: kills Optimus Prime for refusing to join him then proceeding to wipe out all the Autobots and Decepticons]], or when he [[spoiler: brutally kills his other counterpart out of sheer contempt]].
* ''WesternAnimation/TransformersWarForCybertronTrilogy'':
** Megatron shows us that he's [[JumpingOffTheSlipperySlope moved on from his initial sympathetic motives into pure ruthlessness]] when he [[spoiler:kills Ultra Magnus, his former friend]] after seeming to [[EvenEvilHasStandards have standards]] that prevented him from doing so.
** [[spoiler: Galvatron]] crossed it when it's revealed he's [[spoiler: willing to let Cybertron die by using the Allspark to kill Unicron rather than restore the planet]].
!!Films
* ''WesternAnimation/TheTransformersTheMovie'': Megatron famously crossed it when he killed Optimus, though one could he say he crossed it far earlier with the Robo-Smasher (aka. the device he used to horrifically brainwash the peaceful Constructicons into Decepticons and destroy Crystal City). For Blitzwing at least, the deal with the Quintessons was the point of no return for Galvatron.
* ''Film/TransformersRevengeOfTheFallen'': The Fallen ''choosing'' to wipe out a populated star system because he wanted to probably lands him pretty far on the other side of this.
* ''Film/TransformersDarkOfTheMoon'':
** [[spoiler:Sentinel Prime]] brutally killing [[spoiler:Ironhide]]. Also, [[spoiler:the Decepticons' genocidal attack on Chicago]] in the same movie might have finally driven home the point that yes, the Decepticons really ARE evil.
** In at least the novel, [[spoiler:Megatron [[HeelFaceTurn redeems himself]] in the end when [[TheDogBitesBack he helps Optimus do Sentinel in]] and then announces his intention to sue for peace. Unlike in the film, [[SparedByTheAdaptation he actually lives to see the end of the novel]] as a direct result.]]
** Laserbeak: [[spoiler:"Is your daddy home?", said right before ''killing the poor girl's parents right in front of her'']].
** When Soundwave brutally executed [[spoiler:Wheeljack]] after the Autobot had surrendered and was begging for mercy, you knew he deserved everything that happened next.
** Any sympathy for [[spoiler:Dylan]] leaves when one sees the lengths he's willing to go to ensure that [[spoiler:he isn't harmed by the coming AlienInvasion. Like when he reassures himself that he's safe... while watching ''hundreds of innocent civilians be slaughtered by the Decepticons.'']]
** Towards the end, [[spoiler:Gould, after repeatedly claiming his position as TheQuisling is just "business" [[note]]He inherited the 'Cons as "clients" from his dad, doesn't want to die, and they've made him fantastically rich, and have promised him a position as the administrator of the human slaves on Cybertron.[[/note]], tells the Decepticons that they should just kill the Autobots instead of making them prisoners. He specifically says it's personal now, and has no objections when Soundwave muses "No prisoners. Only trophies."]]
* ''Film/TransformersAgeOfExtinction'': Lockdown crosses it in his first scene by coldly murdering [[spoiler:Ratchet]].
** If he didn't cross it already (allowing Tessa to be threatened or refuse to allow paramedics during Galvatron's out of control rampage), Attinger crossed it big time when he allowed Savoy to kill witnesses and gave Lockdown the okay to level Hong Kong to hide his plans.
** Any sympathy Savoy would want people to show him die out when he threatens Tessa to make Cade give Optimus Prime's location.
* ''Film/{{Bumblebee}}'': [[BigBadDuumvirate Shatter and Dropkick]] cross the line early in the film [[ColdBloodedTorture with their vicious murder]] of [[spoiler:Cliffjumper]].
!!Other media
* ''ComicBook/TheTransformersLastStandOfTheWreckers'': One can pick and choose when [[BigBad Overlord]] crossed it. There are three big standouts: his earliest actions which were murdering the Decepticon commanding officer, storming the prison, and tossing the Warden to the inmates. When he casually murders Rotorstorm by blowing his cranium open, or at the very end, when in the climactic fight, he tells Springer that all the guards and Autobots they were trying to save he ordered killed as soon as they landed.
* In the ''Dark of the Moon'' ''Foundation'' prequel comics, Shockwave crosses it at least once an issue. He starts issue 2 off by killing Chromia, finishes off issue 3 by [[spoiler: killing Jolt, Knock Out, Dune Runner, Longarm, Salvage, and Galloway]] and then in issue 4 [[spoiler: he kills Elita-1, then mocks Optimus about it. [[RoaringRampageOfRevenge He didn't think the last part through]].]]
* ''ComicBook/TransformersBeastWars2021'': [[spoiler: The Predacons, sans Dinobot cross it when having Nyx tortured for information about the other Maximals, and attempting to execute her when she's unable to escape. Dinobot is understandably disgusted by this.]]
* ''VideoGame/TransformersWarForCybertron'': Megatron warns the Autobots to leave Cybertron or be destroyed. When the Autobots began leaving Cybertron in spaceships, [[spoiler:he has Trypticon blast them out of the atmosphere for no reason whatsoever.]]
* ''VideoGame/TransformersFallOfCybertron'':
** [[spoiler: When Optimus sees that Megatron is as desperate for energon as the Autobots, he proposes a truce to resolve their mutual problem. Megatron refuses, [[NeverMyFault blames Optimus for everything]], and insists that [[ItsAllAboutMe he alone]] is Cybertron's future, swearing to kill Optimus and the Autobots.]]
** Shockwave's experiments cross this, as he surgically rips apart and rebuilds whoever he experiments on. To make it worse, he keeps them functional and aware while he tears them apart and rebuilds them. While most of the Dinobots seemingly don't remember, [[AndIMustScream Grimlock does]].
* ''VideoGame/TransformersDevastation'': Megatron is quick to cross this with a plan to turn Earth into a new Cybertron, gleeful at the thought of wiping out the planet's indigenous life.
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!!Animated series
* ''Anime/TransformersSuperGodMasterforce'':
** Devil Z crossed the line when he ordered the Death Para Machine to destroy the Earth's stratosphere and thus destroy humanity.
** If he didn't cross it then, he most certainly did it when he started killing his own soldiers when they said he was going crazy.
** Hydra and Buster have a number of points where they crossed the line.
** The first one, and arguably the most debatable one is when they attack Ginrai's friends. Granted, they did not target them intentionally, and they were killed in a case of mistaken identity, but the fact they didn't bat an eye over that is really cold.
** The second one is where they kidnap Lightfoot's father and use him as a hostage, giving Lightfoot the choice of either joining the Decepticons, getting his arms cut off, or having his father murdered.
** The third one, and the one that is almost certainly a no brainer is when they personally ask Devil Z to remove them from their humanity, seeing it as a weakness.
* ''Anime/TransformersRobotsInDisguise'': Galvatron cemented himself as not just some generic evil conqueror but as one of the most heinous iterations of the character to date the moment he sent his batswarms to brainwash 100s of human children all across the world and placing them in immense pain and enjoys watching them suffer. Doesn't help that he intends to repeat the process. What a scumbag really.
* ''WesternAnimation/TransformersAnimated'':
** In "Predacons Rising", Blackarachnia jumps off the slippery slope by mutating a mentally unstable Wasp and then casually admitting she doesn't care if he lives or dies so long as she could find a cure for herself. Her oft-teased redemption was pretty much dead by that point.
** Prometheus Black decides to use the child of his "arch-nemesis" as the test subject for making an organic Transformer. This is ''after'' he already tried it on two adults and permanently left them in misshapen bestial forms.
* In ''WesternAnimation/TransformersPrime'', Megatron, is revealed to have crossed the line multiple times back on Cybertron. Aside from ''instigating the very war itself'', he developed a cybonic plague and a bioweapon out of toxic Energon, both of which wiped out most of the Autobots (and lord knows how many innocent Cybertronians) gradually turning the '''entire planet''' into the graveyard it is today. However, he arguably crosses the definitive line in "One Shall Fall", when [[spoiler:he shoots Bumblebee with Dark Energon, nearly killing Raf in the process.]] While Megatron was unaware of [[spoiler:Raf's presence at the time]], his reaction later on establishes he has no problem inflicting off-world casualties. For Optimus, this was the last straw, as he saw no alternative than to ''destroy'' Megatron once this happened.
** Airachnid crossed it millennia ago when she tortured Arcee and murdered Tailgate. Beyond that, we learn she's spent who-knows-how-many years hunting species and committing genocide. For fun. Whether this started before or after Tailgate's murder is unclear.
** Silas crosses it when he works with Airachnid to kidnap June Darby and then shows he's willing to let Airachnid kill her and Jack, dismissing them as collateral damage. His most evil act is killing his own soldiers after they successfully merged him with Breakdowns body.
** [[spoiler: In "Evolution", upon discovering Predaking's transformation, Megatron and his command staff plan the eradication of the newborn Predacon clones, before said clones are given the chance to turn on the Decepticons. Starscream suggests they set it up so the Autobots would look entirely responsible and turn Predaking's anger towards them instead of his creators. Even Shockwave, the creator of the clones, is coldly in favor of the idea, though that's in-character for him: he will always take the most logical decision available, be damned to the moral questions.]]
* ''WesternAnimation/TransformersRescueBots'': [[spoiler: Dr. Morocco crosses his when he basically orders the Morbot to [[WouldHurtAChild kill Cody and Frankie]].]]
* ''WesternAnimation/TransformersRobotsInDisguise2015'':
** ''Guilty As Charged'': [[spoiler: Nightra crossed it when she was about to eject Strongarm's friends out of Blastwave's ship.]]
** ''Collateral Damage'': [[spoiler: Soundwave crossed it hard the moment he declares that he will summon Megatron, even if it means obliterating all life on Earth.]] This strongly angers Steeljaw (who wants to rule Earth, [[EvilVersusOblivion not destroy it]]), as well as the Autobots.
* ''WesternAnimation/TransformersCyberverse'':
** Even though he's already a Decepticon, Starscream shows how much of a piece of slag he is when he [[spoiler: murders his Seekers (the same Seekers who willingly betray Megatron following his presumed death and demotion) in cold blood after merging with the Allspark.]] It gets even worse when [[spoiler: he's rebuilt as a Quintesson Judge, and personally tries to destroy not just Cybertron and all who live on it, but the ''entire universe'', simply out of spite for his mistreatment.]]
** The Scientist crosses it when he kidnaps hundreds of Soundwaves from the universes that were destroyed thanks to him, immobilizing them and forcing them to be nothing more than souvenirs. All while continuing to assist the Quintessons' omnicidal goals even when it no longer brings sadistic pleasure to him. It's no wonder just the sight of this was what led to Soundwave's CharacterDevelopment and HeelFaceTurn.
** Megatron X crosses it either when he [[spoiler: kills Optimus Prime for refusing to join him then proceeding to wipe out all the Autobots and Decepticons]], or when he [[spoiler: brutally kills his other counterpart out of sheer contempt]].
* ''WesternAnimation/TransformersWarForCybertronTrilogy'':
** Megatron shows us that he's [[JumpingOffTheSlipperySlope moved on from his initial sympathetic motives into pure ruthlessness]] when he [[spoiler:kills Ultra Magnus, his former friend]] after seeming to [[EvenEvilHasStandards have standards]] that prevented him from doing so.
** [[spoiler: Galvatron]] crossed it when it's revealed he's [[spoiler: willing to let Cybertron die by using the Allspark to kill Unicron rather than restore the planet]].
!!Films
* ''WesternAnimation/TheTransformersTheMovie'': Megatron famously crossed it when he killed Optimus, though one could he say he crossed it far earlier with the Robo-Smasher (aka. the device he used to horrifically brainwash the peaceful Constructicons into Decepticons and destroy Crystal City). For Blitzwing at least, the deal with the Quintessons was the point of no return for Galvatron.
* ''Film/TransformersRevengeOfTheFallen'': The Fallen ''choosing'' to wipe out a populated star system because he wanted to probably lands him pretty far on the other side of this.
* ''Film/TransformersDarkOfTheMoon'':
** [[spoiler:Sentinel Prime]] brutally killing [[spoiler:Ironhide]]. Also, [[spoiler:the Decepticons' genocidal attack on Chicago]] in the same movie might have finally driven home the point that yes, the Decepticons really ARE evil.
** In at least the novel, [[spoiler:Megatron [[HeelFaceTurn redeems himself]] in the end when [[TheDogBitesBack he helps Optimus do Sentinel in]] and then announces his intention to sue for peace. Unlike in the film, [[SparedByTheAdaptation he actually lives to see the end of the novel]] as a direct result.]]
** Laserbeak: [[spoiler:"Is your daddy home?", said right before ''killing the poor girl's parents right in front of her'']].
** When Soundwave brutally executed [[spoiler:Wheeljack]] after the Autobot had surrendered and was begging for mercy, you knew he deserved everything that happened next.
** Any sympathy for [[spoiler:Dylan]] leaves when one sees the lengths he's willing to go to ensure that [[spoiler:he isn't harmed by the coming AlienInvasion. Like when he reassures himself that he's safe... while watching ''hundreds of innocent civilians be slaughtered by the Decepticons.'']]
** Towards the end, [[spoiler:Gould, after repeatedly claiming his position as TheQuisling is just "business" [[note]]He inherited the 'Cons as "clients" from his dad, doesn't want to die, and they've made him fantastically rich, and have promised him a position as the administrator of the human slaves on Cybertron.[[/note]], tells the Decepticons that they should just kill the Autobots instead of making them prisoners. He specifically says it's personal now, and has no objections when Soundwave muses "No prisoners. Only trophies."]]
* ''Film/TransformersAgeOfExtinction'': Lockdown crosses it in his first scene by coldly murdering [[spoiler:Ratchet]].
** If he didn't cross it already (allowing Tessa to be threatened or refuse to allow paramedics during Galvatron's out of control rampage), Attinger crossed it big time when he allowed Savoy to kill witnesses and gave Lockdown the okay to level Hong Kong to hide his plans.
** Any sympathy Savoy would want people to show him die out when he threatens Tessa to make Cade give Optimus Prime's location.
* ''Film/{{Bumblebee}}'': [[BigBadDuumvirate Shatter and Dropkick]] cross the line early in the film [[ColdBloodedTorture with their vicious murder]] of [[spoiler:Cliffjumper]].
!!Other media
* ''ComicBook/TheTransformersLastStandOfTheWreckers'': One can pick and choose when [[BigBad Overlord]] crossed it. There are three big standouts: his earliest actions which were murdering the Decepticon commanding officer, storming the prison, and tossing the Warden to the inmates. When he casually murders Rotorstorm by blowing his cranium open, or at the very end, when in the climactic fight, he tells Springer that all the guards and Autobots they were trying to save he ordered killed as soon as they landed.
* In the ''Dark of the Moon'' ''Foundation'' prequel comics, Shockwave crosses it at least once an issue. He starts issue 2 off by killing Chromia, finishes off issue 3 by [[spoiler: killing Jolt, Knock Out, Dune Runner, Longarm, Salvage, and Galloway]] and then in issue 4 [[spoiler: he kills Elita-1, then mocks Optimus about it. [[RoaringRampageOfRevenge He didn't think the last part through]].]]
* ''ComicBook/TransformersBeastWars2021'': [[spoiler: The Predacons, sans Dinobot cross it when having Nyx tortured for information about the other Maximals, and attempting to execute her when she's unable to escape. Dinobot is understandably disgusted by this.]]
* ''VideoGame/TransformersWarForCybertron'': Megatron warns the Autobots to leave Cybertron or be destroyed. When the Autobots began leaving Cybertron in spaceships, [[spoiler:he has Trypticon blast them out of the atmosphere for no reason whatsoever.]]
* ''VideoGame/TransformersFallOfCybertron'':
** [[spoiler: When Optimus sees that Megatron is as desperate for energon as the Autobots, he proposes a truce to resolve their mutual problem. Megatron refuses, [[NeverMyFault blames Optimus for everything]], and insists that [[ItsAllAboutMe he alone]] is Cybertron's future, swearing to kill Optimus and the Autobots.]]
** Shockwave's experiments cross this, as he surgically rips apart and rebuilds whoever he experiments on. To make it worse, he keeps them functional and aware while he tears them apart and rebuilds them. While most of the Dinobots seemingly don't remember, [[AndIMustScream Grimlock does]].
* ''VideoGame/TransformersDevastation'': Megatron is quick to cross this with a plan to turn Earth into a new Cybertron, gleeful at the thought of wiping out the planet's indigenous life.
