History Main / JumpingoffTheSlipperySlope

26th Sep '16 11:57:58 PM jormis29
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** Also narrowly averted in the [[Anime/FullmetalAlchemist 2003 anime version]] when Ed almost uses the prisoners trapped in Lab 5 to create a philosopher's stone he's been searching for.

to:

** Also narrowly averted in the [[Anime/FullmetalAlchemist 2003 anime version]] when Ed almost uses the prisoners trapped in Lab 5 to create a philosopher's stone PhilosophersStone he's been searching for.
26th Sep '16 11:55:17 PM jormis29
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* ''Film/CrimsonTide'' is often noted as quite admirably morally complex for a Jerry Bruckheimer film, with Gene Hackman's character given quite a bit of sympathy in wanting to l

to:

* ''Film/CrimsonTide'' is often noted as quite admirably morally complex for a Jerry Bruckheimer film, with Gene Hackman's character given quite a bit of sympathy in wanting to llaunch the missiles. At least until the ending, when he makes a thinly veiled racist comment to DenzelWashington, which Washington promptly reverses on him.
* ''Film/TheDarkKnight'', [[spoiler:Harvey Dent]] didn't so much "jump off" as much as [[spoiler:get [[strike:kicked]] [[BreakThemByTalking a little push]] from SelfDemonstrating/TheJoker]].
* ''Film/SweeneyToddTheDemonBarberOfFleetStreet'': Sweeney Todd goes from wanting to just get [[RoaringRampageOfRevenge revenge on two specific people]] to [[SerialKiller randomly murdering]] people off the streets who won't be missed and having them ''[[ImAHumanitarian baked into pies]]'' about halfway through the movie (same thing goes for the [[Theatre/SweeneyToddTheDemonBarberOfFleetStreet stage version]] as well).
* [[ColdSniper Major König]] in ''Film/EnemyAtTheGates'' might be a PunchClockVillain or a WorthyOpponent for most of the movie. He even [[EvenEvilHasStandards shows a veiled contempt]] for brutal goons who beat up prisoners. And then he [[spoiler:hangs a little kid]].
* In ''Film/{{Super}}'', Creator/RainnWilson's character decides to fight crime. This begins with trying to stop drug dealers, but turns into him brutally beating people with a pipe wrench (for cutting in line at the movie theatre).
* A German Film ''Stahlnetz: PSI'' begins with two brothers kidnapping a rich girl [[spoiler: actually she is not...]] for ransom. They reason a girl is a SpoiledBrat anyway and a few days in captivity won't hurt - and for her family, a million is only a pocket money, so it's not really bad. But then the younger brother decides that it is better to leave the girl to die, and [[spoiler: when the other brother objects, beats him up and locks him together with the girl to die]].
* In ''Film/{{Jumper}}'', the Paladins are concerned that the Jumpers will use their powers for selfish gain at the expense of others. In fact, they are right. However, they stop them by straight up murdering all Jumpers they come across and anyone associated with them, turning them into the bad guys. It also doesn't help that they use religious rhetoric to justify their actions, coming off as {{Knight Templar}}s.
* In Film/TheStarChamber, the turning point comes, if not before, when Hardin and the rest go vigilante in order to pursue justice as they see it.
* In ''Film/{{Ghostbusters 1984}}'', EPA agent Walter Peck had a point that the Ghostbusters' operations needed some inspection, especially considering Egon was getting worried about the abnormal amount of spectral energy they are containing in their protection grid. However, he had the wrong attitude as he acted all important and showed his control-freak nature. When Peck later vindictively barges into the business with a court order and imperiously orders the grid shutdown despite the warnings of the Busters and the reservations of the accompanying utility worker, he is shown to be totally unreasonable and completely in the wrong. And he goes beyond his inspecting duties showing how petty his motivations are and how the most important thing for him is throwing his weight around. The fact that Peck then orders the Busters arrested for an explosion he himself clearly was responsible for makes him truly despicable.
* ''Film/XMen'':
** Discussed between the president and Beast in ''Film/XMenTheLastStand'', when they debate weaponizing the cure as a safeguard against dangerous mutants. The president tries to rationalize it as a extreme circumstance, to which Beast responds by pointing out how quickly such a justification can snowball before resigning. The president ends up doing just that when Magneto's mutant army shows up, but by the end he's climbed back up and rehired Beast to help smooth things out again.
** For all its faults, ''Film/XMenOriginsWolverine'''s opening montage of the many wars the US has been in did show Victor's decline from a soldier doing his job to a ruthless killer quite nicely without being really obvious about it.
** ''Film/XMenDaysOfFuturePast'':
*** Young Erik has grown increasingly amoral since his actions in ''First Class''. Mystique isn't far off, either. The two split right before Dallas.
*** Trask Industries' Sentinels originally targeted mutants. But as time passed, their programming came to include regular humans whose offspring would be mutants and eventually, anyone sympathetic to mutants who stood in their way. This ultimately brought about the BadFuture where the worst of humanity lord over the remnants of civilization, using the latest Sentinels to finish off the mutants once and for all.
* ''Film/{{Armored}}'': Mike Cochrane, to the max, as observed by Tyler throughout the course of the plan going awry. Mike finding the opportunity to pull a $42 million heist irresistible to the point he had to pull Tyler in to get the necessary numbers for it was the first sign to Ty that things were going too far. Not abandoning ship (or letting Ty do so) once Baines broke their "nobody gets hurt" promise let Ty know that he couldn't trust Mike. From there, Mike would repeatedly hatch every plan in the book to try to get out with the money anyway as well as kill Ty and [[MauveShirt deputy Jake Echkehart]] [[HeKnowsTooMuch to keep him from talking]]. This winds up [[spoiler:forcing Palmer to kill first Dobbs, then himself, because of their consciences, and gets Quinn and Baines killed when Tyler decides to blow up the money in his car and they get caught in the blast. Finally, the fiasco ends... with Mike's soul so far gone that even with all the money burned and all his conspirators dead, he tries to viciously run over and kill his own godson with the armored truck rather than admit this whole thing went a million degrees wrong.]]
* ''WesternAnimation/MyLittlePonyEquestriaGirlsFriendshipGames'': Human Twilight, after transforming into [[spoiler:Midnight Sparkle]] goes from well meaning but somewhat reckless investigator of magic to [[spoiler: raging she demon that tries ripping apart her own world to get to Equestria so she can study magic.]]
* ''Film/{{Juice}}'': [[spoiler: Bishop was originally just a ChaoticNeutral who was tired of constantly being harassed, who eventually loses it as he kills a store owner, his best friend, and nearly kills one of his other closest friends.]]
[[/folder]]

[[folder:Literature]]
* Oh dear lord Jacen in ''Literature/LegacyOfTheForce''. In the first book he has a vision that the galaxy will fall into chaos and he will end up killing his mentor Luke Skywalker unless he listens to the Villain of the books, and is forced to kill one of his allies who refuses to listen to Jacen's reasoning. Cut to book two when he tortures a prisoner because she knows about a plot to kill his parents and accidentally kills her. Cut then to book three where it is ''he'' who is trying to kill his parents because "My parents are terrorist scum, and that is why I have to show no mercy towards them." This might be a clever showcasing exactly how "Falling to the Dark Side" works - turning the most justifiable cause into ForTheEvulz-ObviouslyEvil.
* In Creator/DamonKnight's short story "The Analogues", a scientist invents a procedure to create a "better conscience" in the form of hallucinations that prevent you from committing crimes. This raises a lot of questions about the morality of removing free choice, but then it turns out the scientist plans to use it to take over the world, and has [[spoiler:already used it on the protagonist to prevent him from stopping the plot]].
* In ''Literature/TheDresdenFiles'', the White Council is extremely strict with their 7 Laws of Wizardry. First violation means an instant beheading unless a wizard on the Council bets their life they can reform the wizard, except in rare cases of self-defense. This is because Black Magic is almost always a slippery slope.
** In ''Changes'', [[spoiler:Harry- after surviving a ''brutal'' TraumaCongaLine- decides that he will do anything to save his daughter, and that the ends justify the means.]] He ends up making a DealWithTheDevil, and personally considers himself evil from that point on. [[spoiler:Once his daughter is safe, he commits suicide, not wanting to live if it means being the Winter Knight.]] But that only makes things worse.
* King Erius in [[{{Nightrunner}} Lynn Flewelling's]] ''Tamir'' trilogy starts by taking the throne from his insane mother, who was executing people left and right, in defiance of the divine edict that for no apparent reason essentially promises Bad Things if a man ever rules the country. Bad Things happen. You could debate whether or not he is really to blame for all that, but then he proceeds to institute sexist practices and start killing off his all female relatives.
* Ho boy, does this ''ever'' happen in the eleventh book of ''Literature/{{Everworld}}'' to [[spoiler: Senna Wales]]. K.A. "{{Ambitio|nIsEvil}}us, intelligent, controlling, VisionaryVillain with a taste for power" into "batshit insane, power-mad, {{Genre Blind|ness}} BadBoss EvilOverlord."
* In ''Literature/MemorySorrowAndThorn'', this trope in a nutshell is the {{backstory}} of the BigBad, the [[TheFairFolk Sitha prince]] Ineluki. Once a purely heroic figure, his ambition and willpower darkened when the Sithi's lands were invaded by savage humans. Dismayed by his people's despair in the face of their approaching doom, he delved into TheseAreThingsManWasNotMeantToKnow and constructed a weapon so terrible that his father the king insisted he destroy it. Maddened by this rejection and by his torments, Ineluki [[SelfMadeOrphan murdered his father]] and took the crown, leading a final, futile resistance against the humans that ended in his death via DangerousForbiddenTechnique. It is deeply unfortunate for the world of Osten Ard that he did not stay dead.
* Rachel from ''Literature/{{Animorphs}}'' spends three years trying not to fall into this as her BloodKnight tendencies slowly but surely turn her into the team's TokenEvilTeammate. She has high points and low points, but generally she manages to keep it together until the events of ''The Return'' and the subsequent unmasking of the Animorphs by the Yeerks. Once she's abandoned the facade of ordinary life entirely what little restraint she had left quickly follows, and one of the last books in the series, ''The Sacrifice'', consists of her mostly just [[KickTheDog kicking one dog after another]]. [[spoiler:Realizing she's fallen into this, she agrees to a suicide mission at the end, knowing she could never fit into normal society again.]]
* ''ASongOfIceAndFire'': Theon was a jerk, but a pretty tame one by the standards of the series. [[spoiler:However after taking over Winterfell and losing his hostages he allows Reek to kill innocent people in a cover up, including two children]].
** He does, however, [[spoiler: start a redemptive arc after being twisted into Ramsay Bolton's "Reek"; at the end of the book, he finally decides to help Jeyne Poole escape the tyranny of the Boltons.]]
[[/folder]]

[[folder:Live Action TV]]
* ''Franchise/StarTrek'' had numerous cases of this. For example, in ''Series/StarTrekVoyager'', it's revealed that after giving the Hirogen holographic technology from ''Voyager'', the Hirogen quickly got bored with the standard holograms and started creating more intelligent holograms to make their hunts better. These holograms eventually became self-aware and rebelled, before freeing others hologram in the area. Even ''Voyager's'' EMH joins their cause, agreeing that this is technically a form of slavery. Unfortunately, they quickly move onto anyone who uses humanoid holograms at all, regardless as to whether those holograms are actually ''sentient''. The Doctor is horrified when their leader brutally murders a man to free the holographic equivalent of ''Clippy''.
* ''Series/TeenWolf'': Lydia references this trope, warning Allison over the phone that Scott might fall off of it, starting with being thirty minutes late for dates and eventually ending up at domestic violence.
* ''Series/XenaWarriorPrincess'' had Najara, a character who either converted or killed criminals. Rather quickly, Najara is revealed to be insane, and can't tell the difference between obvious criminals and lesser offenders.
** See also Calisto, who has a legitimate beef with Xena (Xena killed her family and wiped out her village), but every time she shows up she racks up more collateral damage and DisproportionateRetribution, becoming increasingly less sympathetic in the process.
*** A later episode reveals that Calisto, who has time traveled to the day her parents died, is the one who killed her parents and left her younger self to die. Note that none of this reduces her hate for Xena, showing that she doesn't even care at this point.
* ''Series/{{Supernatural}}'':
** Season 2, "Bloodlust". The Winchester brothers met rogue vampire hunter Gordon Walker while looking for a nest of vampires. Gordon seems like a decent enough chap and a worthy ally, and Dean likes his "kill all the monsters and enjoy the hunt" philosophy. Dean and Sam end up fighting when Sam reveals that other hunters say Gordon is bad news. Before this can go any further, Gordon takes a swandive off the slope when the local vampires turn out to actually be peaceful, having sworn off killing humans, yet he still attempts to slaughter them. Then he tries to feed Sam to the head vampire to prove she's still a monster, and attacks Dean when they try to protect her. Bad move.
** This is Castiel's entire character arc during Season 6. Desperate to defeat Raphael in the civil war in Heaven, Castiel begins performing many morally questionable acts, not the least of which is [[spoiler: allying with Crowley]], and rapidly skipping several shades of grey. This ultimately culminates in the season finale, where he [[spoiler:jumps right into VillainProtagonist territory when he absorbs all the souls of Purgatory and [[AGodAmI declares himself the new God]]]].
** Whilst on a smaller scale, [[spoiler: Castiel's ascension to God and later 'death']] causes Dean to take a much harsher stance on supernatural beings throughout Season 7, most apparent in 'The Girl Next Door'.
* ''Series/{{Angel}}'': During Season 3, Wesley translates a prophecy reading "The Father Will Kill The Son". Not quite sure how to handle the situation, he [[spoiler: takes the baby away - for good - and even strikes Lorne unconscious when he finds out what's going on. To make that even worse, Wesley gets his throat cut and the baby taken away from him. And it was a false prophecy, anyway. Now Holtz has the child and takes him with him into a Hell Dimension, raising him to hate Angel]].
* ''Series/BuffyTheVampireSlayer'':
** In Season 6, Willow goes from [[spoiler: killing Warren]] as revenge for [[spoiler: Tara]] to trying to [[spoiler: kill]] the uninvolved other guys [[spoiler: from the Trio]]. Then to hurting [[spoiler: Buffy, Anya (who initially sympathized with her), and Giles]] and finally to trying to [[spoiler: end the world]]. All within a couple of episodes which together take place within less than one day.
** The Initiative in season four was clearly using questionable methods in their study of demons, vampires, and other paranormal activities, but they were getting the job done and had effectively defanged Spike, one of history's most dangerous vampires. Then they decided that Buffy was a liability and tried to kill her. When it seemed like they were getting back on the slope, they took to torturing Oz (a good werewolf rather than an evil demon) and tried to kill the Slayer again.
** Faith. When she first showed up, she had a lot of problems, not the least of which was that she enjoyed slaying a little too much, but she was definitely a [[AntiHero good guy]]. [[spoiler: Then she accidentally killed a man and the guilt (combined with all the speeches made to her about why she should be feeling guilty) made her snap and go NUTS.]] Later on this happens even more when she gets yelled at for her actions (such as when she tried to kill Angel or saves Buffy and an evil slayer).
** Warren originally created a robot that would obey his every whim, but he eventually abandoned the android because he wanted a girlfriend that would be a partner in the relationship and he fell in love with a woman with her own ideas and personality. His creation of a SexBot and then abandoning it to "die" raises plenty of questions about his character, but he ultimately decides that he wants a woman that he can respect and interact with. In his later appearances in Season 6, he is a misogynistic bastard who tries to brainwash, and eventually kills, his ex-girlfriend because she would not submit to his desires.
* ''Series/{{Battlestar Galactica|2003}}'': Given that ''the entire cast'' has been through hell backwards by the end of the pilot miniseries and it just goes FromBadToWorse after that, this trope is kind of understandable...
** The "Pegasus" arc has been accused of this by some critics, with Admiral Cain taking about twenty minutes to go from merely being a hardassed martinet to ordering the rape of a pregnant woman as a JackBauerInterrogationTechnique and sentencing the crewmen who interfered to summary execution. In fact, the episode "Pegasus" had had to be radically trimmed to fit network time constraints; some of the footage that was lost (and reinstated on the DVD) implied the passing of more time than seems to go by in the episode as aired. The ''Razor'' movie, which came later, also expanded on her backstory; she was already a little unbalanced even before the fall of the Twelve Colonies, at which point something... ''[[DespairEventHorizon broke]]'', thus retconning the events of "Pegasus" into more of a VillainousBreakdown.
** There's also the episode where the woman put in charge of a tribunal takes about 24 hours to go completely nuts with power, and attempt to accuse the commanding officer who appointed her of the crime she's investigating.
** Similarly, in the 'Black Market' episode, the leader of the organisation running it does a pretty good job of defending the need for a BlackMarket in the fleet. Then he talks about having child prostitutes, so [[spoiler: Lee can shoot him without feeling guilty]]
*** Lee did acknowledge the argument about the need for a black market, though, given that he allows it to stay in business afterwards. He just wanted them to clearly understand where the MoralEventHorizon was.
* Seems to happen about once a season in ''Series/DoctorWho''. A few notable examples;
** In ''The Mind of Evil'', a scientist invents a machine that removes criminal impulses from the human mind, and offers it to the government as a means of dealing with dangerous criminals without resorting to the death penalty. Turns out its inventor is actually the Master and the device brainwashes people to serve him.
** In ''Genesis of the Daleks'', Davros invents the Dalek (or "Mark III Travel Machine", as he initially calls it) ostensibly for the purpose of making life easier for mutated Kaleds. When his superiors start getting cold feet about the research, he has the entire Kaled race wiped out.
*** The audio drama ''Davros'', released much later, showed that Davros was already lying in a heap at the bottom of the slope by this point. Not hard, when you're the leading [[MadScientist scientist]] of a race of [[ANaziByAnyOtherName ersatz Nazis]]...
** The original Daleks in "The Daleks" do this too. They're paranoid and threatening, but as the result of a nuclear war with another race that devastated their country and turned them into mutants incapable of surviving outside of travel machines in a specially-built environment with metal floors. While they trick the humans into it, all they really want is anti-radiation drugs which would allow them to leave their suits. It then turns out that their bodies have adapted to need radiation and the withdrawal sends them mad before killing them, so they decide to shoot out a load of radioactive waste onto the planet again when they realise they couldn't survive without radiation.
** In "Rise of the Cybermen", when the British government refuses to fund John Lumic's Cyberman research, he kills the leadership and begins forcibly cyber-converting the British population.
** In "The Unquiet Dead", gaseous beings called [[OurGhostsAreDifferent the Gelth]] need to [[PuppeteerParasite animate human corpses]] to house themselves and hence survive creepy, if not evil. [[GenocideDilemma They ask to come]] to Victorian Cardiff, and the Doctor, dismissing the {{Squick}} of his companions, agrees. After the Gelth come through, however, it turns out [[ILied they lied]] about their numbers and intentions. They want to take over all of Earth's ''living'' bodies but even before we learn this, we can tell that they're malevolent, because shortly after getting the Doctor's go-ahead, they [[GoodColorsEvilColors switch from pale blue to bright red and Satanic]]. Apparently, they were "demonic" all along, see?
** "Partners in Crime" begins with an alien conspiracy that... helps people lose weight effortlessly by giving them pills that cause one pound of fat to turn into an adorable little creature called an Adipose every night. While this comes off as slightly sinister, it's hard to see how they could ever be an enemy- until, of course, the "breeders" of the Adipose decide that their current method is too slow and try to make Adipose out of the entire body of their victims, killing them in the process. Jumping? More like a great, flying leap.
** The Doctor himself jumps from the top of the slope to the bottom in the last 10 or so minutes of "The Waters of Mars". After having spent the whole episode with a group of people destined to die, the Doctor snaps and decides to save them after most of them have already been killed. Just moments after saving the remaining people (in the most epic way possible), the Doctor decides that he can mess with the timeline in any way he sees fit, completely ignoring his species' laws. At this point, the Doctor is almost antagonistic. Thankfully the Doctor is only in this state for one scene, and is brought down a couple of pegs before he can really do anything.
** It's implied in "The Runaway Bride" and more-or-less stated in "Journey's End" that the reason the Doctor travels around with a companion is so that he has someone to remind him not to do this, since he has so much power and gets into such intense and painful situations it would be hard for him not to slip, and hard for anyone to stop him once he starts sliding.
* Holly in ''Series/SlingsAndArrows'' wants to streamline the Festival's business end and replace most of its Creator/WilliamShakespeare with musicals. This is only marks her as a villain in the context of a show where Shakespeare is SeriousBusiness, until she starts abusing her boyfriend and deliberately aggravating the heart problem of a board member who disagrees with her.
* Gerak in season 9 of ''Series/StargateSG1''. At least he got a [[RedemptionEqualsDeath redemptive death]], though.
** The Ori could stray into this. At first it seems that, while their practices are primitive, their ultimate goals are noble enough, helping others to achieve ascension. Then it's revealed that this is all a lie, and the Ori are manipulating people's belief to gain more power.
*** The rogue NID. At first they're stealing alien technology with the purpose of using it to defend earth, making them into {{Knight Templar}}s. Then it turns out they're just in it for the money.
* Similar to the ''Magnum Force'' example, season two of ''Series/MurderOne'' featured a storyline about Clifford Banks, a serial killer who tracked down and executed criminals who escaped justice, or had an unsuitably short prison sentence. He started out on this path through the murder of his retarded brother, he never kills innocent people, and throughout the arc a few people comment that "sometimes the streets need sweeping." Any moral ambiguity is then done away with by the lawyers finding out that Clifford actually killed his brother himself over his frustration about giving up his whole life to care for him, causing a mental breakdown that directed his guilt outwards onto other criminals.
* In the pilot episode of ''Series/TheShield'', Vic Mackey partakes in numerous criminal acts including the use of excessive force during arrests, working with a drug dealer and beating a suspect with a phone book in order to make him talk. Then, at the end of the episode, he [[spoiler:shoots another police officer in the face to prevent him from gathering evidence against Vic's team]].
* An episode of ''Series/TheCommish'' features a VigilanteMan who initially only humiliates bad guys who deserve it. But when an accused rapist/murderer is found not guilty (for good reason), the vigilante (who believes he got OffOnATechnicality) clubs him to death, setting the team on his case.
* The season 8 finale of ''Series/{{Smallville}}'' took an incredible amount of heat for various reasons, and one of them was this trope.
** Season 9 had [[TwoLinesNoWaiting multiple concurrent threads]] of [[WellIntentionedExtremist Well-Intentioned Extremism]] colliding into one big [[SelfFulfillingProphecy Self-Fulfilling prediction of doom]]:
*** Tess Mercer established an alliance with the Kandorians to [[GreenAesop save Earth]] from mankind's destructive ways but in the BadFuture, [[spoiler: she [[LesCollaborateurs collaborated]] fully with Zod's despotic rule over a dying human populace.]]
*** Amanda Waller as the head of Checkmate employed threats, murders, and kidnappings to prepare for a coming [[ApocalypseHow war against the aforementioned Kandorians]]. Then she [[spoiler: casually ordered the execution of a group of [[BroughtDownToNormal non-powered Kandorians]],]] cementing her status as a {{Fantastic Racis|m}}t.
*** General Zod's interest in restoring his and his fellow Kandorians' powers (against Clark's objections) made sense in light of the repeated violent threats they faced from Amanda Waller and other humans ProperlyParanoid about aliens among them. [[spoiler: After Zod and the Kandorians get their powers restored, he destroys Checkmate, kills Faora (and their unborn child) for going against him, and plans to take over Earth with the Kandorians loyal to him and make it into a New Krypton.]]
* Several characters in the 1998 ''{{Series/Merlin|1998}}'' series, but most notably [[MurderTheHypotenuse Uther]] and [[GodSaveUsFromTheQueen Mab]].
* Likewise, in the later ''Series/{{Merlin}}'' BBC series, Morgana was understandably angry and bitter, but nevertheless sympathetic. However, between seasons two and three, she transformed into a smirking villain.
* In one episode of ''Series/{{Monk}}'', when Captain's Stottlemeyer's wife is gravely injured in the fallout of a union assassination, Stottlemeyer proceeds to teeter dangerously close to the edge in his hunt for the sniper. [[spoiler:Near the end, he very nearly launches a raid on the suspected union until Monk manages to crack the case.]]
* ''Series/{{Fringe}}'': Walternate originally just wanted to save his universe, even if it meant destroying a parallel universe and its inhabitants. Then he attempted to [[spoiler: kill his son and the mother of his grandchild.]]
* An episode of ''Series/MacGyver'' involved a business owner attempting to have the Challengers Club shut down because one of its members stole a truck from his printing business. What could have been a two sided conflict between a racist business owner - albeit one who had a legitimate axe to grind - and a teenager conditioned by poverty and racism to view white people as the enemy shifts step by step into a case of the boy being a clear cut victim of The Man. First it turns out the business owner framed the kid for stealing the truck as a pretext to have the Challengers Club shut down. Then he escalates to murdering the club owner. Then it turns out he prints white supremacist propaganda and thinks "niggers should be drowned at birth".
* ''Series/TwentyFour'' does so respectively with Tony Almeida and Jack Bauer in its final two seasons. In Tony's case, [[spoiler: After his wife and unborn son were killed, he sets out to kill the mastermind in any way possible. But tactics he employs in trying to do so include things like murdering the director of the FBI, nearly exposing several innocent people to a lethal pathogen, and attempting to sacrifice Jack in order to get close to his target.]] As for Jack, after years of being tortured, screwed over, and having friends and loved ones taken from him, he finally loses it when [[spoiler: Renee Walker is killed as part of the Russian's cover up and the President betrays him by refusing to reveal the truth since exposing them would also expose their involvement in the murder of a foreign president, which in turn would ruin the chances of a peace treaty she's trying to have signed. Jack claims that he'll take justice into his own hands and expose the truth, but his doing so involves murdering TheMole solely because had been working with the Russians beforehand ''long before'' there was any movement made to kill Renee, slaughtering several members of the Russian government, ''opening fire on a crowd of innocent people'' (which although it was mainly to disable random pedestrian cars, it's still made perfectly clear that Jack could have easily killed someone with even the slightest slip-up and really didn't give a damn at all) and attempting to assassinate both Yuri Survarov and Charles Logan even though killing the both of them would be guaranteed to start a war between the USA and Russia that would likely lead to the deaths of millions.]] The series does its best to make sure that what he's doing isn't in ''any'' sort of heroic light.
* ''Series/{{Charmed}}'' has a twist on this in Season 2's "Morality Bites"; after the sisters use their powers to pull a vengeful yet relatively harmless prank on a man who continually lets his dog defecate on their driveway, Phoebe has a premonition of being burned at the stake for killing someone with her powers a decade in the future. One adventure later, they are sent back to that point in time to prevent falling prey to this trope, worded well by Phoebe:
-->'''Phoebe''': Once you break the small rules, it's just a matter of time before the big ones are next.
* ''{{Series/Hannibal}}'': Will goes from doing some morally ambiguous, but still understandable things, (such as trying to have Hannibal killed) to something unambiguously evil in the episode ''Naka-Choko".
** Of course [[spoiler: it turns out to be a con to convince ''Hannibal'' that he'd gone slope-jumping. And it worked, for a while.]]
* Season 2 of ''Series/AgentsOfSHIELD'' had an interesting ethical dilemma set up between S.H.I.E.L.D., who felt that people with superhuman abilities needed to be indexed and monitored to protect regular people from them in case they ever became dangerous, and the Inhumans, who felt their rights were being taken away and such policies would inevitably lead to wide-scale imprisonment or extermination. Any question of who had the moral high ground went out the window when Jiaying, the Inhumans' leader who had been corrupted by a brutal vivisection at the hands of Dr Whitehall, a member of HYDRA, murdered a S.H.I.E.L.D. representative in cold blood at a peace meeting and framed it to look like S.H.I.E.L.D. was attacking them, then set up a trap to draw as many S.H.I.E.L.D. agents as she could to an aircraft carrier she had hijacked and planned to flood with synthesized Terrigen Mist, which would kill any non-Inhumans who were exposed to it. Her power, previously assumed to be longevity through a HealingFactor, was suddenly revealed to require her to literally drain the life out of other people to sustain herself (granted, she originally hated this power until her vivisection), which she attempts on ''her own daughter'' (who also happens to be an Inhuman) after she [[CallingTheOldManOut calls her out]] on the above plan and tries to stop her.
[[/folder]]

[[folder:Tabletop RPG]]
* ''TabletopGame/VampireTheMasquerade'' has an actual mechanic for this: acting like an inhuman, unprincipled bastard will make you more of an inhuman, unprincipled bastard.
** This applies to all World of Darkness games and is a large part of [[TabletopGame/NewWorldOfDarkness the new system]].
** [[TabletopGame/OldWorldOfDarkness The old system]] is an aversion; the more humanity you lose, the harder it is to lose the next point, the more extreme your behavior has to be. Only if you're determined to destroy your humanity (or your Gamemaster paves your path with {{Sadistic Choice}}s) can you slip past a certain point, but it wouldn't happen by accident.
*** It isn't supposed to be an aversion because as the character's [[KarmaMeter Humanity]] drops, the character's sense of morality does as well. Yes, by the time your Humanity is down to 3, say, it takes doing something truly depraved to drop it any further, but by the time you're down that far, you consider murder to be roughly the equivalent of breaking the speed limit, so there isn't much keeping you from going even farther. However, since in reality a player character's morality is determined by the player, in practice this rarely comes into play.
* Chaos in ''TabletopGame/{{Warhammer 40000}}'' is grease on the Slippery Slope. As Chaos is a sentient form of TheDarkSide by way of TheCorruption, this trope becomes rather understandable.
** The entire theme of the Alpha Legion in 'Legion'. They are a secretive legion who achieve victory through the best means necessary, even if it means the deaths of hundreds of Guardsmen, but are still loyal to the Emperor. However, at the end of the book, they [[spoiler: join the forces of Chaos, believing it's what the Emperor would want.]] Though it is possible they only wanted it to look like they had jumped off the slope so that they could manipulate Horus into losing the war.
** Tau as well, when one considers that its for the greater good for sterilization policies, and special "helmets" for their bug allies.
** The Inquisition contains two major factions: Puritans and Radicals. Puritans are the standard "burn the planet to ashes if there's a hint of Chaos on it" guys, while Radicals are the ones willing to use chaos against itself (i.e., get a guy possessed by a demon so he can use stupidly powerful magic or wield possessed weapons). Strangely, Radicals tend to be ''older'' than Puritans, it's implied seeing a lifetime of fighting against Chaos have so little effect they start using TheDarkSide. Pretty much all of them end up falling to Chaos anyway.
* ''TabletopGame/{{Exalted}}'': Averted. [[DealWithTheDevil Pledging yourself]] as an [[BlackKnight Abyssal]] or [[KnightInSourArmor Infernal Exalt]] might seem like this trope, since it requires pledging loyalty to the [[OmnicidalManiac Deathlords]] or [[AbusivePrecursors Yozis]], respectively. However, it's entirely possible (if not somewhat difficult) to [[TheAtoner go renegade]] and do your own thing, if you decide that being a CardCarryingVillain is for suckers.
** Then there's the demons, dead and [[TheFairFolk raksha]] themselves, who tend to be [[AlwaysChaoticEvil less evil]] and more along the lines of a BlueAndOrangeMorality. Demon summoning is a fairly common practice for everything from construction to medicine to entertainment, some places in Creation have regular interactions with the denizens of the Underworld, and TheFairFolk make great trade partners because of their ability to buy and sell immaterial concepts (like dreams and emotions).
** Played straight with the akuma, who allow themselves to be completely remade as agents of the Yozis in exchange for power. However, given [[DarkAndTroubledPast the circumstances]] that lead many to become akuma, they tend to be a WoobieDestroyerOfWorlds.
[[/folder]]

[[folder:Video Games]]
* ''VideoGame/InjusticeGodsAmongUs'' has a lot of this: Franchise/{{Superman}} doesn't just jump, he flies in the highest speed he can through the slope after being tricked into killing Lois and then killing Joker in retaliation, establishing a totalitarian dictatorship where in exchange of his "protection", everyone that even dares to protest his method get swift death, as exemplified by what happened to that universe's Green Arrow [[spoiler:and later Shazam, and according to the backstory, Hawkman, causing Hawkgirl to retaliate in vengeance, only to be {{Brainwashed}} into servitude]]. He does it a second time when he goes from maintaining order with an iron fist -- and demonstrably creating a peaceful world at the expense of a few lives, and freedom of course -- to flattening cities himself because people don't agree. Via backstory, we see the only surviving ComicBook/TeenTitans being Cyborg and Raven; both end up disillusioned and Raven ends up giving in to Trigon's influence, gaining a lust of torture and becoming Trigon's worshipper instead of trying to prevent his coming. And while Damian Wayne [[spoiler:did accidentally kill Dick Grayson, he didn't look back in regret and goes far worse than before because Superman, being his 'new father figure', got to convince him to stay in the extremist way]]. Meanwhile, Wonder Woman is unquestioningly convinced of Superman's "logic" for some reason, even after it gets clearly to the point of just doing those things he's supposed to be preventing. One man jumping off, the others follow suit in varying level.
* In ''VideoGame/{{BioShock|1}}'', [[spoiler:harvesting more than two of the Little Sisters gives you the bad ending; it is simply implied that you jumped off the slope and became ADAM- and power-hungry the moment you first harvested]].
** Andrew Ryan. The whole point of Rapture was to create a utopia where individuality and free enterprise were unrestrained by the government. Once Fontaine began to rise in power though, paranoia and a fear of losing his city turned him into an ironfisted, totalitarian dictator, [[HeWhoFightsMonsters the exact opposite of what he set out to become]].
** And in ''VideoGame/BioShock2'', if the player jumps off the slope [[spoiler: so does Eleanor.]]
* In ''VideoGame/NeverwinterNights'', Aribeth leaps quite quickly down the slippery slope (partially excused as Morag is messing with her brain and her intentions)
* Subverted in ''VideoGame/RondoOfSwords''. After a very harsh FriendOrIdolDecision that ends up on the favor of the Idol, Serdic experiences an immediate Karmic backlash, complete with [[DarkMessiah title change]], [[DiscardAndDraw power swap]], and [[EvilMakeover costume switch]] to reflect his [[ShootTheDog dog shooting]]. While his Nakama repeatedly [[WhatTheHellHero accuse or suspect him of jumping off the slope]], Serdic experiences no lapse in emotional or moral health. The epilogue also reveals that he was a just and well-loved ruler with a happy marriage.
* CJ and Niko Bellic from ''VideoGame/GrandTheftAutoSanAndreas'' and ''VideoGame/GrandTheftAutoIV'', respectively. Let's assume that they're good-hearted people at the start (if the cut-scenes are any indication), and let's assume the player doesn't do any killing not encouraged by the storyline (which is a stretch, but go with it). Now watch how their lives unfold. CJ in particular goes from "I guess I'll kill this guy since he's been screwing with my gang" to "guess I'll just kill all these guys for no apparent reason" so quickly it might make you wonder if you're still playing as the same guy.
** Well, Niko may seem pretty nice at the beginning of the game, but the plot [[spoiler:eventually reveals that he is a war criminal out to kill other war criminals]]. So there's a good argument that he starts the game as a major bad guy, and indeed committed even more horrible acts before the game started than you can ever do in it.
* ''VideoGame/MegaManX 8'' has [[spoiler:Lumine, a New Generation Reploid, and director of the Orbital Elevator project. ''He's the '''BigBad''''', '''not''' Sigma this time]].
** It doesn't help that the whole of [[spoiler: Lumine]]'s tale plays on the game's subtitle, ''Paradise Lost''. [[spoiler: Lumine is the analogue to Satan, rising against his creators and their vassals. He even seems to have enough truth in his words to shake up X into being completely unable to attack.]]
* It used to be that when the ''VideoGame/{{Warcraft}}'' series needed a new villain, Blizzard would seem to throw a dart at a character board and have the one they hit go insane.
** Kael'thas Sunstrider's goal was originally to improve his suffering people, and despite their re-branding as blood elves, they were a shining example of DarkIsNotEvil. Even when he allied with the [[SnakePeople naga]], and the [[WellIntentionedExtremist partially demonic Illidan]], it was a move of desperation and managed to be the [[OnlySaneMan moral center]] of the group. In Burning Crusade, he's killed as part of Illidan's army, but then he CameBackWrong to reveal he had betrayed him to the Legion and was trying to summon Kil'jaeden so the Burning Legion can destroy Azeroth, killing his own people when they tried to stop him. It's heavily implied that point either the fel magic reanimating him just threw him completely off the slope, or his corpse was just being used by a demon that took on traits of his personality and memory.
** Illidan was always a self-serving JerkAss, but he had a more gentle side to him and never intended his collateral damage. After nearly being killed by Arthas, though, that gentle side was replaced in Burning Crusade with paranoia, insanity and a desire to crush anyone he deems as a threat, which happens to be ''everyone not on his side.'' The jump was severe enough that Blizzard went [[WordOfGod on record]] expressing a desire to bring him back for a proper redemption. He finally returns in ''Legion'' once more a morally ambiguous character whose positive sides are seen in greater light.
** Malygos from ''VideoGame/WorldOfWarcraft'' goes from a dragon who wants to rein in mortal spellcasters because he disapproves of their methods to a dangerously extreme tyrant who seems genuinely unaware that his plan to redirect and control magic has an excellent chance of ''destroying Azeroth''.
** Garrosh Hellscream was always a JerkAss with DaddyIssues, but when Thrall put him in charge of the Horde, he began committing war crime after war crime (eventually addressed in the novel appropriately titled: ''War Crimes''). The most notable jumping point though, was probably using a mana bomb (essentially a nuke, complete with its own analogue for radiation) on Theramore, a city that was founded on and campaigned for peace. Just in case that wasn't enough though, he essentially says to heck with his own people, restores the heart of an EldritchAbomination at the cost of a sacred location, and [[https://www.youtube.com/watch?v=slzQOyS5TqQ declares war on the world]].
** The [[KnightTemplar Scarlet]] [[HeWhoFightsMonsters Crusade]], at least those located within the Scarlet Monastery in Tirisfal Glades can [[FantasticRacism be]] [[WitchHunt accused]] [[ColdBloodedTorture of]] [[KillItWithFire this]]. This in contrast to their forces in the Eastern Plaguelands, who can be sorta excused for their most evil actions due to [[spoiler: their leader being actually a Demon, [[UnwittingPawn who was manipulating them]] to fight the Scourge and [[VanHelsingHateCrimes the sentient undead of the Forsaken]], and then following his {{Villainous Breakdown}} outright [[{{Irony}} kills them all and raises them as undead]].]]
** And, while we're on Warcraft games, as you play the human campaign of Warcraft III, Arthas starts out as a dedicated disciple of Uther Lightbringer (even though Arthas is a prince, Uther's military rank is higher than Arthas's, and they both respect that) but gradually starts getting more and more desperate in his fight against the Undead. Eventually, [[spoiler: he totally betrays Azeroth, dresses in Undead armor, and kills his own father]]. In his case his though, while he had a decline, the [[MoralEventHorizon jumping point]] was the result of taking up a cursed sword that he was too desperate to realize was a trap that stole the soul of ''anyone'' it touched.
* Arcturus Mengsk of ''VideoGame/{{Starcraft}}'' started out as a dashing rebel leader who saved you and Jim Raynor from the Confederacy for killing Zerg. The first time he used a psi emitter to summon the Zerg it was a military target and the rebels helped the majority of civilians flee. Then he dumped several on Tarsonis, a planet with a population of two ''billion'', before attacking the Protoss who came to stop the Zerg, using the orbital defenses to stop anybody from fleeing, and abandoning his second-in-command to the Swarm.
* In ''MitadakeHigh'' it is common for someone to RP themselves going insane as a result of the madness going on around them. Unfortunately, not everyone is any good at it.
* In ''[[VideoGame/FireEmblemTellius Fire Emblem: Path of Radiance]]'', the country of Crimea is good with bits of gray, Daein is dark gray but with evil leaders, and conservative Begnion was in the middle with its corrupt Senate but well-intentioned leaders. When the sequel rolled around and Begnion became be the main antagonist, it became more ruthless.
* ''VideoGame/FinalFantasyVII'' - Sephiroth is initially the best SOLDIER in the world, but after finding out a certain fact about himself, he becomes a murderous psychopath, slaughtering the population of a village and burning it to the ground, and then sets out to destroy the world.
* In ''VideoGame/FinalFantasyXI'' [[spoiler:after the woman that he loved was killed and he was left for dead by Ulrich during the Multinational Expedition to the Northlands, Raogrimm kills Ulrich. Then he hunts down and murders the rest of the people in the Multinational Expedition because they knew that Ulrich had done something and didn't say anything about it. Then he gets a giant "Slip 'N Slide" and whisks down the slope gleefully as he declares war on the human nations and nearly destroys the world. Mind you, some of it may have been the Dark Divinity Odin fanning the flames of his rage, but still... Although, Ulrich's actions during the Multinational Expedition could be considered the ultimate slippery slope, since they were the cause of pretty much all of the major, world-threatening troubles that Vana'Diel has faced in the following 30 years were stemmed from his (accidental) murder of Cornelia.]]
** Subverted in the ''Rise of the Zilart'' expansion as [[spoiler: Kam'lanaut and Eald'narche were always trying to [[TheEndOfTheWorldAsWeKnowIt "open the Gates to Paradise"]].]]
* So many in ''VideoGame/DragonAgeII'', a game where [[GreyAndGrayMorality no one is really evil and no one is truly good]]. By the end of the game, both of the leaders of the two warring factions give into their inner demons with [[spoiler: Meredith, the Knight-Commander of the Templars calling for the execution of all mages in the city of Kirkwall for the actions of just one rogue mage who also jumped off the slippery slope and First Enchanter Orsino, leader of the mages, using BloodMagic in an act of despair.]]
** Both slopes were [[TheDarkSide greased with phlebotinum]] in this case; [[spoiler: Meredith was being corrupted by the lyrium idol in addition to her own paranoia, and the rogue mage was possessed by a demon of Vengeance.]]
** Actually, in the case of [[spoiler:: Orsino he was not possessed by a demon but instead used Blood Magic to turn himself into an abomination of human flesh. The rogue mage was actually Anders, who corrupted a spirit of justice and turned it into of spirit of vengeance, and depending on your interaction with him was either possessed, or willingly blew up the chantry and single-handedly plunged the world into war. Because he willingly allowed the spirit to possess him, its debatable when, and how many times, Anders went off the slope as he is a well-intentioned extremist throughout the game, but before, in Dragon Age: Awakening, there was little, if anything, to hint that he would even become remotely extreme.]]
* Adele in ''VideoGame/ArcRiseFantasia'' jumps right off the slope and onto the [[AxCrazy crazy train]] the ''very instant'' she finds out that she's an [[ChildhoodFriendRomance Unlucky Childhood Friend]], taking this trope to a ''terrifying'' degree.
* The Protagonist from the ''VideoGame/SaintsRow'' series gleefully leaps headfirst off of the slope, and then proceeds to nuke it. In the first game, you start off as a [[HeroicMime (mostly) silent]] henchman who more or less indifferently does what Julius, Gat, Lin, Troy, and others tell you without hesitation, and you seem to be a pretty sane individual. While you are killing, you're killing the other gangs for peace, and the cops you kill are corrupt anyway (of course, not counting civilian casualties in your gameplay rampages). But in Saints Row 2, after being betrayed by Julius and being blown up and disfigured to the point of needing severe plastic surgery ([[GameplayAndStoryIntegration which is really just an excuse to make a new character]]), it's implied that you went insane and very much stated that you're paranoid, corrupt with power, take deep pleasure in murder, is only after the city, and nothing short of evil- the only people outclassing you are [[AssholeVictim the gangs you fight and their leaders]], but not by much. As the game goes on, it becomes clearer and clearer that you're not very interested in wiping out the city for peace anymore as your actions become more and more violent and CrazyAwesome, [[BerserkButton especially after two of your homies get murdered]]. The only person who ever stood a chance of stopping you, your old boss Julius, turns out to have done it because he [[GenreSavvy savilily]] [[TooPowerfulToLive realized that you were a dangerous person]]; you kill him while happily stating you have full intentions of taking over the city in any means necessary.
** Johnny Gat qualifies as well.
** SaintsRowTheThird plays this with most if not all of the main characters, and they each suffer for it. Boss, Gat, Shaundi, Loren, Killbane, Kiki, Temple and Kia are just some of the names who are guilty of this, and all either die or with the exception of Boss can be killed. Boss arguably gets it even worse if s/he chooses to jump off the slippery slope: s/he reverts back to being worse than ever, and a thoroughly despicable person.
* The Illusive Man from the ''Franchise/MassEffect'' trilogy takes a flying leap off the slope in ''VideoGame/MassEffect3''. Whereas before he was a WellIntentionedExtremist who tended toward a lot of ShootTheDog moments in his zeal to protect humanity, in the third game he flies straight off the rails and starts using Reaper technology to assemble a massive army of BrainwashedAndCrazy {{Mooks}}, ordering the murders of civilians, and actively working to undermine the Alliance and the Council in their efforts to defend the galaxy against the Reapers. Eventually, it's revealed that he has completely hurdled the MoralEventHorizon with [[spoiler:Sanctuary, a supposed safe haven for refugees from the Reaper attacks, which turns out to be a laboratory where the refugees are forcibly converted into Husks as part of his research into finding a way to control the Reapers]].
** Explained by the fact that he was [[spoiler:indoctrinated by the Reapers for the entire game.]]
* The ''VideoGame/GodOfWarSeries'': As shown in the [[VideoGame/GodOfWar first game]] and [[VideoGame/GodOfWarAscension its]] [[VideoGame/GodOfWarChainsOfOlympus prequels]], Kratos was always a SociopathicHero at his worst and an AntiHero at his best, but from the [[VideoGame/GodOfWarII second game onwards]], his [[RevengeBeforeReason obsession with revenge]] against the Olympians causes him to devolve into a straight-up VillainProtagonist. In the [[VideoGame/GodOfWarIII third game]], he [[spoiler:indiscriminately kills the gods and essentially brings about TheEndOfTheWorldAsWeKnowIt just for his revenge]].
* ''VideoGame/CallOfDutyAdvancedWarfare'': Irons is a firm believer that HobbesWasRight, and plans [[spoiler: to unite the world under Atlas after toppling the world's governments. After a conventional invasion of the United States fails and the free world unites against him, Irons' next course of action is to hit every military installation in the world with biological weapons that'll kill anyone not registered with Atlas.]]
* In the ''VideoGame/StarTrekOnline: Delta Rising'' mission "All that Glitters", Vaadwaur leader Gaul lures you to a meeting with what sounds like an offer of a peace settlement, with the stipulation that the Kobali release to him the cache of stasis chambers containing Vaadwaur soldiers from the 15th century whom [[DesignatedHero they've been using as reproductive stock]]. Sounds perfectly reasonable at first, but then he says he wants the Alliance to pull a FaceHeelTurn. Upon being informed that the Federation-led alliance wants ''actual'' peace, as in an end to the Supremacy's war of conquest, he loses his shit, starts gunning down Talaxians, and [[NeverMyFault blames you for it]].
* The ''[[Franchise/TheWitcher Witcher]]'' games might as well be called "Radovid of Redania Jumps Off the Slippery Slope". In the [[VideoGame/TheWitcher first game]], he's a pragmatist who seems genuinely horrified by what his allies of convenience got up to. In the [[VideoGame/TheWitcher2AssassinsOfKings second]], he's a ruthless bastard who tortures people and takes every opportunity to expand his domain. In the [[VideoGame/TheWitcher3WildHunt third]], he's a murderous fanatic who even makes [[EvilEmpire Nilfgaard]] look good by comparison. All of this takes place over less than a year of in-universe time.
* ''VideoGame/{{Prototype}}'': In the first game, [[ArmiesAreEvil Blackwatch]] was at least attempting to contain the infection, if in a brutal, violent, and ruthless manner. By the [[VideoGame/{{Prototype 2}} second game]], they've reached the point where they're deliberately kidnapping civilians just so GENTEK scientists can run "experiments" on them involving throwing Infected beasts at them and watching them get shredded. Dialogue from the Blackboxes also further underscores Blackwatch's expanding psychopathy, including a recording of a Blackwatch soldier shooting an autistic boy on the mere suspicion that he was infected, another Blackwatch soldier shooting a woman immediately after warning her he was authorized to use lethal force if she didn't step back, an officer threatening to discharge another Blackwatch trooper for ''saving a woman from being raped'', a recording from Colonel Rooks explicitly stating that it isn't their responsibility to police the refugees even when they start killing each other, and an officer berating a subordinate for shooting an entire family ''because he was wasting ammo''.
* ''{{Franchise/Halo}}'':
** The Ur-Didact, the villain of ''{{VideoGame/Halo 4}}''. In the [[Literature/HaloCryptum first]] [[Literature/HaloPrimordium two]] novels of ''Literature/TheForerunnerSaga'', he starts off as a conflicted general who strongly disliked humanity and believed that the Forerunners were the rightful masters of the galaxy, but nonetheless also grew to respect humans as fellow warriors, and believed that the Forerunners also had a responsibility to protect and preserve even those species who would stand against them (except [[TheVirus the Flood]], obviously), opposing [[GodzillaThreshold the firing of the Halos to stop the Flood]] precisely because it would kill off ''all'' sentient life in the galaxy. And then he gets {{Mind Rape}}ed by the Flood Gravemind, an experience which magnifies his Forerunner supremacism and dislike of humanity into ANaziByAnyOtherName levels. Afterwards, he comes to the conclusion that the only way to defeat the Flood without using the Halos would be to transform his Promethean followers into robotic abominations; when he starts running out of volunteers, he begins forcibly converting humans (making him NotSoDifferent from the Flood), with the intent to eventually wipe out ''all'' humans and any other species who oppose Forerunner rule. The Ur-Didact's transition from tragic hero to [[DarthVaderClone genocidal dictator in skeleton armor]] is covered in ''VideoGame/HaloSilentium'' and the ''Halo 4'' terminals.
** TheReveal of ''VideoGame/Halo5Guardians'' pulls this with [[spoiler:your AI companion Cortana]], who in the [[VideoGame/{{Halo 4}} previous game]] [[spoiler:remained the Chief's friend even as her digital body collapsed and she struggled to remain sane, eventually doing a HeroicSacrifice with the last of her strength]]. In the following game, [[spoiler:she turns out to be alive and supposedly repaired, but now she's at best WellIntentionedExtremist who's going to take over the galaxy with her army of enormous Guardian machines. While she keeps insisting that she has good reasons for doing so]], it's clearly bordering on WouldBeRudeToSayGenocide, especially when [[spoiler:she imprisons Chief and Blue Team in a Cryptum so they won't interfere with her schemes]].
[[/folder]]

[[folder:Webcomics]]
* In ''Webcomic/TheOrderOfTheStick'' paladin Miko Miyazaki starts out as a narrow-minded, HolierThanThou KnightTemplar who the titular Order despise and even her own comrades tend to look for excuses to send her off on missions to distant lands that keep her out of town for long periods. Then she [[spoiler:overhears Lord Shojo talking to Roy and Belkar about their plans to do the dirty work behind the paladins' backs, ignores his [[IDidWhatIHadToDo perfectly good arguments about why he had to do it,]] declares him guilty of treason and executes him on the spot. She's IMMEDIATELY stripped of her powers by the gods for murdering an unarmed octogenarian and goes into a psychotic breakdown when she refuses to accept that she could have been wrong.]]
** [[spoiler:Vaarsuvius]] took a jump, too. See comic [[http://www.giantitp.com/comics/oots0639.html #639]]. Though debates on whether this counts as PayEvilUntoEvil, and whether that stops it being this trope, rage on the forums endlessly.
*** As said by [[spoiler:the fiends]], the best way to get a good person to do horrible things is to convince them that they aren't responsible for their own actions.
* [[spoiler:Wanda]] from ''{{Webcomic/Erfworld}}''. [[spoiler:Ever since she attuned to the Arkenpliers, she has become more and more sadistic and cruel, to the point that, when the team's Foolamancer is injured and unconscious, she says they should ''kill and zombify'' him instead of healing him, simply to save on resources]].
** [[spoiler: It ends up being subverted in that Jack knew something that Parson really needed to know, but Jack was contractually obligated not to tell anyone [[ExactWords for the rest of his life]].]]
* The inspector in ''Chisuji''. First he decided to take justice in his own hands against the criminal who killed his wife and put his daughter in a coma; then he saw the killer's girlfriend holding said daughter's plush toy, and... [[DiscretionShot snapped]].
* Eridan in ''Webcomic/{{Homestuck}}'' was introduced as a ButtMonkey IneffectualSympatheticVillain JerkWithAHeartOfGold, but some of his later appearances have shown that [[spoiler:he pulled a FaceHeelTurn and plans to ally with the BigBad, then proceeds to slaughter his teammates and destroys the one thing that could have saved his people, which he was ''trying to protect''.]]
* ''WebComic/VampireCheerleaders'': At the beginning of the comic, Heather is seemingly sweet and somewhat naive, until she's initiated into the Bakerstown High cheerleading team, where she chose to become a vampire. At that point, she reveals [[BitchInSheepsClothing her true colors]], as her first order of business was to use her newfound powers [[http://www.vampirecheerleaders.net/strips-vc/meet_the_parents_3 to turn on her parents]] and, under [[AlphaBitch Lori's]] instruction, [[http://www.vampirecheerleaders.net/strips-vc/meet_the_parents_8 made them her thralls.]] They spend the remainder of the story [[http://www.vampirecheerleaders.net/strips-vc/money_bags as her mindless slaves.]]
[[/folder]]

[[folder:Western Animation]]
* The ''WesternAnimation/BatmanTheAnimatedSeries'' episode "Lock-Up" introduced Lyle Bolton, ruthless head of security at Arkham Asylum, who eventually goes crazy and becomes the supervillain Lock-Up. He starts off making some good points about his regime bringing Arkham's role as a CardboardPrison to a halt. Fortunately - so to speak - he also turns out to be a sadistic monster who steps way past his boundaries, abuses his inmates, and eventually starts locking up politicians and media members, blaming them for allowing crime to run rampant in the first place, allowing Batman to take him down without any worries.
** When new-vigilante-in-town The Judge shows up later on, attacking the villains and not caring whether or not he kills them, this is never even brought up. It is taken for granted that his actions are wrong, which (given the long, horrible careers of Batman's rogues gallery) seems like it would be open to debate here. The big jump probably comes moments before Batman intervenes, when he is about to kill a small-time corrupt politician who had helped him, but still. The Judge showed how extreme he can really get when he tried to kill Two-Face in his own escape room. As it turns out, [[spoiler: The Judge ''is'' Two-Face, as he is a third persona made by Harvey Dent to fight crime.]]
** Commissioner Gordon in "Over The Edge". After his daughter is killed in a fight with the Scarecrow, he blames Batman and launches a manhunt for him, going as far as to make a deal with Bane. [[spoiler: Fortunately, it was AllJustADream]].
* Also, in ''WesternAnimation/JusticeLeague'', Cadmus. Their stated goals: Provide America (and her allies, probably) a defense against the super powered types, especially the Justice League. What with Superman nearly taking over the world when being brainwashed by Darkseid, the Justice Lords in a parallel universe taking everything over, and the Justice League having an [[DeathFromAbove Orbital Superweapon]] pointing down, this seems entirely okay. Up until the cloning, torture, firing nuclear weapons, being allied with Luthor, creating Doomsday...
** What [[MoralEventHorizon made Cadmus utterly irredeemable]] was finding out that [[spoiler:they were responsible for putting Ace (the youngest member of the Royal Flush Gang) through hell, robbing her of having a halfway normal life and, eventually killing her by overloading her brain to evolve her psychic powers, and triggering a fatal aneurysm in the process. However, she died naturally after Batman went to be with her in her final moments.]]
** There is also the fact they tried to blow up the Watchtower before the League had ever done any harm, and that Gen. Eiling was willing to a nuke an island to "kill three birds with one stone," i.e. kill both Superman and Doomsday and stop the drug smuggling that came through it. Granted, only Eiling was behind this, and Amanda Waller is furious as soon as she finds out about the nuclear air strike.
** And the Justice Lords from a parallel Earth. Superman abandoning ThouShaltNotKill to stop Luthor from starting a nuclear war: justifiable. The entire team doing away with the concept of JokerImmunity altogether and resorting to killing and lobotomizing on a semi-frequent basis: arguable. Setting up a totalitarian state in which elections do not happen until the Justice Lords say they do and people can be arrested for complaining too loudly: seems unnecessary.
** And for that matter, Doctor Destiny's origin story in "[[Recap/{{JusticeLeagueS2E5And6OnlyADream}} Only a Dream]]". At first, he seems to be a fairly decent guy whose big mistake was simply getting hired as a guard by ComicBook/LexLuthor, and the story starts raising questions about WhatMeasureIsAMook and the hypocrisy of the henchmen going to prison and having their lives ruined while the villains themselves keep getting away scott-free. But once he gains superpowers himself, his RoaringRampageOfRevenge throws him right off the slippery slope, and into territory that even Lex never touched, with lemming-like gusto.
* ''WesternAnimation/AvatarTheLastAirbender'':
** Jet's goal it is to protect children like himself orphaned by the war mongering Fire Nation and to fight back. However, it's made pretty clear that Jet has jumped off this slope when he attempts to [[spoiler:drown an entire town uninvolved with the war effort, murder innocent elderly people, and put his own life at risk for the purpose of revenge]]. He notably later attempts to jump back ''on'' the slope, but it [[RedemptionEqualsDeath doesn't turn out too well]].
** It's implied he had already fallen that far long before they met him- the plan was already in place and he had apparently been attacking travelers indiscriminate to their threat-level for a while now. Not to mention his "enforcers" thought nothing of Jet ordering them to kill Sokka. It's not entirely clear whether he truly regretted his actions for being ''morally wrong''.
** This is what leads to [[spoiler:Zuko's eventual HeelFaceTurn. He'd been hesitating for a while, thinking that his family really were good people, despite all the massive evidence otherwise: it's when his father and sister plan to burn an entire country to the ground that he realizes they've jumped off.]]
* ''WesternAnimation/TheLegendOfKorra'':
** Tarrlok starts out as a Jerkass and manipulative self-serving politician. Then he goes completely off the deep end [[spoiler:imposing a curfew on all non-benders and arresting anyone who complains or even has connections with Equalists. He arrests Korra's friends to blackmail her to join him and when she refuses, attacks her and reveals himself to be a bloodbender. By the end of the episode, he's got her locked in the back of a Satomobile to take her somewhere she'll never be found.]]
** Amon and the Equalists start off with a relatively valid complaint: Benders really do have all of the power in Republic City. Up until Episode 10 they had only committed one really extreme crime. Then, they jump full on off the slope by [[spoiler:launching a full-scale invasion of Republic City, complete with ''bombings and gas attacks!'']]. Arguably, their point is also undermined by [[spoiler:the fact that Amon is actually a stupid-powerful Bender himself and uses his own bloodbending ability to destroy others' ability to bend]], but whether that's this trope or simple {{Hypocrisy}} is open for debate.
** Kuvira starts off Book 4 a WellIntentionedExtremist with valid reasons for reuniting the Earth Kingdom under her own rule. She uses some questionable means to persuade cities to side with her, but given the incompetency of the heir to the Earth Kingdom's throne, people didn't fault her for [[spoiler:refusing to reliquish her power to him]] as had been previously agreed, because she seemed much more capable of actually leading. [[spoiler:Attacking the United Republic]] might have been going a little far, but a lot of fans could still sympathize with her point of view, given that it used to be Earth Kingdom territory. Then, when her fiance is [[spoiler:captured and she is offered a deal that will basically allow her to take Bataar Jr. and go home as the uncontested ruler of the Earth Empire if she only agrees to leave the United Republic alone, she decides it would be a better idea to launch an attack with the spirit cannon that will kill her fiance because she believes it will kill Korra as well.]] The show makes a point out of the fact that Bataar Jr. is not okay with sacrificing his life for the cause.
* ''WesternAnimation/KimPossible'':
** Each member of Team Impossible; went from just being a PunchClockHero who [[RemovingTheRival wanted Kim to stop saving the world so they could get paid for doing it themselves]], and basically straight to trying to permenantly end her heroics.
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic:'' Retired Wonderbolt Wind Rider cared more about the preservation of his speed record than about the implications of the FrameUp he set up against Rainbow Dash, thus leading to a BrokenPedestal and, even worse, being stripped of everything that came with being a Wonderbolt.
* ''WesternAnimation/DarkwingDuck'' has this happen with the most likable villain of the show Dr. Bushroot in his origin episode. He starts off by being DrivenToMurder the people who bullied him, made him lose his job ForTheEvulz and mocked him after his mutation. Then he deteriotates morally by seeking revenge against the Dean who cut his funding and then against Darkwing and Launchpad for stopping the attempted murder and by the end he tries to mutate the girl that he liked against her will, so that he could have company. Good Lord!
[[/folder]]

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26th Sep '16 11:33:24 PM Nintendoman01
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* ''Anime/DragonBallSuper'': Zamasu, a Supreme Kai of [[AlternateUniverse Universe 10]], is first introduced as being [[FantasticRacism distrustful of mortals]]. From his introduction, he's SlowlySlippingIntoEvil... and he finally jumps off the slope when he learns of the Super Dragon Balls and the power he could gain from them, which spirals into him breaking into Zuno's temple and outright threatening his life in order to get information about them. From there, rather than simply wait a year for the Super Dragon Balls to be active again, he decides to [[spoiler: kill his master Gowasu and steal his Potaras so he can use his [[TimeTravel Time Ring]], jump ahead a year, wish for immortality, and begin his quest to wipe out all mortals]]. Zamasu freely admits that what he's doing is evil, but it's [[KnightTemplar all to serve a greater good]].



* ''Film/CrimsonTide'' is often noted as quite admirably morally complex for a Jerry Bruckheimer film, with Gene Hackman's character given quite a bit of sympathy in wanting to launch the missiles. At least until the ending, when he makes a thinly veiled racist comment to DenzelWashington, which Washington promptly reverses on him.
* ''Film/TheDarkKnight'', [[spoiler:Harvey Dent]] didn't so much "jump off" as much as [[spoiler:get [[strike:kicked]] [[BreakThemByTalking a little push]] from SelfDemonstrating/TheJoker]].
* ''Film/SweeneyToddTheDemonBarberOfFleetStreet'': Sweeney Todd goes from wanting to just get [[RoaringRampageOfRevenge revenge on two specific people]] to [[SerialKiller randomly murdering]] people off the streets who won't be missed and having them ''[[ImAHumanitarian baked into pies]]'' about halfway through the movie (same thing goes for the [[Theatre/SweeneyToddTheDemonBarberOfFleetStreet stage version]] as well).
* [[ColdSniper Major König]] in ''Film/EnemyAtTheGates'' might be a PunchClockVillain or a WorthyOpponent for most of the movie. He even [[EvenEvilHasStandards shows a veiled contempt]] for brutal goons who beat up prisoners. And then he [[spoiler:hangs a little kid]].
* In ''Film/{{Super}}'', Creator/RainnWilson's character decides to fight crime. This begins with trying to stop drug dealers, but turns into him brutally beating people with a pipe wrench (for cutting in line at the movie theatre).
* A German Film ''Stahlnetz: PSI'' begins with two brothers kidnapping a rich girl [[spoiler: actually she is not...]] for ransom. They reason a girl is a SpoiledBrat anyway and a few days in captivity won't hurt - and for her family, a million is only a pocket money, so it's not really bad. But then the younger brother decides that it is better to leave the girl to die, and [[spoiler: when the other brother objects, beats him up and locks him together with the girl to die]].
* In ''Film/{{Jumper}}'', the Paladins are concerned that the Jumpers will use their powers for selfish gain at the expense of others. In fact, they are right. However, they stop them by straight up murdering all Jumpers they come across and anyone associated with them, turning them into the bad guys. It also doesn't help that they use religious rhetoric to justify their actions, coming off as {{Knight Templar}}s.
* In Film/TheStarChamber, the turning point comes, if not before, when Hardin and the rest go vigilante in order to pursue justice as they see it.
* In ''Film/{{Ghostbusters 1984}}'', EPA agent Walter Peck had a point that the Ghostbusters' operations needed some inspection, especially considering Egon was getting worried about the abnormal amount of spectral energy they are containing in their protection grid. However, he had the wrong attitude as he acted all important and showed his control-freak nature. When Peck later vindictively barges into the business with a court order and imperiously orders the grid shutdown despite the warnings of the Busters and the reservations of the accompanying utility worker, he is shown to be totally unreasonable and completely in the wrong. And he goes beyond his inspecting duties showing how petty his motivations are and how the most important thing for him is throwing his weight around. The fact that Peck then orders the Busters arrested for an explosion he himself clearly was responsible for makes him truly despicable.
* ''Film/XMen'':
** Discussed between the president and Beast in ''Film/XMenTheLastStand'', when they debate weaponizing the cure as a safeguard against dangerous mutants. The president tries to rationalize it as a extreme circumstance, to which Beast responds by pointing out how quickly such a justification can snowball before resigning. The president ends up doing just that when Magneto's mutant army shows up, but by the end he's climbed back up and rehired Beast to help smooth things out again.
** For all its faults, ''Film/XMenOriginsWolverine'''s opening montage of the many wars the US has been in did show Victor's decline from a soldier doing his job to a ruthless killer quite nicely without being really obvious about it.
** ''Film/XMenDaysOfFuturePast'':
*** Young Erik has grown increasingly amoral since his actions in ''First Class''. Mystique isn't far off, either. The two split right before Dallas.
*** Trask Industries' Sentinels originally targeted mutants. But as time passed, their programming came to include regular humans whose offspring would be mutants and eventually, anyone sympathetic to mutants who stood in their way. This ultimately brought about the BadFuture where the worst of humanity lord over the remnants of civilization, using the latest Sentinels to finish off the mutants once and for all.
* ''Film/{{Armored}}'': Mike Cochrane, to the max, as observed by Tyler throughout the course of the plan going awry. Mike finding the opportunity to pull a $42 million heist irresistible to the point he had to pull Tyler in to get the necessary numbers for it was the first sign to Ty that things were going too far. Not abandoning ship (or letting Ty do so) once Baines broke their "nobody gets hurt" promise let Ty know that he couldn't trust Mike. From there, Mike would repeatedly hatch every plan in the book to try to get out with the money anyway as well as kill Ty and [[MauveShirt deputy Jake Echkehart]] [[HeKnowsTooMuch to keep him from talking]]. This winds up [[spoiler:forcing Palmer to kill first Dobbs, then himself, because of their consciences, and gets Quinn and Baines killed when Tyler decides to blow up the money in his car and they get caught in the blast. Finally, the fiasco ends... with Mike's soul so far gone that even with all the money burned and all his conspirators dead, he tries to viciously run over and kill his own godson with the armored truck rather than admit this whole thing went a million degrees wrong.]]
* ''WesternAnimation/MyLittlePonyEquestriaGirlsFriendshipGames'': Human Twilight, after transforming into [[spoiler:Midnight Sparkle]] goes from well meaning but somewhat reckless investigator of magic to [[spoiler: raging she demon that tries ripping apart her own world to get to Equestria so she can study magic.]]
* ''Film/{{Juice}}'': [[spoiler: Bishop was originally just a ChaoticNeutral who was tired of constantly being harassed, who eventually loses it as he kills a store owner, his best friend, and nearly kills one of his other closest friends.]]
[[/folder]]

[[folder:Literature]]
* Oh dear lord Jacen in ''Literature/LegacyOfTheForce''. In the first book he has a vision that the galaxy will fall into chaos and he will end up killing his mentor Luke Skywalker unless he listens to the Villain of the books, and is forced to kill one of his allies who refuses to listen to Jacen's reasoning. Cut to book two when he tortures a prisoner because she knows about a plot to kill his parents and accidentally kills her. Cut then to book three where it is ''he'' who is trying to kill his parents because "My parents are terrorist scum, and that is why I have to show no mercy towards them." This might be a clever showcasing exactly how "Falling to the Dark Side" works - turning the most justifiable cause into ForTheEvulz-ObviouslyEvil.
* In Creator/DamonKnight's short story "The Analogues", a scientist invents a procedure to create a "better conscience" in the form of hallucinations that prevent you from committing crimes. This raises a lot of questions about the morality of removing free choice, but then it turns out the scientist plans to use it to take over the world, and has [[spoiler:already used it on the protagonist to prevent him from stopping the plot]].
* In ''Literature/TheDresdenFiles'', the White Council is extremely strict with their 7 Laws of Wizardry. First violation means an instant beheading unless a wizard on the Council bets their life they can reform the wizard, except in rare cases of self-defense. This is because Black Magic is almost always a slippery slope.
** In ''Changes'', [[spoiler:Harry- after surviving a ''brutal'' TraumaCongaLine- decides that he will do anything to save his daughter, and that the ends justify the means.]] He ends up making a DealWithTheDevil, and personally considers himself evil from that point on. [[spoiler:Once his daughter is safe, he commits suicide, not wanting to live if it means being the Winter Knight.]] But that only makes things worse.
* King Erius in [[{{Nightrunner}} Lynn Flewelling's]] ''Tamir'' trilogy starts by taking the throne from his insane mother, who was executing people left and right, in defiance of the divine edict that for no apparent reason essentially promises Bad Things if a man ever rules the country. Bad Things happen. You could debate whether or not he is really to blame for all that, but then he proceeds to institute sexist practices and start killing off his all female relatives.
* Ho boy, does this ''ever'' happen in the eleventh book of ''Literature/{{Everworld}}'' to [[spoiler: Senna Wales]]. K.A. "{{Ambitio|nIsEvil}}us, intelligent, controlling, VisionaryVillain with a taste for power" into "batshit insane, power-mad, {{Genre Blind|ness}} BadBoss EvilOverlord."
* In ''Literature/MemorySorrowAndThorn'', this trope in a nutshell is the {{backstory}} of the BigBad, the [[TheFairFolk Sitha prince]] Ineluki. Once a purely heroic figure, his ambition and willpower darkened when the Sithi's lands were invaded by savage humans. Dismayed by his people's despair in the face of their approaching doom, he delved into TheseAreThingsManWasNotMeantToKnow and constructed a weapon so terrible that his father the king insisted he destroy it. Maddened by this rejection and by his torments, Ineluki [[SelfMadeOrphan murdered his father]] and took the crown, leading a final, futile resistance against the humans that ended in his death via DangerousForbiddenTechnique. It is deeply unfortunate for the world of Osten Ard that he did not stay dead.
* Rachel from ''Literature/{{Animorphs}}'' spends three years trying not to fall into this as her BloodKnight tendencies slowly but surely turn her into the team's TokenEvilTeammate. She has high points and low points, but generally she manages to keep it together until the events of ''The Return'' and the subsequent unmasking of the Animorphs by the Yeerks. Once she's abandoned the facade of ordinary life entirely what little restraint she had left quickly follows, and one of the last books in the series, ''The Sacrifice'', consists of her mostly just [[KickTheDog kicking one dog after another]]. [[spoiler:Realizing she's fallen into this, she agrees to a suicide mission at the end, knowing she could never fit into normal society again.]]
* ''ASongOfIceAndFire'': Theon was a jerk, but a pretty tame one by the standards of the series. [[spoiler:However after taking over Winterfell and losing his hostages he allows Reek to kill innocent people in a cover up, including two children]].
** He does, however, [[spoiler: start a redemptive arc after being twisted into Ramsay Bolton's "Reek"; at the end of the book, he finally decides to help Jeyne Poole escape the tyranny of the Boltons.]]
[[/folder]]

[[folder:Live Action TV]]
* ''Franchise/StarTrek'' had numerous cases of this. For example, in ''Series/StarTrekVoyager'', it's revealed that after giving the Hirogen holographic technology from ''Voyager'', the Hirogen quickly got bored with the standard holograms and started creating more intelligent holograms to make their hunts better. These holograms eventually became self-aware and rebelled, before freeing others hologram in the area. Even ''Voyager's'' EMH joins their cause, agreeing that this is technically a form of slavery. Unfortunately, they quickly move onto anyone who uses humanoid holograms at all, regardless as to whether those holograms are actually ''sentient''. The Doctor is horrified when their leader brutally murders a man to free the holographic equivalent of ''Clippy''.
* ''Series/TeenWolf'': Lydia references this trope, warning Allison over the phone that Scott might fall off of it, starting with being thirty minutes late for dates and eventually ending up at domestic violence.
* ''Series/XenaWarriorPrincess'' had Najara, a character who either converted or killed criminals. Rather quickly, Najara is revealed to be insane, and can't tell the difference between obvious criminals and lesser offenders.
** See also Calisto, who has a legitimate beef with Xena (Xena killed her family and wiped out her village), but every time she shows up she racks up more collateral damage and DisproportionateRetribution, becoming increasingly less sympathetic in the process.
*** A later episode reveals that Calisto, who has time traveled to the day her parents died, is the one who killed her parents and left her younger self to die. Note that none of this reduces her hate for Xena, showing that she doesn't even care at this point.
* ''Series/{{Supernatural}}'':
** Season 2, "Bloodlust". The Winchester brothers met rogue vampire hunter Gordon Walker while looking for a nest of vampires. Gordon seems like a decent enough chap and a worthy ally, and Dean likes his "kill all the monsters and enjoy the hunt" philosophy. Dean and Sam end up fighting when Sam reveals that other hunters say Gordon is bad news. Before this can go any further, Gordon takes a swandive off the slope when the local vampires turn out to actually be peaceful, having sworn off killing humans, yet he still attempts to slaughter them. Then he tries to feed Sam to the head vampire to prove she's still a monster, and attacks Dean when they try to protect her. Bad move.
** This is Castiel's entire character arc during Season 6. Desperate to defeat Raphael in the civil war in Heaven, Castiel begins performing many morally questionable acts, not the least of which is [[spoiler: allying with Crowley]], and rapidly skipping several shades of grey. This ultimately culminates in the season finale, where he [[spoiler:jumps right into VillainProtagonist territory when he absorbs all the souls of Purgatory and [[AGodAmI declares himself the new God]]]].
** Whilst on a smaller scale, [[spoiler: Castiel's ascension to God and later 'death']] causes Dean to take a much harsher stance on supernatural beings throughout Season 7, most apparent in 'The Girl Next Door'.
* ''Series/{{Angel}}'': During Season 3, Wesley translates a prophecy reading "The Father Will Kill The Son". Not quite sure how to handle the situation, he [[spoiler: takes the baby away - for good - and even strikes Lorne unconscious when he finds out what's going on. To make that even worse, Wesley gets his throat cut and the baby taken away from him. And it was a false prophecy, anyway. Now Holtz has the child and takes him with him into a Hell Dimension, raising him to hate Angel]].
* ''Series/BuffyTheVampireSlayer'':
** In Season 6, Willow goes from [[spoiler: killing Warren]] as revenge for [[spoiler: Tara]] to trying to [[spoiler: kill]] the uninvolved other guys [[spoiler: from the Trio]]. Then to hurting [[spoiler: Buffy, Anya (who initially sympathized with her), and Giles]] and finally to trying to [[spoiler: end the world]]. All within a couple of episodes which together take place within less than one day.
** The Initiative in season four was clearly using questionable methods in their study of demons, vampires, and other paranormal activities, but they were getting the job done and had effectively defanged Spike, one of history's most dangerous vampires. Then they decided that Buffy was a liability and tried to kill her. When it seemed like they were getting back on the slope, they took to torturing Oz (a good werewolf rather than an evil demon) and tried to kill the Slayer again.
** Faith. When she first showed up, she had a lot of problems, not the least of which was that she enjoyed slaying a little too much, but she was definitely a [[AntiHero good guy]]. [[spoiler: Then she accidentally killed a man and the guilt (combined with all the speeches made to her about why she should be feeling guilty) made her snap and go NUTS.]] Later on this happens even more when she gets yelled at for her actions (such as when she tried to kill Angel or saves Buffy and an evil slayer).
** Warren originally created a robot that would obey his every whim, but he eventually abandoned the android because he wanted a girlfriend that would be a partner in the relationship and he fell in love with a woman with her own ideas and personality. His creation of a SexBot and then abandoning it to "die" raises plenty of questions about his character, but he ultimately decides that he wants a woman that he can respect and interact with. In his later appearances in Season 6, he is a misogynistic bastard who tries to brainwash, and eventually kills, his ex-girlfriend because she would not submit to his desires.
* ''Series/{{Battlestar Galactica|2003}}'': Given that ''the entire cast'' has been through hell backwards by the end of the pilot miniseries and it just goes FromBadToWorse after that, this trope is kind of understandable...
** The "Pegasus" arc has been accused of this by some critics, with Admiral Cain taking about twenty minutes to go from merely being a hardassed martinet to ordering the rape of a pregnant woman as a JackBauerInterrogationTechnique and sentencing the crewmen who interfered to summary execution. In fact, the episode "Pegasus" had had to be radically trimmed to fit network time constraints; some of the footage that was lost (and reinstated on the DVD) implied the passing of more time than seems to go by in the episode as aired. The ''Razor'' movie, which came later, also expanded on her backstory; she was already a little unbalanced even before the fall of the Twelve Colonies, at which point something... ''[[DespairEventHorizon broke]]'', thus retconning the events of "Pegasus" into more of a VillainousBreakdown.
** There's also the episode where the woman put in charge of a tribunal takes about 24 hours to go completely nuts with power, and attempt to accuse the commanding officer who appointed her of the crime she's investigating.
** Similarly, in the 'Black Market' episode, the leader of the organisation running it does a pretty good job of defending the need for a BlackMarket in the fleet. Then he talks about having child prostitutes, so [[spoiler: Lee can shoot him without feeling guilty]]
*** Lee did acknowledge the argument about the need for a black market, though, given that he allows it to stay in business afterwards. He just wanted them to clearly understand where the MoralEventHorizon was.
* Seems to happen about once a season in ''Series/DoctorWho''. A few notable examples;
** In ''The Mind of Evil'', a scientist invents a machine that removes criminal impulses from the human mind, and offers it to the government as a means of dealing with dangerous criminals without resorting to the death penalty. Turns out its inventor is actually the Master and the device brainwashes people to serve him.
** In ''Genesis of the Daleks'', Davros invents the Dalek (or "Mark III Travel Machine", as he initially calls it) ostensibly for the purpose of making life easier for mutated Kaleds. When his superiors start getting cold feet about the research, he has the entire Kaled race wiped out.
*** The audio drama ''Davros'', released much later, showed that Davros was already lying in a heap at the bottom of the slope by this point. Not hard, when you're the leading [[MadScientist scientist]] of a race of [[ANaziByAnyOtherName ersatz Nazis]]...
** The original Daleks in "The Daleks" do this too. They're paranoid and threatening, but as the result of a nuclear war with another race that devastated their country and turned them into mutants incapable of surviving outside of travel machines in a specially-built environment with metal floors. While they trick the humans into it, all they really want is anti-radiation drugs which would allow them to leave their suits. It then turns out that their bodies have adapted to need radiation and the withdrawal sends them mad before killing them, so they decide to shoot out a load of radioactive waste onto the planet again when they realise they couldn't survive without radiation.
** In "Rise of the Cybermen", when the British government refuses to fund John Lumic's Cyberman research, he kills the leadership and begins forcibly cyber-converting the British population.
** In "The Unquiet Dead", gaseous beings called [[OurGhostsAreDifferent the Gelth]] need to [[PuppeteerParasite animate human corpses]] to house themselves and hence survive creepy, if not evil. [[GenocideDilemma They ask to come]] to Victorian Cardiff, and the Doctor, dismissing the {{Squick}} of his companions, agrees. After the Gelth come through, however, it turns out [[ILied they lied]] about their numbers and intentions. They want to take over all of Earth's ''living'' bodies but even before we learn this, we can tell that they're malevolent, because shortly after getting the Doctor's go-ahead, they [[GoodColorsEvilColors switch from pale blue to bright red and Satanic]]. Apparently, they were "demonic" all along, see?
** "Partners in Crime" begins with an alien conspiracy that... helps people lose weight effortlessly by giving them pills that cause one pound of fat to turn into an adorable little creature called an Adipose every night. While this comes off as slightly sinister, it's hard to see how they could ever be an enemy- until, of course, the "breeders" of the Adipose decide that their current method is too slow and try to make Adipose out of the entire body of their victims, killing them in the process. Jumping? More like a great, flying leap.
** The Doctor himself jumps from the top of the slope to the bottom in the last 10 or so minutes of "The Waters of Mars". After having spent the whole episode with a group of people destined to die, the Doctor snaps and decides to save them after most of them have already been killed. Just moments after saving the remaining people (in the most epic way possible), the Doctor decides that he can mess with the timeline in any way he sees fit, completely ignoring his species' laws. At this point, the Doctor is almost antagonistic. Thankfully the Doctor is only in this state for one scene, and is brought down a couple of pegs before he can really do anything.
** It's implied in "The Runaway Bride" and more-or-less stated in "Journey's End" that the reason the Doctor travels around with a companion is so that he has someone to remind him not to do this, since he has so much power and gets into such intense and painful situations it would be hard for him not to slip, and hard for anyone to stop him once he starts sliding.
* Holly in ''Series/SlingsAndArrows'' wants to streamline the Festival's business end and replace most of its Creator/WilliamShakespeare with musicals. This is only marks her as a villain in the context of a show where Shakespeare is SeriousBusiness, until she starts abusing her boyfriend and deliberately aggravating the heart problem of a board member who disagrees with her.
* Gerak in season 9 of ''Series/StargateSG1''. At least he got a [[RedemptionEqualsDeath redemptive death]], though.
** The Ori could stray into this. At first it seems that, while their practices are primitive, their ultimate goals are noble enough, helping others to achieve ascension. Then it's revealed that this is all a lie, and the Ori are manipulating people's belief to gain more power.
*** The rogue NID. At first they're stealing alien technology with the purpose of using it to defend earth, making them into {{Knight Templar}}s. Then it turns out they're just in it for the money.
* Similar to the ''Magnum Force'' example, season two of ''Series/MurderOne'' featured a storyline about Clifford Banks, a serial killer who tracked down and executed criminals who escaped justice, or had an unsuitably short prison sentence. He started out on this path through the murder of his retarded brother, he never kills innocent people, and throughout the arc a few people comment that "sometimes the streets need sweeping." Any moral ambiguity is then done away with by the lawyers finding out that Clifford actually killed his brother himself over his frustration about giving up his whole life to care for him, causing a mental breakdown that directed his guilt outwards onto other criminals.
* In the pilot episode of ''Series/TheShield'', Vic Mackey partakes in numerous criminal acts including the use of excessive force during arrests, working with a drug dealer and beating a suspect with a phone book in order to make him talk. Then, at the end of the episode, he [[spoiler:shoots another police officer in the face to prevent him from gathering evidence against Vic's team]].
* An episode of ''Series/TheCommish'' features a VigilanteMan who initially only humiliates bad guys who deserve it. But when an accused rapist/murderer is found not guilty (for good reason), the vigilante (who believes he got OffOnATechnicality) clubs him to death, setting the team on his case.
* The season 8 finale of ''Series/{{Smallville}}'' took an incredible amount of heat for various reasons, and one of them was this trope.
** Season 9 had [[TwoLinesNoWaiting multiple concurrent threads]] of [[WellIntentionedExtremist Well-Intentioned Extremism]] colliding into one big [[SelfFulfillingProphecy Self-Fulfilling prediction of doom]]:
*** Tess Mercer established an alliance with the Kandorians to [[GreenAesop save Earth]] from mankind's destructive ways but in the BadFuture, [[spoiler: she [[LesCollaborateurs collaborated]] fully with Zod's despotic rule over a dying human populace.]]
*** Amanda Waller as the head of Checkmate employed threats, murders, and kidnappings to prepare for a coming [[ApocalypseHow war against the aforementioned Kandorians]]. Then she [[spoiler: casually ordered the execution of a group of [[BroughtDownToNormal non-powered Kandorians]],]] cementing her status as a {{Fantastic Racis|m}}t.
*** General Zod's interest in restoring his and his fellow Kandorians' powers (against Clark's objections) made sense in light of the repeated violent threats they faced from Amanda Waller and other humans ProperlyParanoid about aliens among them. [[spoiler: After Zod and the Kandorians get their powers restored, he destroys Checkmate, kills Faora (and their unborn child) for going against him, and plans to take over Earth with the Kandorians loyal to him and make it into a New Krypton.]]
* Several characters in the 1998 ''{{Series/Merlin|1998}}'' series, but most notably [[MurderTheHypotenuse Uther]] and [[GodSaveUsFromTheQueen Mab]].
* Likewise, in the later ''Series/{{Merlin}}'' BBC series, Morgana was understandably angry and bitter, but nevertheless sympathetic. However, between seasons two and three, she transformed into a smirking villain.
* In one episode of ''Series/{{Monk}}'', when Captain's Stottlemeyer's wife is gravely injured in the fallout of a union assassination, Stottlemeyer proceeds to teeter dangerously close to the edge in his hunt for the sniper. [[spoiler:Near the end, he very nearly launches a raid on the suspected union until Monk manages to crack the case.]]
* ''Series/{{Fringe}}'': Walternate originally just wanted to save his universe, even if it meant destroying a parallel universe and its inhabitants. Then he attempted to [[spoiler: kill his son and the mother of his grandchild.]]
* An episode of ''Series/MacGyver'' involved a business owner attempting to have the Challengers Club shut down because one of its members stole a truck from his printing business. What could have been a two sided conflict between a racist business owner - albeit one who had a legitimate axe to grind - and a teenager conditioned by poverty and racism to view white people as the enemy shifts step by step into a case of the boy being a clear cut victim of The Man. First it turns out the business owner framed the kid for stealing the truck as a pretext to have the Challengers Club shut down. Then he escalates to murdering the club owner. Then it turns out he prints white supremacist propaganda and thinks "niggers should be drowned at birth".
* ''Series/TwentyFour'' does so respectively with Tony Almeida and Jack Bauer in its final two seasons. In Tony's case, [[spoiler: After his wife and unborn son were killed, he sets out to kill the mastermind in any way possible. But tactics he employs in trying to do so include things like murdering the director of the FBI, nearly exposing several innocent people to a lethal pathogen, and attempting to sacrifice Jack in order to get close to his target.]] As for Jack, after years of being tortured, screwed over, and having friends and loved ones taken from him, he finally loses it when [[spoiler: Renee Walker is killed as part of the Russian's cover up and the President betrays him by refusing to reveal the truth since exposing them would also expose their involvement in the murder of a foreign president, which in turn would ruin the chances of a peace treaty she's trying to have signed. Jack claims that he'll take justice into his own hands and expose the truth, but his doing so involves murdering TheMole solely because had been working with the Russians beforehand ''long before'' there was any movement made to kill Renee, slaughtering several members of the Russian government, ''opening fire on a crowd of innocent people'' (which although it was mainly to disable random pedestrian cars, it's still made perfectly clear that Jack could have easily killed someone with even the slightest slip-up and really didn't give a damn at all) and attempting to assassinate both Yuri Survarov and Charles Logan even though killing the both of them would be guaranteed to start a war between the USA and Russia that would likely lead to the deaths of millions.]] The series does its best to make sure that what he's doing isn't in ''any'' sort of heroic light.
* ''Series/{{Charmed}}'' has a twist on this in Season 2's "Morality Bites"; after the sisters use their powers to pull a vengeful yet relatively harmless prank on a man who continually lets his dog defecate on their driveway, Phoebe has a premonition of being burned at the stake for killing someone with her powers a decade in the future. One adventure later, they are sent back to that point in time to prevent falling prey to this trope, worded well by Phoebe:
-->'''Phoebe''': Once you break the small rules, it's just a matter of time before the big ones are next.
* ''{{Series/Hannibal}}'': Will goes from doing some morally ambiguous, but still understandable things, (such as trying to have Hannibal killed) to something unambiguously evil in the episode ''Naka-Choko".
** Of course [[spoiler: it turns out to be a con to convince ''Hannibal'' that he'd gone slope-jumping. And it worked, for a while.]]
* Season 2 of ''Series/AgentsOfSHIELD'' had an interesting ethical dilemma set up between S.H.I.E.L.D., who felt that people with superhuman abilities needed to be indexed and monitored to protect regular people from them in case they ever became dangerous, and the Inhumans, who felt their rights were being taken away and such policies would inevitably lead to wide-scale imprisonment or extermination. Any question of who had the moral high ground went out the window when Jiaying, the Inhumans' leader who had been corrupted by a brutal vivisection at the hands of Dr Whitehall, a member of HYDRA, murdered a S.H.I.E.L.D. representative in cold blood at a peace meeting and framed it to look like S.H.I.E.L.D. was attacking them, then set up a trap to draw as many S.H.I.E.L.D. agents as she could to an aircraft carrier she had hijacked and planned to flood with synthesized Terrigen Mist, which would kill any non-Inhumans who were exposed to it. Her power, previously assumed to be longevity through a HealingFactor, was suddenly revealed to require her to literally drain the life out of other people to sustain herself (granted, she originally hated this power until her vivisection), which she attempts on ''her own daughter'' (who also happens to be an Inhuman) after she [[CallingTheOldManOut calls her out]] on the above plan and tries to stop her.
[[/folder]]

[[folder:Tabletop RPG]]
* ''TabletopGame/VampireTheMasquerade'' has an actual mechanic for this: acting like an inhuman, unprincipled bastard will make you more of an inhuman, unprincipled bastard.
** This applies to all World of Darkness games and is a large part of [[TabletopGame/NewWorldOfDarkness the new system]].
** [[TabletopGame/OldWorldOfDarkness The old system]] is an aversion; the more humanity you lose, the harder it is to lose the next point, the more extreme your behavior has to be. Only if you're determined to destroy your humanity (or your Gamemaster paves your path with {{Sadistic Choice}}s) can you slip past a certain point, but it wouldn't happen by accident.
*** It isn't supposed to be an aversion because as the character's [[KarmaMeter Humanity]] drops, the character's sense of morality does as well. Yes, by the time your Humanity is down to 3, say, it takes doing something truly depraved to drop it any further, but by the time you're down that far, you consider murder to be roughly the equivalent of breaking the speed limit, so there isn't much keeping you from going even farther. However, since in reality a player character's morality is determined by the player, in practice this rarely comes into play.
* Chaos in ''TabletopGame/{{Warhammer 40000}}'' is grease on the Slippery Slope. As Chaos is a sentient form of TheDarkSide by way of TheCorruption, this trope becomes rather understandable.
** The entire theme of the Alpha Legion in 'Legion'. They are a secretive legion who achieve victory through the best means necessary, even if it means the deaths of hundreds of Guardsmen, but are still loyal to the Emperor. However, at the end of the book, they [[spoiler: join the forces of Chaos, believing it's what the Emperor would want.]] Though it is possible they only wanted it to look like they had jumped off the slope so that they could manipulate Horus into losing the war.
** Tau as well, when one considers that its for the greater good for sterilization policies, and special "helmets" for their bug allies.
** The Inquisition contains two major factions: Puritans and Radicals. Puritans are the standard "burn the planet to ashes if there's a hint of Chaos on it" guys, while Radicals are the ones willing to use chaos against itself (i.e., get a guy possessed by a demon so he can use stupidly powerful magic or wield possessed weapons). Strangely, Radicals tend to be ''older'' than Puritans, it's implied seeing a lifetime of fighting against Chaos have so little effect they start using TheDarkSide. Pretty much all of them end up falling to Chaos anyway.
* ''TabletopGame/{{Exalted}}'': Averted. [[DealWithTheDevil Pledging yourself]] as an [[BlackKnight Abyssal]] or [[KnightInSourArmor Infernal Exalt]] might seem like this trope, since it requires pledging loyalty to the [[OmnicidalManiac Deathlords]] or [[AbusivePrecursors Yozis]], respectively. However, it's entirely possible (if not somewhat difficult) to [[TheAtoner go renegade]] and do your own thing, if you decide that being a CardCarryingVillain is for suckers.
** Then there's the demons, dead and [[TheFairFolk raksha]] themselves, who tend to be [[AlwaysChaoticEvil less evil]] and more along the lines of a BlueAndOrangeMorality. Demon summoning is a fairly common practice for everything from construction to medicine to entertainment, some places in Creation have regular interactions with the denizens of the Underworld, and TheFairFolk make great trade partners because of their ability to buy and sell immaterial concepts (like dreams and emotions).
** Played straight with the akuma, who allow themselves to be completely remade as agents of the Yozis in exchange for power. However, given [[DarkAndTroubledPast the circumstances]] that lead many to become akuma, they tend to be a WoobieDestroyerOfWorlds.
[[/folder]]

[[folder:Video Games]]
* ''VideoGame/InjusticeGodsAmongUs'' has a lot of this: Franchise/{{Superman}} doesn't just jump, he flies in the highest speed he can through the slope after being tricked into killing Lois and then killing Joker in retaliation, establishing a totalitarian dictatorship where in exchange of his "protection", everyone that even dares to protest his method get swift death, as exemplified by what happened to that universe's Green Arrow [[spoiler:and later Shazam, and according to the backstory, Hawkman, causing Hawkgirl to retaliate in vengeance, only to be {{Brainwashed}} into servitude]]. He does it a second time when he goes from maintaining order with an iron fist -- and demonstrably creating a peaceful world at the expense of a few lives, and freedom of course -- to flattening cities himself because people don't agree. Via backstory, we see the only surviving ComicBook/TeenTitans being Cyborg and Raven; both end up disillusioned and Raven ends up giving in to Trigon's influence, gaining a lust of torture and becoming Trigon's worshipper instead of trying to prevent his coming. And while Damian Wayne [[spoiler:did accidentally kill Dick Grayson, he didn't look back in regret and goes far worse than before because Superman, being his 'new father figure', got to convince him to stay in the extremist way]]. Meanwhile, Wonder Woman is unquestioningly convinced of Superman's "logic" for some reason, even after it gets clearly to the point of just doing those things he's supposed to be preventing. One man jumping off, the others follow suit in varying level.
* In ''VideoGame/{{BioShock|1}}'', [[spoiler:harvesting more than two of the Little Sisters gives you the bad ending; it is simply implied that you jumped off the slope and became ADAM- and power-hungry the moment you first harvested]].
** Andrew Ryan. The whole point of Rapture was to create a utopia where individuality and free enterprise were unrestrained by the government. Once Fontaine began to rise in power though, paranoia and a fear of losing his city turned him into an ironfisted, totalitarian dictator, [[HeWhoFightsMonsters the exact opposite of what he set out to become]].
** And in ''VideoGame/BioShock2'', if the player jumps off the slope [[spoiler: so does Eleanor.]]
* In ''VideoGame/NeverwinterNights'', Aribeth leaps quite quickly down the slippery slope (partially excused as Morag is messing with her brain and her intentions)
* Subverted in ''VideoGame/RondoOfSwords''. After a very harsh FriendOrIdolDecision that ends up on the favor of the Idol, Serdic experiences an immediate Karmic backlash, complete with [[DarkMessiah title change]], [[DiscardAndDraw power swap]], and [[EvilMakeover costume switch]] to reflect his [[ShootTheDog dog shooting]]. While his Nakama repeatedly [[WhatTheHellHero accuse or suspect him of jumping off the slope]], Serdic experiences no lapse in emotional or moral health. The epilogue also reveals that he was a just and well-loved ruler with a happy marriage.
* CJ and Niko Bellic from ''VideoGame/GrandTheftAutoSanAndreas'' and ''VideoGame/GrandTheftAutoIV'', respectively. Let's assume that they're good-hearted people at the start (if the cut-scenes are any indication), and let's assume the player doesn't do any killing not encouraged by the storyline (which is a stretch, but go with it). Now watch how their lives unfold. CJ in particular goes from "I guess I'll kill this guy since he's been screwing with my gang" to "guess I'll just kill all these guys for no apparent reason" so quickly it might make you wonder if you're still playing as the same guy.
** Well, Niko may seem pretty nice at the beginning of the game, but the plot [[spoiler:eventually reveals that he is a war criminal out to kill other war criminals]]. So there's a good argument that he starts the game as a major bad guy, and indeed committed even more horrible acts before the game started than you can ever do in it.
* ''VideoGame/MegaManX 8'' has [[spoiler:Lumine, a New Generation Reploid, and director of the Orbital Elevator project. ''He's the '''BigBad''''', '''not''' Sigma this time]].
** It doesn't help that the whole of [[spoiler: Lumine]]'s tale plays on the game's subtitle, ''Paradise Lost''. [[spoiler: Lumine is the analogue to Satan, rising against his creators and their vassals. He even seems to have enough truth in his words to shake up X into being completely unable to attack.]]
* It used to be that when the ''VideoGame/{{Warcraft}}'' series needed a new villain, Blizzard would seem to throw a dart at a character board and have the one they hit go insane.
** Kael'thas Sunstrider's goal was originally to improve his suffering people, and despite their re-branding as blood elves, they were a shining example of DarkIsNotEvil. Even when he allied with the [[SnakePeople naga]], and the [[WellIntentionedExtremist partially demonic Illidan]], it was a move of desperation and managed to be the [[OnlySaneMan moral center]] of the group. In Burning Crusade, he's killed as part of Illidan's army, but then he CameBackWrong to reveal he had betrayed him to the Legion and was trying to summon Kil'jaeden so the Burning Legion can destroy Azeroth, killing his own people when they tried to stop him. It's heavily implied that point either the fel magic reanimating him just threw him completely off the slope, or his corpse was just being used by a demon that took on traits of his personality and memory.
** Illidan was always a self-serving JerkAss, but he had a more gentle side to him and never intended his collateral damage. After nearly being killed by Arthas, though, that gentle side was replaced in Burning Crusade with paranoia, insanity and a desire to crush anyone he deems as a threat, which happens to be ''everyone not on his side.'' The jump was severe enough that Blizzard went [[WordOfGod on record]] expressing a desire to bring him back for a proper redemption. He finally returns in ''Legion'' once more a morally ambiguous character whose positive sides are seen in greater light.
** Malygos from ''VideoGame/WorldOfWarcraft'' goes from a dragon who wants to rein in mortal spellcasters because he disapproves of their methods to a dangerously extreme tyrant who seems genuinely unaware that his plan to redirect and control magic has an excellent chance of ''destroying Azeroth''.
** Garrosh Hellscream was always a JerkAss with DaddyIssues, but when Thrall put him in charge of the Horde, he began committing war crime after war crime (eventually addressed in the novel appropriately titled: ''War Crimes''). The most notable jumping point though, was probably using a mana bomb (essentially a nuke, complete with its own analogue for radiation) on Theramore, a city that was founded on and campaigned for peace. Just in case that wasn't enough though, he essentially says to heck with his own people, restores the heart of an EldritchAbomination at the cost of a sacred location, and [[https://www.youtube.com/watch?v=slzQOyS5TqQ declares war on the world]].
** The [[KnightTemplar Scarlet]] [[HeWhoFightsMonsters Crusade]], at least those located within the Scarlet Monastery in Tirisfal Glades can [[FantasticRacism be]] [[WitchHunt accused]] [[ColdBloodedTorture of]] [[KillItWithFire this]]. This in contrast to their forces in the Eastern Plaguelands, who can be sorta excused for their most evil actions due to [[spoiler: their leader being actually a Demon, [[UnwittingPawn who was manipulating them]] to fight the Scourge and [[VanHelsingHateCrimes the sentient undead of the Forsaken]], and then following his {{Villainous Breakdown}} outright [[{{Irony}} kills them all and raises them as undead]].]]
** And, while we're on Warcraft games, as you play the human campaign of Warcraft III, Arthas starts out as a dedicated disciple of Uther Lightbringer (even though Arthas is a prince, Uther's military rank is higher than Arthas's, and they both respect that) but gradually starts getting more and more desperate in his fight against the Undead. Eventually, [[spoiler: he totally betrays Azeroth, dresses in Undead armor, and kills his own father]]. In his case his though, while he had a decline, the [[MoralEventHorizon jumping point]] was the result of taking up a cursed sword that he was too desperate to realize was a trap that stole the soul of ''anyone'' it touched.
* Arcturus Mengsk of ''VideoGame/{{Starcraft}}'' started out as a dashing rebel leader who saved you and Jim Raynor from the Confederacy for killing Zerg. The first time he used a psi emitter to summon the Zerg it was a military target and the rebels helped the majority of civilians flee. Then he dumped several on Tarsonis, a planet with a population of two ''billion'', before attacking the Protoss who came to stop the Zerg, using the orbital defenses to stop anybody from fleeing, and abandoning his second-in-command to the Swarm.
* In ''MitadakeHigh'' it is common for someone to RP themselves going insane as a result of the madness going on around them. Unfortunately, not everyone is any good at it.
* In ''[[VideoGame/FireEmblemTellius Fire Emblem: Path of Radiance]]'', the country of Crimea is good with bits of gray, Daein is dark gray but with evil leaders, and conservative Begnion was in the middle with its corrupt Senate but well-intentioned leaders. When the sequel rolled around and Begnion became be the main antagonist, it became more ruthless.
* ''VideoGame/FinalFantasyVII'' - Sephiroth is initially the best SOLDIER in the world, but after finding out a certain fact about himself, he becomes a murderous psychopath, slaughtering the population of a village and burning it to the ground, and then sets out to destroy the world.
* In ''VideoGame/FinalFantasyXI'' [[spoiler:after the woman that he loved was killed and he was left for dead by Ulrich during the Multinational Expedition to the Northlands, Raogrimm kills Ulrich. Then he hunts down and murders the rest of the people in the Multinational Expedition because they knew that Ulrich had done something and didn't say anything about it. Then he gets a giant "Slip 'N Slide" and whisks down the slope gleefully as he declares war on the human nations and nearly destroys the world. Mind you, some of it may have been the Dark Divinity Odin fanning the flames of his rage, but still... Although, Ulrich's actions during the Multinational Expedition could be considered the ultimate slippery slope, since they were the cause of pretty much all of the major, world-threatening troubles that Vana'Diel has faced in the following 30 years were stemmed from his (accidental) murder of Cornelia.]]
** Subverted in the ''Rise of the Zilart'' expansion as [[spoiler: Kam'lanaut and Eald'narche were always trying to [[TheEndOfTheWorldAsWeKnowIt "open the Gates to Paradise"]].]]
* So many in ''VideoGame/DragonAgeII'', a game where [[GreyAndGrayMorality no one is really evil and no one is truly good]]. By the end of the game, both of the leaders of the two warring factions give into their inner demons with [[spoiler: Meredith, the Knight-Commander of the Templars calling for the execution of all mages in the city of Kirkwall for the actions of just one rogue mage who also jumped off the slippery slope and First Enchanter Orsino, leader of the mages, using BloodMagic in an act of despair.]]
** Both slopes were [[TheDarkSide greased with phlebotinum]] in this case; [[spoiler: Meredith was being corrupted by the lyrium idol in addition to her own paranoia, and the rogue mage was possessed by a demon of Vengeance.]]
** Actually, in the case of [[spoiler:: Orsino he was not possessed by a demon but instead used Blood Magic to turn himself into an abomination of human flesh. The rogue mage was actually Anders, who corrupted a spirit of justice and turned it into of spirit of vengeance, and depending on your interaction with him was either possessed, or willingly blew up the chantry and single-handedly plunged the world into war. Because he willingly allowed the spirit to possess him, its debatable when, and how many times, Anders went off the slope as he is a well-intentioned extremist throughout the game, but before, in Dragon Age: Awakening, there was little, if anything, to hint that he would even become remotely extreme.]]
* Adele in ''VideoGame/ArcRiseFantasia'' jumps right off the slope and onto the [[AxCrazy crazy train]] the ''very instant'' she finds out that she's an [[ChildhoodFriendRomance Unlucky Childhood Friend]], taking this trope to a ''terrifying'' degree.
* The Protagonist from the ''VideoGame/SaintsRow'' series gleefully leaps headfirst off of the slope, and then proceeds to nuke it. In the first game, you start off as a [[HeroicMime (mostly) silent]] henchman who more or less indifferently does what Julius, Gat, Lin, Troy, and others tell you without hesitation, and you seem to be a pretty sane individual. While you are killing, you're killing the other gangs for peace, and the cops you kill are corrupt anyway (of course, not counting civilian casualties in your gameplay rampages). But in Saints Row 2, after being betrayed by Julius and being blown up and disfigured to the point of needing severe plastic surgery ([[GameplayAndStoryIntegration which is really just an excuse to make a new character]]), it's implied that you went insane and very much stated that you're paranoid, corrupt with power, take deep pleasure in murder, is only after the city, and nothing short of evil- the only people outclassing you are [[AssholeVictim the gangs you fight and their leaders]], but not by much. As the game goes on, it becomes clearer and clearer that you're not very interested in wiping out the city for peace anymore as your actions become more and more violent and CrazyAwesome, [[BerserkButton especially after two of your homies get murdered]]. The only person who ever stood a chance of stopping you, your old boss Julius, turns out to have done it because he [[GenreSavvy savilily]] [[TooPowerfulToLive realized that you were a dangerous person]]; you kill him while happily stating you have full intentions of taking over the city in any means necessary.
** Johnny Gat qualifies as well.
** SaintsRowTheThird plays this with most if not all of the main characters, and they each suffer for it. Boss, Gat, Shaundi, Loren, Killbane, Kiki, Temple and Kia are just some of the names who are guilty of this, and all either die or with the exception of Boss can be killed. Boss arguably gets it even worse if s/he chooses to jump off the slippery slope: s/he reverts back to being worse than ever, and a thoroughly despicable person.
* The Illusive Man from the ''Franchise/MassEffect'' trilogy takes a flying leap off the slope in ''VideoGame/MassEffect3''. Whereas before he was a WellIntentionedExtremist who tended toward a lot of ShootTheDog moments in his zeal to protect humanity, in the third game he flies straight off the rails and starts using Reaper technology to assemble a massive army of BrainwashedAndCrazy {{Mooks}}, ordering the murders of civilians, and actively working to undermine the Alliance and the Council in their efforts to defend the galaxy against the Reapers. Eventually, it's revealed that he has completely hurdled the MoralEventHorizon with [[spoiler:Sanctuary, a supposed safe haven for refugees from the Reaper attacks, which turns out to be a laboratory where the refugees are forcibly converted into Husks as part of his research into finding a way to control the Reapers]].
** Explained by the fact that he was [[spoiler:indoctrinated by the Reapers for the entire game.]]
* The ''VideoGame/GodOfWarSeries'': As shown in the [[VideoGame/GodOfWar first game]] and [[VideoGame/GodOfWarAscension its]] [[VideoGame/GodOfWarChainsOfOlympus prequels]], Kratos was always a SociopathicHero at his worst and an AntiHero at his best, but from the [[VideoGame/GodOfWarII second game onwards]], his [[RevengeBeforeReason obsession with revenge]] against the Olympians causes him to devolve into a straight-up VillainProtagonist. In the [[VideoGame/GodOfWarIII third game]], he [[spoiler:indiscriminately kills the gods and essentially brings about TheEndOfTheWorldAsWeKnowIt just for his revenge]].
* ''VideoGame/CallOfDutyAdvancedWarfare'': Irons is a firm believer that HobbesWasRight, and plans [[spoiler: to unite the world under Atlas after toppling the world's governments. After a conventional invasion of the United States fails and the free world unites against him, Irons' next course of action is to hit every military installation in the world with biological weapons that'll kill anyone not registered with Atlas.]]
* In the ''VideoGame/StarTrekOnline: Delta Rising'' mission "All that Glitters", Vaadwaur leader Gaul lures you to a meeting with what sounds like an offer of a peace settlement, with the stipulation that the Kobali release to him the cache of stasis chambers containing Vaadwaur soldiers from the 15th century whom [[DesignatedHero they've been using as reproductive stock]]. Sounds perfectly reasonable at first, but then he says he wants the Alliance to pull a FaceHeelTurn. Upon being informed that the Federation-led alliance wants ''actual'' peace, as in an end to the Supremacy's war of conquest, he loses his shit, starts gunning down Talaxians, and [[NeverMyFault blames you for it]].
* The ''[[Franchise/TheWitcher Witcher]]'' games might as well be called "Radovid of Redania Jumps Off the Slippery Slope". In the [[VideoGame/TheWitcher first game]], he's a pragmatist who seems genuinely horrified by what his allies of convenience got up to. In the [[VideoGame/TheWitcher2AssassinsOfKings second]], he's a ruthless bastard who tortures people and takes every opportunity to expand his domain. In the [[VideoGame/TheWitcher3WildHunt third]], he's a murderous fanatic who even makes [[EvilEmpire Nilfgaard]] look good by comparison. All of this takes place over less than a year of in-universe time.
* ''VideoGame/{{Prototype}}'': In the first game, [[ArmiesAreEvil Blackwatch]] was at least attempting to contain the infection, if in a brutal, violent, and ruthless manner. By the [[VideoGame/{{Prototype 2}} second game]], they've reached the point where they're deliberately kidnapping civilians just so GENTEK scientists can run "experiments" on them involving throwing Infected beasts at them and watching them get shredded. Dialogue from the Blackboxes also further underscores Blackwatch's expanding psychopathy, including a recording of a Blackwatch soldier shooting an autistic boy on the mere suspicion that he was infected, another Blackwatch soldier shooting a woman immediately after warning her he was authorized to use lethal force if she didn't step back, an officer threatening to discharge another Blackwatch trooper for ''saving a woman from being raped'', a recording from Colonel Rooks explicitly stating that it isn't their responsibility to police the refugees even when they start killing each other, and an officer berating a subordinate for shooting an entire family ''because he was wasting ammo''.
* ''{{Franchise/Halo}}'':
** The Ur-Didact, the villain of ''{{VideoGame/Halo 4}}''. In the [[Literature/HaloCryptum first]] [[Literature/HaloPrimordium two]] novels of ''Literature/TheForerunnerSaga'', he starts off as a conflicted general who strongly disliked humanity and believed that the Forerunners were the rightful masters of the galaxy, but nonetheless also grew to respect humans as fellow warriors, and believed that the Forerunners also had a responsibility to protect and preserve even those species who would stand against them (except [[TheVirus the Flood]], obviously), opposing [[GodzillaThreshold the firing of the Halos to stop the Flood]] precisely because it would kill off ''all'' sentient life in the galaxy. And then he gets {{Mind Rape}}ed by the Flood Gravemind, an experience which magnifies his Forerunner supremacism and dislike of humanity into ANaziByAnyOtherName levels. Afterwards, he comes to the conclusion that the only way to defeat the Flood without using the Halos would be to transform his Promethean followers into robotic abominations; when he starts running out of volunteers, he begins forcibly converting humans (making him NotSoDifferent from the Flood), with the intent to eventually wipe out ''all'' humans and any other species who oppose Forerunner rule. The Ur-Didact's transition from tragic hero to [[DarthVaderClone genocidal dictator in skeleton armor]] is covered in ''VideoGame/HaloSilentium'' and the ''Halo 4'' terminals.
** TheReveal of ''VideoGame/Halo5Guardians'' pulls this with [[spoiler:your AI companion Cortana]], who in the [[VideoGame/{{Halo 4}} previous game]] [[spoiler:remained the Chief's friend even as her digital body collapsed and she struggled to remain sane, eventually doing a HeroicSacrifice with the last of her strength]]. In the following game, [[spoiler:she turns out to be alive and supposedly repaired, but now she's at best WellIntentionedExtremist who's going to take over the galaxy with her army of enormous Guardian machines. While she keeps insisting that she has good reasons for doing so]], it's clearly bordering on WouldBeRudeToSayGenocide, especially when [[spoiler:she imprisons Chief and Blue Team in a Cryptum so they won't interfere with her schemes]].
[[/folder]]

[[folder:Webcomics]]
* In ''Webcomic/TheOrderOfTheStick'' paladin Miko Miyazaki starts out as a narrow-minded, HolierThanThou KnightTemplar who the titular Order despise and even her own comrades tend to look for excuses to send her off on missions to distant lands that keep her out of town for long periods. Then she [[spoiler:overhears Lord Shojo talking to Roy and Belkar about their plans to do the dirty work behind the paladins' backs, ignores his [[IDidWhatIHadToDo perfectly good arguments about why he had to do it,]] declares him guilty of treason and executes him on the spot. She's IMMEDIATELY stripped of her powers by the gods for murdering an unarmed octogenarian and goes into a psychotic breakdown when she refuses to accept that she could have been wrong.]]
** [[spoiler:Vaarsuvius]] took a jump, too. See comic [[http://www.giantitp.com/comics/oots0639.html #639]]. Though debates on whether this counts as PayEvilUntoEvil, and whether that stops it being this trope, rage on the forums endlessly.
*** As said by [[spoiler:the fiends]], the best way to get a good person to do horrible things is to convince them that they aren't responsible for their own actions.
* [[spoiler:Wanda]] from ''{{Webcomic/Erfworld}}''. [[spoiler:Ever since she attuned to the Arkenpliers, she has become more and more sadistic and cruel, to the point that, when the team's Foolamancer is injured and unconscious, she says they should ''kill and zombify'' him instead of healing him, simply to save on resources]].
** [[spoiler: It ends up being subverted in that Jack knew something that Parson really needed to know, but Jack was contractually obligated not to tell anyone [[ExactWords for the rest of his life]].]]
* The inspector in ''Chisuji''. First he decided to take justice in his own hands against the criminal who killed his wife and put his daughter in a coma; then he saw the killer's girlfriend holding said daughter's plush toy, and... [[DiscretionShot snapped]].
* Eridan in ''Webcomic/{{Homestuck}}'' was introduced as a ButtMonkey IneffectualSympatheticVillain JerkWithAHeartOfGold, but some of his later appearances have shown that [[spoiler:he pulled a FaceHeelTurn and plans to ally with the BigBad, then proceeds to slaughter his teammates and destroys the one thing that could have saved his people, which he was ''trying to protect''.]]
* ''WebComic/VampireCheerleaders'': At the beginning of the comic, Heather is seemingly sweet and somewhat naive, until she's initiated into the Bakerstown High cheerleading team, where she chose to become a vampire. At that point, she reveals [[BitchInSheepsClothing her true colors]], as her first order of business was to use her newfound powers [[http://www.vampirecheerleaders.net/strips-vc/meet_the_parents_3 to turn on her parents]] and, under [[AlphaBitch Lori's]] instruction, [[http://www.vampirecheerleaders.net/strips-vc/meet_the_parents_8 made them her thralls.]] They spend the remainder of the story [[http://www.vampirecheerleaders.net/strips-vc/money_bags as her mindless slaves.]]
[[/folder]]

[[folder:Western Animation]]
* The ''WesternAnimation/BatmanTheAnimatedSeries'' episode "Lock-Up" introduced Lyle Bolton, ruthless head of security at Arkham Asylum, who eventually goes crazy and becomes the supervillain Lock-Up. He starts off making some good points about his regime bringing Arkham's role as a CardboardPrison to a halt. Fortunately - so to speak - he also turns out to be a sadistic monster who steps way past his boundaries, abuses his inmates, and eventually starts locking up politicians and media members, blaming them for allowing crime to run rampant in the first place, allowing Batman to take him down without any worries.
** When new-vigilante-in-town The Judge shows up later on, attacking the villains and not caring whether or not he kills them, this is never even brought up. It is taken for granted that his actions are wrong, which (given the long, horrible careers of Batman's rogues gallery) seems like it would be open to debate here. The big jump probably comes moments before Batman intervenes, when he is about to kill a small-time corrupt politician who had helped him, but still. The Judge showed how extreme he can really get when he tried to kill Two-Face in his own escape room. As it turns out, [[spoiler: The Judge ''is'' Two-Face, as he is a third persona made by Harvey Dent to fight crime.]]
** Commissioner Gordon in "Over The Edge". After his daughter is killed in a fight with the Scarecrow, he blames Batman and launches a manhunt for him, going as far as to make a deal with Bane. [[spoiler: Fortunately, it was AllJustADream]].
* Also, in ''WesternAnimation/JusticeLeague'', Cadmus. Their stated goals: Provide America (and her allies, probably) a defense against the super powered types, especially the Justice League. What with Superman nearly taking over the world when being brainwashed by Darkseid, the Justice Lords in a parallel universe taking everything over, and the Justice League having an [[DeathFromAbove Orbital Superweapon]] pointing down, this seems entirely okay. Up until the cloning, torture, firing nuclear weapons, being allied with Luthor, creating Doomsday...
** What [[MoralEventHorizon made Cadmus utterly irredeemable]] was finding out that [[spoiler:they were responsible for putting Ace (the youngest member of the Royal Flush Gang) through hell, robbing her of having a halfway normal life and, eventually killing her by overloading her brain to evolve her psychic powers, and triggering a fatal aneurysm in the process. However, she died naturally after Batman went to be with her in her final moments.]]
** There is also the fact they tried to blow up the Watchtower before the League had ever done any harm, and that Gen. Eiling was willing to a nuke an island to "kill three birds with one stone," i.e. kill both Superman and Doomsday and stop the drug smuggling that came through it. Granted, only Eiling was behind this, and Amanda Waller is furious as soon as she finds out about the nuclear air strike.
** And the Justice Lords from a parallel Earth. Superman abandoning ThouShaltNotKill to stop Luthor from starting a nuclear war: justifiable. The entire team doing away with the concept of JokerImmunity altogether and resorting to killing and lobotomizing on a semi-frequent basis: arguable. Setting up a totalitarian state in which elections do not happen until the Justice Lords say they do and people can be arrested for complaining too loudly: seems unnecessary.
** And for that matter, Doctor Destiny's origin story in "[[Recap/{{JusticeLeagueS2E5And6OnlyADream}} Only a Dream]]". At first, he seems to be a fairly decent guy whose big mistake was simply getting hired as a guard by ComicBook/LexLuthor, and the story starts raising questions about WhatMeasureIsAMook and the hypocrisy of the henchmen going to prison and having their lives ruined while the villains themselves keep getting away scott-free. But once he gains superpowers himself, his RoaringRampageOfRevenge throws him right off the slippery slope, and into territory that even Lex never touched, with lemming-like gusto.
* ''WesternAnimation/AvatarTheLastAirbender'':
** Jet's goal it is to protect children like himself orphaned by the war mongering Fire Nation and to fight back. However, it's made pretty clear that Jet has jumped off this slope when he attempts to [[spoiler:drown an entire town uninvolved with the war effort, murder innocent elderly people, and put his own life at risk for the purpose of revenge]]. He notably later attempts to jump back ''on'' the slope, but it [[RedemptionEqualsDeath doesn't turn out too well]].
** It's implied he had already fallen that far long before they met him- the plan was already in place and he had apparently been attacking travelers indiscriminate to their threat-level for a while now. Not to mention his "enforcers" thought nothing of Jet ordering them to kill Sokka. It's not entirely clear whether he truly regretted his actions for being ''morally wrong''.
** This is what leads to [[spoiler:Zuko's eventual HeelFaceTurn. He'd been hesitating for a while, thinking that his family really were good people, despite all the massive evidence otherwise: it's when his father and sister plan to burn an entire country to the ground that he realizes they've jumped off.]]
* ''WesternAnimation/TheLegendOfKorra'':
** Tarrlok starts out as a Jerkass and manipulative self-serving politician. Then he goes completely off the deep end [[spoiler:imposing a curfew on all non-benders and arresting anyone who complains or even has connections with Equalists. He arrests Korra's friends to blackmail her to join him and when she refuses, attacks her and reveals himself to be a bloodbender. By the end of the episode, he's got her locked in the back of a Satomobile to take her somewhere she'll never be found.]]
** Amon and the Equalists start off with a relatively valid complaint: Benders really do have all of the power in Republic City. Up until Episode 10 they had only committed one really extreme crime. Then, they jump full on off the slope by [[spoiler:launching a full-scale invasion of Republic City, complete with ''bombings and gas attacks!'']]. Arguably, their point is also undermined by [[spoiler:the fact that Amon is actually a stupid-powerful Bender himself and uses his own bloodbending ability to destroy others' ability to bend]], but whether that's this trope or simple {{Hypocrisy}} is open for debate.
** Kuvira starts off Book 4 a WellIntentionedExtremist with valid reasons for reuniting the Earth Kingdom under her own rule. She uses some questionable means to persuade cities to side with her, but given the incompetency of the heir to the Earth Kingdom's throne, people didn't fault her for [[spoiler:refusing to reliquish her power to him]] as had been previously agreed, because she seemed much more capable of actually leading. [[spoiler:Attacking the United Republic]] might have been going a little far, but a lot of fans could still sympathize with her point of view, given that it used to be Earth Kingdom territory. Then, when her fiance is [[spoiler:captured and she is offered a deal that will basically allow her to take Bataar Jr. and go home as the uncontested ruler of the Earth Empire if she only agrees to leave the United Republic alone, she decides it would be a better idea to launch an attack with the spirit cannon that will kill her fiance because she believes it will kill Korra as well.]] The show makes a point out of the fact that Bataar Jr. is not okay with sacrificing his life for the cause.
* ''WesternAnimation/KimPossible'':
** Each member of Team Impossible; went from just being a PunchClockHero who [[RemovingTheRival wanted Kim to stop saving the world so they could get paid for doing it themselves]], and basically straight to trying to permenantly end her heroics.
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic:'' Retired Wonderbolt Wind Rider cared more about the preservation of his speed record than about the implications of the FrameUp he set up against Rainbow Dash, thus leading to a BrokenPedestal and, even worse, being stripped of everything that came with being a Wonderbolt.
* ''WesternAnimation/DarkwingDuck'' has this happen with the most likable villain of the show Dr. Bushroot in his origin episode. He starts off by being DrivenToMurder the people who bullied him, made him lose his job ForTheEvulz and mocked him after his mutation. Then he deteriotates morally by seeking revenge against the Dean who cut his funding and then against Darkwing and Launchpad for stopping the attempted murder and by the end he tries to mutate the girl that he liked against her will, so that he could have company. Good Lord!
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* ''Film/CrimsonTide'' is often noted as quite admirably morally complex for a Jerry Bruckheimer film, with Gene Hackman's character given quite a bit of sympathy in wanting to launch the missiles. At least until the ending, when he makes a thinly veiled racist comment to DenzelWashington, which Washington promptly reverses on him.
* ''Film/TheDarkKnight'', [[spoiler:Harvey Dent]] didn't so much "jump off" as much as [[spoiler:get [[strike:kicked]] [[BreakThemByTalking a little push]] from SelfDemonstrating/TheJoker]].
* ''Film/SweeneyToddTheDemonBarberOfFleetStreet'': Sweeney Todd goes from wanting to just get [[RoaringRampageOfRevenge revenge on two specific people]] to [[SerialKiller randomly murdering]] people off the streets who won't be missed and having them ''[[ImAHumanitarian baked into pies]]'' about halfway through the movie (same thing goes for the [[Theatre/SweeneyToddTheDemonBarberOfFleetStreet stage version]] as well).
* [[ColdSniper Major König]] in ''Film/EnemyAtTheGates'' might be a PunchClockVillain or a WorthyOpponent for most of the movie. He even [[EvenEvilHasStandards shows a veiled contempt]] for brutal goons who beat up prisoners. And then he [[spoiler:hangs a little kid]].
* In ''Film/{{Super}}'', Creator/RainnWilson's character decides to fight crime. This begins with trying to stop drug dealers, but turns into him brutally beating people with a pipe wrench (for cutting in line at the movie theatre).
* A German Film ''Stahlnetz: PSI'' begins with two brothers kidnapping a rich girl [[spoiler: actually she is not...]] for ransom. They reason a girl is a SpoiledBrat anyway and a few days in captivity won't hurt - and for her family, a million is only a pocket money, so it's not really bad. But then the younger brother decides that it is better to leave the girl to die, and [[spoiler: when the other brother objects, beats him up and locks him together with the girl to die]].
* In ''Film/{{Jumper}}'', the Paladins are concerned that the Jumpers will use their powers for selfish gain at the expense of others. In fact, they are right. However, they stop them by straight up murdering all Jumpers they come across and anyone associated with them, turning them into the bad guys. It also doesn't help that they use religious rhetoric to justify their actions, coming off as {{Knight Templar}}s.
* In Film/TheStarChamber, the turning point comes, if not before, when Hardin and the rest go vigilante in order to pursue justice as they see it.
* In ''Film/{{Ghostbusters 1984}}'', EPA agent Walter Peck had a point that the Ghostbusters' operations needed some inspection, especially considering Egon was getting worried about the abnormal amount of spectral energy they are containing in their protection grid. However, he had the wrong attitude as he acted all important and showed his control-freak nature. When Peck later vindictively barges into the business with a court order and imperiously orders the grid shutdown despite the warnings of the Busters and the reservations of the accompanying utility worker, he is shown to be totally unreasonable and completely in the wrong. And he goes beyond his inspecting duties showing how petty his motivations are and how the most important thing for him is throwing his weight around. The fact that Peck then orders the Busters arrested for an explosion he himself clearly was responsible for makes him truly despicable.
* ''Film/XMen'':
** Discussed between the president and Beast in ''Film/XMenTheLastStand'', when they debate weaponizing the cure as a safeguard against dangerous mutants. The president tries to rationalize it as a extreme circumstance, to which Beast responds by pointing out how quickly such a justification can snowball before resigning. The president ends up doing just that when Magneto's mutant army shows up, but by the end he's climbed back up and rehired Beast to help smooth things out again.
** For all its faults, ''Film/XMenOriginsWolverine'''s opening montage of the many wars the US has been in did show Victor's decline from a soldier doing his job to a ruthless killer quite nicely without being really obvious about it.
** ''Film/XMenDaysOfFuturePast'':
*** Young Erik has grown increasingly amoral since his actions in ''First Class''. Mystique isn't far off, either. The two split right before Dallas.
*** Trask Industries' Sentinels originally targeted mutants. But as time passed, their programming came to include regular humans whose offspring would be mutants and eventually, anyone sympathetic to mutants who stood in their way. This ultimately brought about the BadFuture where the worst of humanity lord over the remnants of civilization, using the latest Sentinels to finish off the mutants once and for all.
* ''Film/{{Armored}}'': Mike Cochrane, to the max, as observed by Tyler throughout the course of the plan going awry. Mike finding the opportunity to pull a $42 million heist irresistible to the point he had to pull Tyler in to get the necessary numbers for it was the first sign to Ty that things were going too far. Not abandoning ship (or letting Ty do so) once Baines broke their "nobody gets hurt" promise let Ty know that he couldn't trust Mike. From there, Mike would repeatedly hatch every plan in the book to try to get out with the money anyway as well as kill Ty and [[MauveShirt deputy Jake Echkehart]] [[HeKnowsTooMuch to keep him from talking]]. This winds up [[spoiler:forcing Palmer to kill first Dobbs, then himself, because of their consciences, and gets Quinn and Baines killed when Tyler decides to blow up the money in his car and they get caught in the blast. Finally, the fiasco ends... with Mike's soul so far gone that even with all the money burned and all his conspirators dead, he tries to viciously run over and kill his own godson with the armored truck rather than admit this whole thing went a million degrees wrong.]]
* ''WesternAnimation/MyLittlePonyEquestriaGirlsFriendshipGames'': Human Twilight, after transforming into [[spoiler:Midnight Sparkle]] goes from well meaning but somewhat reckless investigator of magic to [[spoiler: raging she demon that tries ripping apart her own world to get to Equestria so she can study magic.]]
* ''Film/{{Juice}}'': [[spoiler: Bishop was originally just a ChaoticNeutral who was tired of constantly being harassed, who eventually loses it as he kills a store owner, his best friend, and nearly kills one of his other closest friends.]]
[[/folder]]

[[folder:Literature]]
* Oh dear lord Jacen in ''Literature/LegacyOfTheForce''. In the first book he has a vision that the galaxy will fall into chaos and he will end up killing his mentor Luke Skywalker unless he listens to the Villain of the books, and is forced to kill one of his allies who refuses to listen to Jacen's reasoning. Cut to book two when he tortures a prisoner because she knows about a plot to kill his parents and accidentally kills her. Cut then to book three where it is ''he'' who is trying to kill his parents because "My parents are terrorist scum, and that is why I have to show no mercy towards them." This might be a clever showcasing exactly how "Falling to the Dark Side" works - turning the most justifiable cause into ForTheEvulz-ObviouslyEvil.
* In Creator/DamonKnight's short story "The Analogues", a scientist invents a procedure to create a "better conscience" in the form of hallucinations that prevent you from committing crimes. This raises a lot of questions about the morality of removing free choice, but then it turns out the scientist plans to use it to take over the world, and has [[spoiler:already used it on the protagonist to prevent him from stopping the plot]].
* In ''Literature/TheDresdenFiles'', the White Council is extremely strict with their 7 Laws of Wizardry. First violation means an instant beheading unless a wizard on the Council bets their life they can reform the wizard, except in rare cases of self-defense. This is because Black Magic is almost always a slippery slope.
** In ''Changes'', [[spoiler:Harry- after surviving a ''brutal'' TraumaCongaLine- decides that he will do anything to save his daughter, and that the ends justify the means.]] He ends up making a DealWithTheDevil, and personally considers himself evil from that point on. [[spoiler:Once his daughter is safe, he commits suicide, not wanting to live if it means being the Winter Knight.]] But that only makes things worse.
* King Erius in [[{{Nightrunner}} Lynn Flewelling's]] ''Tamir'' trilogy starts by taking the throne from his insane mother, who was executing people left and right, in defiance of the divine edict that for no apparent reason essentially promises Bad Things if a man ever rules the country. Bad Things happen. You could debate whether or not he is really to blame for all that, but then he proceeds to institute sexist practices and start killing off his all female relatives.
* Ho boy, does this ''ever'' happen in the eleventh book of ''Literature/{{Everworld}}'' to [[spoiler: Senna Wales]]. K.A. "{{Ambitio|nIsEvil}}us, intelligent, controlling, VisionaryVillain with a taste for power" into "batshit insane, power-mad, {{Genre Blind|ness}} BadBoss EvilOverlord."
* In ''Literature/MemorySorrowAndThorn'', this trope in a nutshell is the {{backstory}} of the BigBad, the [[TheFairFolk Sitha prince]] Ineluki. Once a purely heroic figure, his ambition and willpower darkened when the Sithi's lands were invaded by savage humans. Dismayed by his people's despair in the face of their approaching doom, he delved into TheseAreThingsManWasNotMeantToKnow and constructed a weapon so terrible that his father the king insisted he destroy it. Maddened by this rejection and by his torments, Ineluki [[SelfMadeOrphan murdered his father]] and took the crown, leading a final, futile resistance against the humans that ended in his death via DangerousForbiddenTechnique. It is deeply unfortunate for the world of Osten Ard that he did not stay dead.
* Rachel from ''Literature/{{Animorphs}}'' spends three years trying not to fall into this as her BloodKnight tendencies slowly but surely turn her into the team's TokenEvilTeammate. She has high points and low points, but generally she manages to keep it together until the events of ''The Return'' and the subsequent unmasking of the Animorphs by the Yeerks. Once she's abandoned the facade of ordinary life entirely what little restraint she had left quickly follows, and one of the last books in the series, ''The Sacrifice'', consists of her mostly just [[KickTheDog kicking one dog after another]]. [[spoiler:Realizing she's fallen into this, she agrees to a suicide mission at the end, knowing she could never fit into normal society again.]]
* ''ASongOfIceAndFire'': Theon was a jerk, but a pretty tame one by the standards of the series. [[spoiler:However after taking over Winterfell and losing his hostages he allows Reek to kill innocent people in a cover up, including two children]].
** He does, however, [[spoiler: start a redemptive arc after being twisted into Ramsay Bolton's "Reek"; at the end of the book, he finally decides to help Jeyne Poole escape the tyranny of the Boltons.]]
[[/folder]]

[[folder:Live Action TV]]
* ''Franchise/StarTrek'' had numerous cases of this. For example, in ''Series/StarTrekVoyager'', it's revealed that after giving the Hirogen holographic technology from ''Voyager'', the Hirogen quickly got bored with the standard holograms and started creating more intelligent holograms to make their hunts better. These holograms eventually became self-aware and rebelled, before freeing others hologram in the area. Even ''Voyager's'' EMH joins their cause, agreeing that this is technically a form of slavery. Unfortunately, they quickly move onto anyone who uses humanoid holograms at all, regardless as to whether those holograms are actually ''sentient''. The Doctor is horrified when their leader brutally murders a man to free the holographic equivalent of ''Clippy''.
* ''Series/TeenWolf'': Lydia references this trope, warning Allison over the phone that Scott might fall off of it, starting with being thirty minutes late for dates and eventually ending up at domestic violence.
* ''Series/XenaWarriorPrincess'' had Najara, a character who either converted or killed criminals. Rather quickly, Najara is revealed to be insane, and can't tell the difference between obvious criminals and lesser offenders.
** See also Calisto, who has a legitimate beef with Xena (Xena killed her family and wiped out her village), but every time she shows up she racks up more collateral damage and DisproportionateRetribution, becoming increasingly less sympathetic in the process.
*** A later episode reveals that Calisto, who has time traveled to the day her parents died, is the one who killed her parents and left her younger self to die. Note that none of this reduces her hate for Xena, showing that she doesn't even care at this point.
* ''Series/{{Supernatural}}'':
** Season 2, "Bloodlust". The Winchester brothers met rogue vampire hunter Gordon Walker while looking for a nest of vampires. Gordon seems like a decent enough chap and a worthy ally, and Dean likes his "kill all the monsters and enjoy the hunt" philosophy. Dean and Sam end up fighting when Sam reveals that other hunters say Gordon is bad news. Before this can go any further, Gordon takes a swandive off the slope when the local vampires turn out to actually be peaceful, having sworn off killing humans, yet he still attempts to slaughter them. Then he tries to feed Sam to the head vampire to prove she's still a monster, and attacks Dean when they try to protect her. Bad move.
** This is Castiel's entire character arc during Season 6. Desperate to defeat Raphael in the civil war in Heaven, Castiel begins performing many morally questionable acts, not the least of which is [[spoiler: allying with Crowley]], and rapidly skipping several shades of grey. This ultimately culminates in the season finale, where he [[spoiler:jumps right into VillainProtagonist territory when he absorbs all the souls of Purgatory and [[AGodAmI declares himself the new God]]]].
** Whilst on a smaller scale, [[spoiler: Castiel's ascension to God and later 'death']] causes Dean to take a much harsher stance on supernatural beings throughout Season 7, most apparent in 'The Girl Next Door'.
* ''Series/{{Angel}}'': During Season 3, Wesley translates a prophecy reading "The Father Will Kill The Son". Not quite sure how to handle the situation, he [[spoiler: takes the baby away - for good - and even strikes Lorne unconscious when he finds out what's going on. To make that even worse, Wesley gets his throat cut and the baby taken away from him. And it was a false prophecy, anyway. Now Holtz has the child and takes him with him into a Hell Dimension, raising him to hate Angel]].
* ''Series/BuffyTheVampireSlayer'':
** In Season 6, Willow goes from [[spoiler: killing Warren]] as revenge for [[spoiler: Tara]] to trying to [[spoiler: kill]] the uninvolved other guys [[spoiler: from the Trio]]. Then to hurting [[spoiler: Buffy, Anya (who initially sympathized with her), and Giles]] and finally to trying to [[spoiler: end the world]]. All within a couple of episodes which together take place within less than one day.
** The Initiative in season four was clearly using questionable methods in their study of demons, vampires, and other paranormal activities, but they were getting the job done and had effectively defanged Spike, one of history's most dangerous vampires. Then they decided that Buffy was a liability and tried to kill her. When it seemed like they were getting back on the slope, they took to torturing Oz (a good werewolf rather than an evil demon) and tried to kill the Slayer again.
** Faith. When she first showed up, she had a lot of problems, not the least of which was that she enjoyed slaying a little too much, but she was definitely a [[AntiHero good guy]]. [[spoiler: Then she accidentally killed a man and the guilt (combined with all the speeches made to her about why she should be feeling guilty) made her snap and go NUTS.]] Later on this happens even more when she gets yelled at for her actions (such as when she tried to kill Angel or saves Buffy and an evil slayer).
** Warren originally created a robot that would obey his every whim, but he eventually abandoned the android because he wanted a girlfriend that would be a partner in the relationship and he fell in love with a woman with her own ideas and personality. His creation of a SexBot and then abandoning it to "die" raises plenty of questions about his character, but he ultimately decides that he wants a woman that he can respect and interact with. In his later appearances in Season 6, he is a misogynistic bastard who tries to brainwash, and eventually kills, his ex-girlfriend because she would not submit to his desires.
* ''Series/{{Battlestar Galactica|2003}}'': Given that ''the entire cast'' has been through hell backwards by the end of the pilot miniseries and it just goes FromBadToWorse after that, this trope is kind of understandable...
** The "Pegasus" arc has been accused of this by some critics, with Admiral Cain taking about twenty minutes to go from merely being a hardassed martinet to ordering the rape of a pregnant woman as a JackBauerInterrogationTechnique and sentencing the crewmen who interfered to summary execution. In fact, the episode "Pegasus" had had to be radically trimmed to fit network time constraints; some of the footage that was lost (and reinstated on the DVD) implied the passing of more time than seems to go by in the episode as aired. The ''Razor'' movie, which came later, also expanded on her backstory; she was already a little unbalanced even before the fall of the Twelve Colonies, at which point something... ''[[DespairEventHorizon broke]]'', thus retconning the events of "Pegasus" into more of a VillainousBreakdown.
** There's also the episode where the woman put in charge of a tribunal takes about 24 hours to go completely nuts with power, and attempt to accuse the commanding officer who appointed her of the crime she's investigating.
** Similarly, in the 'Black Market' episode, the leader of the organisation running it does a pretty good job of defending the need for a BlackMarket in the fleet. Then he talks about having child prostitutes, so [[spoiler: Lee can shoot him without feeling guilty]]
*** Lee did acknowledge the argument about the need for a black market, though, given that he allows it to stay in business afterwards. He just wanted them to clearly understand where the MoralEventHorizon was.
* Seems to happen about once a season in ''Series/DoctorWho''. A few notable examples;
** In ''The Mind of Evil'', a scientist invents a machine that removes criminal impulses from the human mind, and offers it to the government as a means of dealing with dangerous criminals without resorting to the death penalty. Turns out its inventor is actually the Master and the device brainwashes people to serve him.
** In ''Genesis of the Daleks'', Davros invents the Dalek (or "Mark III Travel Machine", as he initially calls it) ostensibly for the purpose of making life easier for mutated Kaleds. When his superiors start getting cold feet about the research, he has the entire Kaled race wiped out.
*** The audio drama ''Davros'', released much later, showed that Davros was already lying in a heap at the bottom of the slope by this point. Not hard, when you're the leading [[MadScientist scientist]] of a race of [[ANaziByAnyOtherName ersatz Nazis]]...
** The original Daleks in "The Daleks" do this too. They're paranoid and threatening, but as the result of a nuclear war with another race that devastated their country and turned them into mutants incapable of surviving outside of travel machines in a specially-built environment with metal floors. While they trick the humans into it, all they really want is anti-radiation drugs which would allow them to leave their suits. It then turns out that their bodies have adapted to need radiation and the withdrawal sends them mad before killing them, so they decide to shoot out a load of radioactive waste onto the planet again when they realise they couldn't survive without radiation.
** In "Rise of the Cybermen", when the British government refuses to fund John Lumic's Cyberman research, he kills the leadership and begins forcibly cyber-converting the British population.
** In "The Unquiet Dead", gaseous beings called [[OurGhostsAreDifferent the Gelth]] need to [[PuppeteerParasite animate human corpses]] to house themselves and hence survive creepy, if not evil. [[GenocideDilemma They ask to come]] to Victorian Cardiff, and the Doctor, dismissing the {{Squick}} of his companions, agrees. After the Gelth come through, however, it turns out [[ILied they lied]] about their numbers and intentions. They want to take over all of Earth's ''living'' bodies but even before we learn this, we can tell that they're malevolent, because shortly after getting the Doctor's go-ahead, they [[GoodColorsEvilColors switch from pale blue to bright red and Satanic]]. Apparently, they were "demonic" all along, see?
** "Partners in Crime" begins with an alien conspiracy that... helps people lose weight effortlessly by giving them pills that cause one pound of fat to turn into an adorable little creature called an Adipose every night. While this comes off as slightly sinister, it's hard to see how they could ever be an enemy- until, of course, the "breeders" of the Adipose decide that their current method is too slow and try to make Adipose out of the entire body of their victims, killing them in the process. Jumping? More like a great, flying leap.
** The Doctor himself jumps from the top of the slope to the bottom in the last 10 or so minutes of "The Waters of Mars". After having spent the whole episode with a group of people destined to die, the Doctor snaps and decides to save them after most of them have already been killed. Just moments after saving the remaining people (in the most epic way possible), the Doctor decides that he can mess with the timeline in any way he sees fit, completely ignoring his species' laws. At this point, the Doctor is almost antagonistic. Thankfully the Doctor is only in this state for one scene, and is brought down a couple of pegs before he can really do anything.
** It's implied in "The Runaway Bride" and more-or-less stated in "Journey's End" that the reason the Doctor travels around with a companion is so that he has someone to remind him not to do this, since he has so much power and gets into such intense and painful situations it would be hard for him not to slip, and hard for anyone to stop him once he starts sliding.
* Holly in ''Series/SlingsAndArrows'' wants to streamline the Festival's business end and replace most of its Creator/WilliamShakespeare with musicals. This is only marks her as a villain in the context of a show where Shakespeare is SeriousBusiness, until she starts abusing her boyfriend and deliberately aggravating the heart problem of a board member who disagrees with her.
* Gerak in season 9 of ''Series/StargateSG1''. At least he got a [[RedemptionEqualsDeath redemptive death]], though.
** The Ori could stray into this. At first it seems that, while their practices are primitive, their ultimate goals are noble enough, helping others to achieve ascension. Then it's revealed that this is all a lie, and the Ori are manipulating people's belief to gain more power.
*** The rogue NID. At first they're stealing alien technology with the purpose of using it to defend earth, making them into {{Knight Templar}}s. Then it turns out they're just in it for the money.
* Similar to the ''Magnum Force'' example, season two of ''Series/MurderOne'' featured a storyline about Clifford Banks, a serial killer who tracked down and executed criminals who escaped justice, or had an unsuitably short prison sentence. He started out on this path through the murder of his retarded brother, he never kills innocent people, and throughout the arc a few people comment that "sometimes the streets need sweeping." Any moral ambiguity is then done away with by the lawyers finding out that Clifford actually killed his brother himself over his frustration about giving up his whole life to care for him, causing a mental breakdown that directed his guilt outwards onto other criminals.
* In the pilot episode of ''Series/TheShield'', Vic Mackey partakes in numerous criminal acts including the use of excessive force during arrests, working with a drug dealer and beating a suspect with a phone book in order to make him talk. Then, at the end of the episode, he [[spoiler:shoots another police officer in the face to prevent him from gathering evidence against Vic's team]].
* An episode of ''Series/TheCommish'' features a VigilanteMan who initially only humiliates bad guys who deserve it. But when an accused rapist/murderer is found not guilty (for good reason), the vigilante (who believes he got OffOnATechnicality) clubs him to death, setting the team on his case.
* The season 8 finale of ''Series/{{Smallville}}'' took an incredible amount of heat for various reasons, and one of them was this trope.
** Season 9 had [[TwoLinesNoWaiting multiple concurrent threads]] of [[WellIntentionedExtremist Well-Intentioned Extremism]] colliding into one big [[SelfFulfillingProphecy Self-Fulfilling prediction of doom]]:
*** Tess Mercer established an alliance with the Kandorians to [[GreenAesop save Earth]] from mankind's destructive ways but in the BadFuture, [[spoiler: she [[LesCollaborateurs collaborated]] fully with Zod's despotic rule over a dying human populace.]]
*** Amanda Waller as the head of Checkmate employed threats, murders, and kidnappings to prepare for a coming [[ApocalypseHow war against the aforementioned Kandorians]]. Then she [[spoiler: casually ordered the execution of a group of [[BroughtDownToNormal non-powered Kandorians]],]] cementing her status as a {{Fantastic Racis|m}}t.
*** General Zod's interest in restoring his and his fellow Kandorians' powers (against Clark's objections) made sense in light of the repeated violent threats they faced from Amanda Waller and other humans ProperlyParanoid about aliens among them. [[spoiler: After Zod and the Kandorians get their powers restored, he destroys Checkmate, kills Faora (and their unborn child) for going against him, and plans to take over Earth with the Kandorians loyal to him and make it into a New Krypton.]]
* Several characters in the 1998 ''{{Series/Merlin|1998}}'' series, but most notably [[MurderTheHypotenuse Uther]] and [[GodSaveUsFromTheQueen Mab]].
* Likewise, in the later ''Series/{{Merlin}}'' BBC series, Morgana was understandably angry and bitter, but nevertheless sympathetic. However, between seasons two and three, she transformed into a smirking villain.
* In one episode of ''Series/{{Monk}}'', when Captain's Stottlemeyer's wife is gravely injured in the fallout of a union assassination, Stottlemeyer proceeds to teeter dangerously close to the edge in his hunt for the sniper. [[spoiler:Near the end, he very nearly launches a raid on the suspected union until Monk manages to crack the case.]]
* ''Series/{{Fringe}}'': Walternate originally just wanted to save his universe, even if it meant destroying a parallel universe and its inhabitants. Then he attempted to [[spoiler: kill his son and the mother of his grandchild.]]
* An episode of ''Series/MacGyver'' involved a business owner attempting to have the Challengers Club shut down because one of its members stole a truck from his printing business. What could have been a two sided conflict between a racist business owner - albeit one who had a legitimate axe to grind - and a teenager conditioned by poverty and racism to view white people as the enemy shifts step by step into a case of the boy being a clear cut victim of The Man. First it turns out the business owner framed the kid for stealing the truck as a pretext to have the Challengers Club shut down. Then he escalates to murdering the club owner. Then it turns out he prints white supremacist propaganda and thinks "niggers should be drowned at birth".
* ''Series/TwentyFour'' does so respectively with Tony Almeida and Jack Bauer in its final two seasons. In Tony's case, [[spoiler: After his wife and unborn son were killed, he sets out to kill the mastermind in any way possible. But tactics he employs in trying to do so include things like murdering the director of the FBI, nearly exposing several innocent people to a lethal pathogen, and attempting to sacrifice Jack in order to get close to his target.]] As for Jack, after years of being tortured, screwed over, and having friends and loved ones taken from him, he finally loses it when [[spoiler: Renee Walker is killed as part of the Russian's cover up and the President betrays him by refusing to reveal the truth since exposing them would also expose their involvement in the murder of a foreign president, which in turn would ruin the chances of a peace treaty she's trying to have signed. Jack claims that he'll take justice into his own hands and expose the truth, but his doing so involves murdering TheMole solely because had been working with the Russians beforehand ''long before'' there was any movement made to kill Renee, slaughtering several members of the Russian government, ''opening fire on a crowd of innocent people'' (which although it was mainly to disable random pedestrian cars, it's still made perfectly clear that Jack could have easily killed someone with even the slightest slip-up and really didn't give a damn at all) and attempting to assassinate both Yuri Survarov and Charles Logan even though killing the both of them would be guaranteed to start a war between the USA and Russia that would likely lead to the deaths of millions.]] The series does its best to make sure that what he's doing isn't in ''any'' sort of heroic light.
* ''Series/{{Charmed}}'' has a twist on this in Season 2's "Morality Bites"; after the sisters use their powers to pull a vengeful yet relatively harmless prank on a man who continually lets his dog defecate on their driveway, Phoebe has a premonition of being burned at the stake for killing someone with her powers a decade in the future. One adventure later, they are sent back to that point in time to prevent falling prey to this trope, worded well by Phoebe:
-->'''Phoebe''': Once you break the small rules, it's just a matter of time before the big ones are next.
* ''{{Series/Hannibal}}'': Will goes from doing some morally ambiguous, but still understandable things, (such as trying to have Hannibal killed) to something unambiguously evil in the episode ''Naka-Choko".
** Of course [[spoiler: it turns out to be a con to convince ''Hannibal'' that he'd gone slope-jumping. And it worked, for a while.]]
* Season 2 of ''Series/AgentsOfSHIELD'' had an interesting ethical dilemma set up between S.H.I.E.L.D., who felt that people with superhuman abilities needed to be indexed and monitored to protect regular people from them in case they ever became dangerous, and the Inhumans, who felt their rights were being taken away and such policies would inevitably lead to wide-scale imprisonment or extermination. Any question of who had the moral high ground went out the window when Jiaying, the Inhumans' leader who had been corrupted by a brutal vivisection at the hands of Dr Whitehall, a member of HYDRA, murdered a S.H.I.E.L.D. representative in cold blood at a peace meeting and framed it to look like S.H.I.E.L.D. was attacking them, then set up a trap to draw as many S.H.I.E.L.D. agents as she could to an aircraft carrier she had hijacked and planned to flood with synthesized Terrigen Mist, which would kill any non-Inhumans who were exposed to it. Her power, previously assumed to be longevity through a HealingFactor, was suddenly revealed to require her to literally drain the life out of other people to sustain herself (granted, she originally hated this power until her vivisection), which she attempts on ''her own daughter'' (who also happens to be an Inhuman) after she [[CallingTheOldManOut calls her out]] on the above plan and tries to stop her.
[[/folder]]

[[folder:Tabletop RPG]]
* ''TabletopGame/VampireTheMasquerade'' has an actual mechanic for this: acting like an inhuman, unprincipled bastard will make you more of an inhuman, unprincipled bastard.
** This applies to all World of Darkness games and is a large part of [[TabletopGame/NewWorldOfDarkness the new system]].
** [[TabletopGame/OldWorldOfDarkness The old system]] is an aversion; the more humanity you lose, the harder it is to lose the next point, the more extreme your behavior has to be. Only if you're determined to destroy your humanity (or your Gamemaster paves your path with {{Sadistic Choice}}s) can you slip past a certain point, but it wouldn't happen by accident.
*** It isn't supposed to be an aversion because as the character's [[KarmaMeter Humanity]] drops, the character's sense of morality does as well. Yes, by the time your Humanity is down to 3, say, it takes doing something truly depraved to drop it any further, but by the time you're down that far, you consider murder to be roughly the equivalent of breaking the speed limit, so there isn't much keeping you from going even farther. However, since in reality a player character's morality is determined by the player, in practice this rarely comes into play.
* Chaos in ''TabletopGame/{{Warhammer 40000}}'' is grease on the Slippery Slope. As Chaos is a sentient form of TheDarkSide by way of TheCorruption, this trope becomes rather understandable.
** The entire theme of the Alpha Legion in 'Legion'. They are a secretive legion who achieve victory through the best means necessary, even if it means the deaths of hundreds of Guardsmen, but are still loyal to the Emperor. However, at the end of the book, they [[spoiler: join the forces of Chaos, believing it's what the Emperor would want.]] Though it is possible they only wanted it to look like they had jumped off the slope so that they could manipulate Horus into losing the war.
** Tau as well, when one considers that its for the greater good for sterilization policies, and special "helmets" for their bug allies.
** The Inquisition contains two major factions: Puritans and Radicals. Puritans are the standard "burn the planet to ashes if there's a hint of Chaos on it" guys, while Radicals are the ones willing to use chaos against itself (i.e., get a guy possessed by a demon so he can use stupidly powerful magic or wield possessed weapons). Strangely, Radicals tend to be ''older'' than Puritans, it's implied seeing a lifetime of fighting against Chaos have so little effect they start using TheDarkSide. Pretty much all of them end up falling to Chaos anyway.
* ''TabletopGame/{{Exalted}}'': Averted. [[DealWithTheDevil Pledging yourself]] as an [[BlackKnight Abyssal]] or [[KnightInSourArmor Infernal Exalt]] might seem like this trope, since it requires pledging loyalty to the [[OmnicidalManiac Deathlords]] or [[AbusivePrecursors Yozis]], respectively. However, it's entirely possible (if not somewhat difficult) to [[TheAtoner go renegade]] and do your own thing, if you decide that being a CardCarryingVillain is for suckers.
** Then there's the demons, dead and [[TheFairFolk raksha]] themselves, who tend to be [[AlwaysChaoticEvil less evil]] and more along the lines of a BlueAndOrangeMorality. Demon summoning is a fairly common practice for everything from construction to medicine to entertainment, some places in Creation have regular interactions with the denizens of the Underworld, and TheFairFolk make great trade partners because of their ability to buy and sell immaterial concepts (like dreams and emotions).
** Played straight with the akuma, who allow themselves to be completely remade as agents of the Yozis in exchange for power. However, given [[DarkAndTroubledPast the circumstances]] that lead many to become akuma, they tend to be a WoobieDestroyerOfWorlds.
[[/folder]]

[[folder:Video Games]]
* ''VideoGame/InjusticeGodsAmongUs'' has a lot of this: Franchise/{{Superman}} doesn't just jump, he flies in the highest speed he can through the slope after being tricked into killing Lois and then killing Joker in retaliation, establishing a totalitarian dictatorship where in exchange of his "protection", everyone that even dares to protest his method get swift death, as exemplified by what happened to that universe's Green Arrow [[spoiler:and later Shazam, and according to the backstory, Hawkman, causing Hawkgirl to retaliate in vengeance, only to be {{Brainwashed}} into servitude]]. He does it a second time when he goes from maintaining order with an iron fist -- and demonstrably creating a peaceful world at the expense of a few lives, and freedom of course -- to flattening cities himself because people don't agree. Via backstory, we see the only surviving ComicBook/TeenTitans being Cyborg and Raven; both end up disillusioned and Raven ends up giving in to Trigon's influence, gaining a lust of torture and becoming Trigon's worshipper instead of trying to prevent his coming. And while Damian Wayne [[spoiler:did accidentally kill Dick Grayson, he didn't look back in regret and goes far worse than before because Superman, being his 'new father figure', got to convince him to stay in the extremist way]]. Meanwhile, Wonder Woman is unquestioningly convinced of Superman's "logic" for some reason, even after it gets clearly to the point of just doing those things he's supposed to be preventing. One man jumping off, the others follow suit in varying level.
* In ''VideoGame/{{BioShock|1}}'', [[spoiler:harvesting more than two of the Little Sisters gives you the bad ending; it is simply implied that you jumped off the slope and became ADAM- and power-hungry the moment you first harvested]].
** Andrew Ryan. The whole point of Rapture was to create a utopia where individuality and free enterprise were unrestrained by the government. Once Fontaine began to rise in power though, paranoia and a fear of losing his city turned him into an ironfisted, totalitarian dictator, [[HeWhoFightsMonsters the exact opposite of what he set out to become]].
** And in ''VideoGame/BioShock2'', if the player jumps off the slope [[spoiler: so does Eleanor.]]
* In ''VideoGame/NeverwinterNights'', Aribeth leaps quite quickly down the slippery slope (partially excused as Morag is messing with her brain and her intentions)
* Subverted in ''VideoGame/RondoOfSwords''. After a very harsh FriendOrIdolDecision that ends up on the favor of the Idol, Serdic experiences an immediate Karmic backlash, complete with [[DarkMessiah title change]], [[DiscardAndDraw power swap]], and [[EvilMakeover costume switch]] to reflect his [[ShootTheDog dog shooting]]. While his Nakama repeatedly [[WhatTheHellHero accuse or suspect him of jumping off the slope]], Serdic experiences no lapse in emotional or moral health. The epilogue also reveals that he was a just and well-loved ruler with a happy marriage.
* CJ and Niko Bellic from ''VideoGame/GrandTheftAutoSanAndreas'' and ''VideoGame/GrandTheftAutoIV'', respectively. Let's assume that they're good-hearted people at the start (if the cut-scenes are any indication), and let's assume the player doesn't do any killing not encouraged by the storyline (which is a stretch, but go with it). Now watch how their lives unfold. CJ in particular goes from "I guess I'll kill this guy since he's been screwing with my gang" to "guess I'll just kill all these guys for no apparent reason" so quickly it might make you wonder if you're still playing as the same guy.
** Well, Niko may seem pretty nice at the beginning of the game, but the plot [[spoiler:eventually reveals that he is a war criminal out to kill other war criminals]]. So there's a good argument that he starts the game as a major bad guy, and indeed committed even more horrible acts before the game started than you can ever do in it.
* ''VideoGame/MegaManX 8'' has [[spoiler:Lumine, a New Generation Reploid, and director of the Orbital Elevator project. ''He's the '''BigBad''''', '''not''' Sigma this time]].
** It doesn't help that the whole of [[spoiler: Lumine]]'s tale plays on the game's subtitle, ''Paradise Lost''. [[spoiler: Lumine is the analogue to Satan, rising against his creators and their vassals. He even seems to have enough truth in his words to shake up X into being completely unable to attack.]]
* It used to be that when the ''VideoGame/{{Warcraft}}'' series needed a new villain, Blizzard would seem to throw a dart at a character board and have the one they hit go insane.
** Kael'thas Sunstrider's goal was originally to improve his suffering people, and despite their re-branding as blood elves, they were a shining example of DarkIsNotEvil. Even when he allied with the [[SnakePeople naga]], and the [[WellIntentionedExtremist partially demonic Illidan]], it was a move of desperation and managed to be the [[OnlySaneMan moral center]] of the group. In Burning Crusade, he's killed as part of Illidan's army, but then he CameBackWrong to reveal he had betrayed him to the Legion and was trying to summon Kil'jaeden so the Burning Legion can destroy Azeroth, killing his own people when they tried to stop him. It's heavily implied that point either the fel magic reanimating him just threw him completely off the slope, or his corpse was just being used by a demon that took on traits of his personality and memory.
** Illidan was always a self-serving JerkAss, but he had a more gentle side to him and never intended his collateral damage. After nearly being killed by Arthas, though, that gentle side was replaced in Burning Crusade with paranoia, insanity and a desire to crush anyone he deems as a threat, which happens to be ''everyone not on his side.'' The jump was severe enough that Blizzard went [[WordOfGod on record]] expressing a desire to bring him back for a proper redemption. He finally returns in ''Legion'' once more a morally ambiguous character whose positive sides are seen in greater light.
** Malygos from ''VideoGame/WorldOfWarcraft'' goes from a dragon who wants to rein in mortal spellcasters because he disapproves of their methods to a dangerously extreme tyrant who seems genuinely unaware that his plan to redirect and control magic has an excellent chance of ''destroying Azeroth''.
** Garrosh Hellscream was always a JerkAss with DaddyIssues, but when Thrall put him in charge of the Horde, he began committing war crime after war crime (eventually addressed in the novel appropriately titled: ''War Crimes''). The most notable jumping point though, was probably using a mana bomb (essentially a nuke, complete with its own analogue for radiation) on Theramore, a city that was founded on and campaigned for peace. Just in case that wasn't enough though, he essentially says to heck with his own people, restores the heart of an EldritchAbomination at the cost of a sacred location, and [[https://www.youtube.com/watch?v=slzQOyS5TqQ declares war on the world]].
** The [[KnightTemplar Scarlet]] [[HeWhoFightsMonsters Crusade]], at least those located within the Scarlet Monastery in Tirisfal Glades can [[FantasticRacism be]] [[WitchHunt accused]] [[ColdBloodedTorture of]] [[KillItWithFire this]]. This in contrast to their forces in the Eastern Plaguelands, who can be sorta excused for their most evil actions due to [[spoiler: their leader being actually a Demon, [[UnwittingPawn who was manipulating them]] to fight the Scourge and [[VanHelsingHateCrimes the sentient undead of the Forsaken]], and then following his {{Villainous Breakdown}} outright [[{{Irony}} kills them all and raises them as undead]].]]
** And, while we're on Warcraft games, as you play the human campaign of Warcraft III, Arthas starts out as a dedicated disciple of Uther Lightbringer (even though Arthas is a prince, Uther's military rank is higher than Arthas's, and they both respect that) but gradually starts getting more and more desperate in his fight against the Undead. Eventually, [[spoiler: he totally betrays Azeroth, dresses in Undead armor, and kills his own father]]. In his case his though, while he had a decline, the [[MoralEventHorizon jumping point]] was the result of taking up a cursed sword that he was too desperate to realize was a trap that stole the soul of ''anyone'' it touched.
* Arcturus Mengsk of ''VideoGame/{{Starcraft}}'' started out as a dashing rebel leader who saved you and Jim Raynor from the Confederacy for killing Zerg. The first time he used a psi emitter to summon the Zerg it was a military target and the rebels helped the majority of civilians flee. Then he dumped several on Tarsonis, a planet with a population of two ''billion'', before attacking the Protoss who came to stop the Zerg, using the orbital defenses to stop anybody from fleeing, and abandoning his second-in-command to the Swarm.
* In ''MitadakeHigh'' it is common for someone to RP themselves going insane as a result of the madness going on around them. Unfortunately, not everyone is any good at it.
* In ''[[VideoGame/FireEmblemTellius Fire Emblem: Path of Radiance]]'', the country of Crimea is good with bits of gray, Daein is dark gray but with evil leaders, and conservative Begnion was in the middle with its corrupt Senate but well-intentioned leaders. When the sequel rolled around and Begnion became be the main antagonist, it became more ruthless.
* ''VideoGame/FinalFantasyVII'' - Sephiroth is initially the best SOLDIER in the world, but after finding out a certain fact about himself, he becomes a murderous psychopath, slaughtering the population of a village and burning it to the ground, and then sets out to destroy the world.
* In ''VideoGame/FinalFantasyXI'' [[spoiler:after the woman that he loved was killed and he was left for dead by Ulrich during the Multinational Expedition to the Northlands, Raogrimm kills Ulrich. Then he hunts down and murders the rest of the people in the Multinational Expedition because they knew that Ulrich had done something and didn't say anything about it. Then he gets a giant "Slip 'N Slide" and whisks down the slope gleefully as he declares war on the human nations and nearly destroys the world. Mind you, some of it may have been the Dark Divinity Odin fanning the flames of his rage, but still... Although, Ulrich's actions during the Multinational Expedition could be considered the ultimate slippery slope, since they were the cause of pretty much all of the major, world-threatening troubles that Vana'Diel has faced in the following 30 years were stemmed from his (accidental) murder of Cornelia.]]
** Subverted in the ''Rise of the Zilart'' expansion as [[spoiler: Kam'lanaut and Eald'narche were always trying to [[TheEndOfTheWorldAsWeKnowIt "open the Gates to Paradise"]].]]
* So many in ''VideoGame/DragonAgeII'', a game where [[GreyAndGrayMorality no one is really evil and no one is truly good]]. By the end of the game, both of the leaders of the two warring factions give into their inner demons with [[spoiler: Meredith, the Knight-Commander of the Templars calling for the execution of all mages in the city of Kirkwall for the actions of just one rogue mage who also jumped off the slippery slope and First Enchanter Orsino, leader of the mages, using BloodMagic in an act of despair.]]
** Both slopes were [[TheDarkSide greased with phlebotinum]] in this case; [[spoiler: Meredith was being corrupted by the lyrium idol in addition to her own paranoia, and the rogue mage was possessed by a demon of Vengeance.]]
** Actually, in the case of [[spoiler:: Orsino he was not possessed by a demon but instead used Blood Magic to turn himself into an abomination of human flesh. The rogue mage was actually Anders, who corrupted a spirit of justice and turned it into of spirit of vengeance, and depending on your interaction with him was either possessed, or willingly blew up the chantry and single-handedly plunged the world into war. Because he willingly allowed the spirit to possess him, its debatable when, and how many times, Anders went off the slope as he is a well-intentioned extremist throughout the game, but before, in Dragon Age: Awakening, there was little, if anything, to hint that he would even become remotely extreme.]]
* Adele in ''VideoGame/ArcRiseFantasia'' jumps right off the slope and onto the [[AxCrazy crazy train]] the ''very instant'' she finds out that she's an [[ChildhoodFriendRomance Unlucky Childhood Friend]], taking this trope to a ''terrifying'' degree.
* The Protagonist from the ''VideoGame/SaintsRow'' series gleefully leaps headfirst off of the slope, and then proceeds to nuke it. In the first game, you start off as a [[HeroicMime (mostly) silent]] henchman who more or less indifferently does what Julius, Gat, Lin, Troy, and others tell you without hesitation, and you seem to be a pretty sane individual. While you are killing, you're killing the other gangs for peace, and the cops you kill are corrupt anyway (of course, not counting civilian casualties in your gameplay rampages). But in Saints Row 2, after being betrayed by Julius and being blown up and disfigured to the point of needing severe plastic surgery ([[GameplayAndStoryIntegration which is really just an excuse to make a new character]]), it's implied that you went insane and very much stated that you're paranoid, corrupt with power, take deep pleasure in murder, is only after the city, and nothing short of evil- the only people outclassing you are [[AssholeVictim the gangs you fight and their leaders]], but not by much. As the game goes on, it becomes clearer and clearer that you're not very interested in wiping out the city for peace anymore as your actions become more and more violent and CrazyAwesome, [[BerserkButton especially after two of your homies get murdered]]. The only person who ever stood a chance of stopping you, your old boss Julius, turns out to have done it because he [[GenreSavvy savilily]] [[TooPowerfulToLive realized that you were a dangerous person]]; you kill him while happily stating you have full intentions of taking over the city in any means necessary.
** Johnny Gat qualifies as well.
** SaintsRowTheThird plays this with most if not all of the main characters, and they each suffer for it. Boss, Gat, Shaundi, Loren, Killbane, Kiki, Temple and Kia are just some of the names who are guilty of this, and all either die or with the exception of Boss can be killed. Boss arguably gets it even worse if s/he chooses to jump off the slippery slope: s/he reverts back to being worse than ever, and a thoroughly despicable person.
* The Illusive Man from the ''Franchise/MassEffect'' trilogy takes a flying leap off the slope in ''VideoGame/MassEffect3''. Whereas before he was a WellIntentionedExtremist who tended toward a lot of ShootTheDog moments in his zeal to protect humanity, in the third game he flies straight off the rails and starts using Reaper technology to assemble a massive army of BrainwashedAndCrazy {{Mooks}}, ordering the murders of civilians, and actively working to undermine the Alliance and the Council in their efforts to defend the galaxy against the Reapers. Eventually, it's revealed that he has completely hurdled the MoralEventHorizon with [[spoiler:Sanctuary, a supposed safe haven for refugees from the Reaper attacks, which turns out to be a laboratory where the refugees are forcibly converted into Husks as part of his research into finding a way to control the Reapers]].
** Explained by the fact that he was [[spoiler:indoctrinated by the Reapers for the entire game.]]
* The ''VideoGame/GodOfWarSeries'': As shown in the [[VideoGame/GodOfWar first game]] and [[VideoGame/GodOfWarAscension its]] [[VideoGame/GodOfWarChainsOfOlympus prequels]], Kratos was always a SociopathicHero at his worst and an AntiHero at his best, but from the [[VideoGame/GodOfWarII second game onwards]], his [[RevengeBeforeReason obsession with revenge]] against the Olympians causes him to devolve into a straight-up VillainProtagonist. In the [[VideoGame/GodOfWarIII third game]], he [[spoiler:indiscriminately kills the gods and essentially brings about TheEndOfTheWorldAsWeKnowIt just for his revenge]].
* ''VideoGame/CallOfDutyAdvancedWarfare'': Irons is a firm believer that HobbesWasRight, and plans [[spoiler: to unite the world under Atlas after toppling the world's governments. After a conventional invasion of the United States fails and the free world unites against him, Irons' next course of action is to hit every military installation in the world with biological weapons that'll kill anyone not registered with Atlas.]]
* In the ''VideoGame/StarTrekOnline: Delta Rising'' mission "All that Glitters", Vaadwaur leader Gaul lures you to a meeting with what sounds like an offer of a peace settlement, with the stipulation that the Kobali release to him the cache of stasis chambers containing Vaadwaur soldiers from the 15th century whom [[DesignatedHero they've been using as reproductive stock]]. Sounds perfectly reasonable at first, but then he says he wants the Alliance to pull a FaceHeelTurn. Upon being informed that the Federation-led alliance wants ''actual'' peace, as in an end to the Supremacy's war of conquest, he loses his shit, starts gunning down Talaxians, and [[NeverMyFault blames you for it]].
* The ''[[Franchise/TheWitcher Witcher]]'' games might as well be called "Radovid of Redania Jumps Off the Slippery Slope". In the [[VideoGame/TheWitcher first game]], he's a pragmatist who seems genuinely horrified by what his allies of convenience got up to. In the [[VideoGame/TheWitcher2AssassinsOfKings second]], he's a ruthless bastard who tortures people and takes every opportunity to expand his domain. In the [[VideoGame/TheWitcher3WildHunt third]], he's a murderous fanatic who even makes [[EvilEmpire Nilfgaard]] look good by comparison. All of this takes place over less than a year of in-universe time.
* ''VideoGame/{{Prototype}}'': In the first game, [[ArmiesAreEvil Blackwatch]] was at least attempting to contain the infection, if in a brutal, violent, and ruthless manner. By the [[VideoGame/{{Prototype 2}} second game]], they've reached the point where they're deliberately kidnapping civilians just so GENTEK scientists can run "experiments" on them involving throwing Infected beasts at them and watching them get shredded. Dialogue from the Blackboxes also further underscores Blackwatch's expanding psychopathy, including a recording of a Blackwatch soldier shooting an autistic boy on the mere suspicion that he was infected, another Blackwatch soldier shooting a woman immediately after warning her he was authorized to use lethal force if she didn't step back, an officer threatening to discharge another Blackwatch trooper for ''saving a woman from being raped'', a recording from Colonel Rooks explicitly stating that it isn't their responsibility to police the refugees even when they start killing each other, and an officer berating a subordinate for shooting an entire family ''because he was wasting ammo''.
* ''{{Franchise/Halo}}'':
** The Ur-Didact, the villain of ''{{VideoGame/Halo 4}}''. In the [[Literature/HaloCryptum first]] [[Literature/HaloPrimordium two]] novels of ''Literature/TheForerunnerSaga'', he starts off as a conflicted general who strongly disliked humanity and believed that the Forerunners were the rightful masters of the galaxy, but nonetheless also grew to respect humans as fellow warriors, and believed that the Forerunners also had a responsibility to protect and preserve even those species who would stand against them (except [[TheVirus the Flood]], obviously), opposing [[GodzillaThreshold the firing of the Halos to stop the Flood]] precisely because it would kill off ''all'' sentient life in the galaxy. And then he gets {{Mind Rape}}ed by the Flood Gravemind, an experience which magnifies his Forerunner supremacism and dislike of humanity into ANaziByAnyOtherName levels. Afterwards, he comes to the conclusion that the only way to defeat the Flood without using the Halos would be to transform his Promethean followers into robotic abominations; when he starts running out of volunteers, he begins forcibly converting humans (making him NotSoDifferent from the Flood), with the intent to eventually wipe out ''all'' humans and any other species who oppose Forerunner rule. The Ur-Didact's transition from tragic hero to [[DarthVaderClone genocidal dictator in skeleton armor]] is covered in ''VideoGame/HaloSilentium'' and the ''Halo 4'' terminals.
** TheReveal of ''VideoGame/Halo5Guardians'' pulls this with [[spoiler:your AI companion Cortana]], who in the [[VideoGame/{{Halo 4}} previous game]] [[spoiler:remained the Chief's friend even as her digital body collapsed and she struggled to remain sane, eventually doing a HeroicSacrifice with the last of her strength]]. In the following game, [[spoiler:she turns out to be alive and supposedly repaired, but now she's at best WellIntentionedExtremist who's going to take over the galaxy with her army of enormous Guardian machines. While she keeps insisting that she has good reasons for doing so]], it's clearly bordering on WouldBeRudeToSayGenocide, especially when [[spoiler:she imprisons Chief and Blue Team in a Cryptum so they won't interfere with her schemes]].
[[/folder]]

[[folder:Webcomics]]
* In ''Webcomic/TheOrderOfTheStick'' paladin Miko Miyazaki starts out as a narrow-minded, HolierThanThou KnightTemplar who the titular Order despise and even her own comrades tend to look for excuses to send her off on missions to distant lands that keep her out of town for long periods. Then she [[spoiler:overhears Lord Shojo talking to Roy and Belkar about their plans to do the dirty work behind the paladins' backs, ignores his [[IDidWhatIHadToDo perfectly good arguments about why he had to do it,]] declares him guilty of treason and executes him on the spot. She's IMMEDIATELY stripped of her powers by the gods for murdering an unarmed octogenarian and goes into a psychotic breakdown when she refuses to accept that she could have been wrong.]]
** [[spoiler:Vaarsuvius]] took a jump, too. See comic [[http://www.giantitp.com/comics/oots0639.html #639]]. Though debates on whether this counts as PayEvilUntoEvil, and whether that stops it being this trope, rage on the forums endlessly.
*** As said by [[spoiler:the fiends]], the best way to get a good person to do horrible things is to convince them that they aren't responsible for their own actions.
* [[spoiler:Wanda]] from ''{{Webcomic/Erfworld}}''. [[spoiler:Ever since she attuned to the Arkenpliers, she has become more and more sadistic and cruel, to the point that, when the team's Foolamancer is injured and unconscious, she says they should ''kill and zombify'' him instead of healing him, simply to save on resources]].
** [[spoiler: It ends up being subverted in that Jack knew something that Parson really needed to know, but Jack was contractually obligated not to tell anyone [[ExactWords for the rest of his life]].]]
* The inspector in ''Chisuji''. First he decided to take justice in his own hands against the criminal who killed his wife and put his daughter in a coma; then he saw the killer's girlfriend holding said daughter's plush toy, and... [[DiscretionShot snapped]].
* Eridan in ''Webcomic/{{Homestuck}}'' was introduced as a ButtMonkey IneffectualSympatheticVillain JerkWithAHeartOfGold, but some of his later appearances have shown that [[spoiler:he pulled a FaceHeelTurn and plans to ally with the BigBad, then proceeds to slaughter his teammates and destroys the one thing that could have saved his people, which he was ''trying to protect''.]]
* ''WebComic/VampireCheerleaders'': At the beginning of the comic, Heather is seemingly sweet and somewhat naive, until she's initiated into the Bakerstown High cheerleading team, where she chose to become a vampire. At that point, she reveals [[BitchInSheepsClothing her true colors]], as her first order of business was to use her newfound powers [[http://www.vampirecheerleaders.net/strips-vc/meet_the_parents_3 to turn on her parents]] and, under [[AlphaBitch Lori's]] instruction, [[http://www.vampirecheerleaders.net/strips-vc/meet_the_parents_8 made them her thralls.]] They spend the remainder of the story [[http://www.vampirecheerleaders.net/strips-vc/money_bags as her mindless slaves.]]
[[/folder]]

[[folder:Western Animation]]
* The ''WesternAnimation/BatmanTheAnimatedSeries'' episode "Lock-Up" introduced Lyle Bolton, ruthless head of security at Arkham Asylum, who eventually goes crazy and becomes the supervillain Lock-Up. He starts off making some good points about his regime bringing Arkham's role as a CardboardPrison to a halt. Fortunately - so to speak - he also turns out to be a sadistic monster who steps way past his boundaries, abuses his inmates, and eventually starts locking up politicians and media members, blaming them for allowing crime to run rampant in the first place, allowing Batman to take him down without any worries.
** When new-vigilante-in-town The Judge shows up later on, attacking the villains and not caring whether or not he kills them, this is never even brought up. It is taken for granted that his actions are wrong, which (given the long, horrible careers of Batman's rogues gallery) seems like it would be open to debate here. The big jump probably comes moments before Batman intervenes, when he is about to kill a small-time corrupt politician who had helped him, but still. The Judge showed how extreme he can really get when he tried to kill Two-Face in his own escape room. As it turns out, [[spoiler: The Judge ''is'' Two-Face, as he is a third persona made by Harvey Dent to fight crime.]]
** Commissioner Gordon in "Over The Edge". After his daughter is killed in a fight with the Scarecrow, he blames Batman and launches a manhunt for him, going as far as to make a deal with Bane. [[spoiler: Fortunately, it was AllJustADream]].
* Also, in ''WesternAnimation/JusticeLeague'', Cadmus. Their stated goals: Provide America (and her allies, probably) a defense against the super powered types, especially the Justice League. What with Superman nearly taking over the world when being brainwashed by Darkseid, the Justice Lords in a parallel universe taking everything over, and the Justice League having an [[DeathFromAbove Orbital Superweapon]] pointing down, this seems entirely okay. Up until the cloning, torture, firing nuclear weapons, being allied with Luthor, creating Doomsday...
** What [[MoralEventHorizon made Cadmus utterly irredeemable]] was finding out that [[spoiler:they were responsible for putting Ace (the youngest member of the Royal Flush Gang) through hell, robbing her of having a halfway normal life and, eventually killing her by overloading her brain to evolve her psychic powers, and triggering a fatal aneurysm in the process. However, she died naturally after Batman went to be with her in her final moments.]]
** There is also the fact they tried to blow up the Watchtower before the League had ever done any harm, and that Gen. Eiling was willing to a nuke an island to "kill three birds with one stone," i.e. kill both Superman and Doomsday and stop the drug smuggling that came through it. Granted, only Eiling was behind this, and Amanda Waller is furious as soon as she finds out about the nuclear air strike.
** And the Justice Lords from a parallel Earth. Superman abandoning ThouShaltNotKill to stop Luthor from starting a nuclear war: justifiable. The entire team doing away with the concept of JokerImmunity altogether and resorting to killing and lobotomizing on a semi-frequent basis: arguable. Setting up a totalitarian state in which elections do not happen until the Justice Lords say they do and people can be arrested for complaining too loudly: seems unnecessary.
** And for that matter, Doctor Destiny's origin story in "[[Recap/{{JusticeLeagueS2E5And6OnlyADream}} Only a Dream]]". At first, he seems to be a fairly decent guy whose big mistake was simply getting hired as a guard by ComicBook/LexLuthor, and the story starts raising questions about WhatMeasureIsAMook and the hypocrisy of the henchmen going to prison and having their lives ruined while the villains themselves keep getting away scott-free. But once he gains superpowers himself, his RoaringRampageOfRevenge throws him right off the slippery slope, and into territory that even Lex never touched, with lemming-like gusto.
* ''WesternAnimation/AvatarTheLastAirbender'':
** Jet's goal it is to protect children like himself orphaned by the war mongering Fire Nation and to fight back. However, it's made pretty clear that Jet has jumped off this slope when he attempts to [[spoiler:drown an entire town uninvolved with the war effort, murder innocent elderly people, and put his own life at risk for the purpose of revenge]]. He notably later attempts to jump back ''on'' the slope, but it [[RedemptionEqualsDeath doesn't turn out too well]].
** It's implied he had already fallen that far long before they met him- the plan was already in place and he had apparently been attacking travelers indiscriminate to their threat-level for a while now. Not to mention his "enforcers" thought nothing of Jet ordering them to kill Sokka. It's not entirely clear whether he truly regretted his actions for being ''morally wrong''.
** This is what leads to [[spoiler:Zuko's eventual HeelFaceTurn. He'd been hesitating for a while, thinking that his family really were good people, despite all the massive evidence otherwise: it's when his father and sister plan to burn an entire country to the ground that he realizes they've jumped off.]]
* ''WesternAnimation/TheLegendOfKorra'':
** Tarrlok starts out as a Jerkass and manipulative self-serving politician. Then he goes completely off the deep end [[spoiler:imposing a curfew on all non-benders and arresting anyone who complains or even has connections with Equalists. He arrests Korra's friends to blackmail her to join him and when she refuses, attacks her and reveals himself to be a bloodbender. By the end of the episode, he's got her locked in the back of a Satomobile to take her somewhere she'll never be found.]]
** Amon and the Equalists start off with a relatively valid complaint: Benders really do have all of the power in Republic City. Up until Episode 10 they had only committed one really extreme crime. Then, they jump full on off the slope by [[spoiler:launching a full-scale invasion of Republic City, complete with ''bombings and gas attacks!'']]. Arguably, their point is also undermined by [[spoiler:the fact that Amon is actually a stupid-powerful Bender himself and uses his own bloodbending ability to destroy others' ability to bend]], but whether that's this trope or simple {{Hypocrisy}} is open for debate.
** Kuvira starts off Book 4 a WellIntentionedExtremist with valid reasons for reuniting the Earth Kingdom under her own rule. She uses some questionable means to persuade cities to side with her, but given the incompetency of the heir to the Earth Kingdom's throne, people didn't fault her for [[spoiler:refusing to reliquish her power to him]] as had been previously agreed, because she seemed much more capable of actually leading. [[spoiler:Attacking the United Republic]] might have been going a little far, but a lot of fans could still sympathize with her point of view, given that it used to be Earth Kingdom territory. Then, when her fiance is [[spoiler:captured and she is offered a deal that will basically allow her to take Bataar Jr. and go home as the uncontested ruler of the Earth Empire if she only agrees to leave the United Republic alone, she decides it would be a better idea to launch an attack with the spirit cannon that will kill her fiance because she believes it will kill Korra as well.]] The show makes a point out of the fact that Bataar Jr. is not okay with sacrificing his life for the cause.
* ''WesternAnimation/KimPossible'':
** Each member of Team Impossible; went from just being a PunchClockHero who [[RemovingTheRival wanted Kim to stop saving the world so they could get paid for doing it themselves]], and basically straight to trying to permenantly end her heroics.
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic:'' Retired Wonderbolt Wind Rider cared more about the preservation of his speed record than about the implications of the FrameUp he set up against Rainbow Dash, thus leading to a BrokenPedestal and, even worse, being stripped of everything that came with being a Wonderbolt.
* ''WesternAnimation/DarkwingDuck'' has this happen with the most likable villain of the show Dr. Bushroot in his origin episode. He starts off by being DrivenToMurder the people who bullied him, made him lose his job ForTheEvulz and mocked him after his mutation. Then he deteriotates morally by seeking revenge against the Dean who cut his funding and then against Darkwing and Launchpad for stopping the attempted murder and by the end he tries to mutate the girl that he liked against her will, so that he could have company. Good Lord!
[[/folder]]

----
l
26th Sep '16 7:42:12 PM SickBoy
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26th Sep '16 7:36:08 PM SickBoy
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* In ''Film/{{Super}}'', Creator/RainnWilson's character decides to fight crime. This begins with trying to stop drug dealers, but turns into him brutally beating people with a monkey wrench (for cutting in line at the movie theatre).

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* In ''Film/{{Super}}'', Creator/RainnWilson's character decides to fight crime. This begins with trying to stop drug dealers, but turns into him brutally beating people with a monkey pipe wrench (for cutting in line at the movie theatre).
7th Sep '16 12:52:39 PM N8han11
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* In ''Anime/MobileSuitGundam00'', the Trinity group shows up and starts actually destroying military bases and arms manufacturers. Most of the battles up until this point had hundreds of civilian casualties, with one battle threatening to basically screw the entire world with nuclear radiation. Through destroying military installations instead of waiting for war to start, Trinity is preventing these needless deaths. However, the "it's not right to attack before you're attacked" excuse is played, Trinity is painted as villainous when it's actually clearly good... and it suddenly starts blowing up random buildings for no reason. Let's also point out that the villains out to cause perpetual war for personal profit are never portrayed in nearly such a negative light.
** While Trinity's actions may have been jumping of the slippery slope they were hardly 'clearly good' in the first place- Gundam 00 is full of GreyAndGrayMorality and the point is that no one side is clearly good or clearly evil. The Trinity's actions were simply causing more needless deaths by murdering civilians in arms factories and blowing up military bases which weren't attacking anyone, simply defending their homeland. Trinity's actions are a classic example of jumping of the slippery slope by quickly resorting to overly extreme methods, and are hardly unambiguously good ones being wrongly portrayed as evil.
*** It's the difference between shooting the gun out of someone's hands and shooting their hands off so they can't wield a gun in the first place.

to:

* In ''Anime/MobileSuitGundam00'', the Trinity group shows up and starts actually destroying military bases and arms manufacturers. Most of the battles up until this point had hundreds of civilian casualties, with one battle threatening to basically screw the entire world with nuclear radiation. Through destroying military installations instead of waiting for war to start, Trinity is preventing these needless deaths. However, the "it's not right to attack before you're attacked" excuse is played, Trinity is painted as villainous when it's actually clearly good... and it suddenly starts blowing up random buildings for no reason. Let's also point out that the villains out to cause perpetual war for personal profit are never portrayed in nearly such a negative light.
** While Trinity's actions may have been jumping of the slippery slope they were hardly 'clearly good' in the first place- Gundam 00 is full of GreyAndGrayMorality and the point is that no one side is clearly good or clearly evil. The Trinity's actions were simply causing more needless deaths by murdering civilians in arms factories and blowing up military bases which weren't attacking anyone, simply defending their homeland. Trinity's actions are a classic example of jumping of the slippery slope by quickly resorting to overly extreme methods, and are hardly unambiguously good ones being wrongly portrayed as evil.
*** It's the difference between shooting the gun out of someone's hands and shooting their hands off so they can't wield a gun in the first place.
*''Anime/MobileSuitGundam00'':



*** Yet it must be pointed out that Gundam 00 was heavy on the AllThereInTheManual aspect and the side documents explained that the Trinities resorting to extreme measures and having sociopathic natures were not of their own intentions, but rather [[RaisedByWolves as a result of their development]]. (Nena, the one who attacked said wedding, [[ConvenientComa was kept in stasis from her birth to her tenth birthday]] and thus [[PsychopathicManchild has always the mentality of a little girl]]) Because their role was to make Celestial Being look bad, and then die immediately aftewords, their resorting to harsh measures was simply to cause a public relations nightmare with the group, and to ensure that Celestial Being would not bother helping the Trinity siblings in their hour of need (Setsuna did not intentionally save Nena, but rather was attempting to stop Ali al-Saachez from using a Gundam, especially since they used the Trinities' fight for survival as battle strategy for opponents). That's FridgeHorror in a nutshell.

to:

*** Yet it must be pointed out that Gundam 00 was heavy on the AllThereInTheManual aspect and the side documents explained that the Trinities resorting to extreme measures and having sociopathic natures were not of their own intentions, but rather [[RaisedByWolves as a result of their development]]. (Nena, the one who attacked said wedding, [[ConvenientComa was kept in stasis from her birth to her tenth birthday]] and thus [[PsychopathicManchild has always the mentality of a little girl]]) Because their role was to make Celestial Being look bad, and then die immediately aftewords, their resorting to harsh measures was simply to cause a public relations nightmare with the group, and to ensure that Celestial Being would not bother helping the Trinity siblings in their hour of need (Setsuna did not intentionally save Nena, but rather was attempting to stop Ali al-Saachez from using a Gundam, especially since they used the Trinities' fight for survival as battle strategy for opponents). That's FridgeHorror in a nutshell.
7th Sep '16 6:19:28 AM Shadowgazer
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* In ''Film/{{Ghostbusters 1984}}'', EPA agent Walter Peck had a point that the Ghostbusters' operations needed some inspection, especially considering Egon was getting worried about the abnormal amount of spectral energy they are containing in their protection grid. However, when Peck later vindictively barges into the business with a court order and imperiously orders the grid shutdown despite the warnings of the Busters and the reservations of the accompanying utility worker, he is shown to be totally unreasonable and completely in the wrong. The fact that Peck then orders the Busters arrested for an explosion he himself clearly was responsible for makes him truly despicable.

to:

* In ''Film/{{Ghostbusters 1984}}'', EPA agent Walter Peck had a point that the Ghostbusters' operations needed some inspection, especially considering Egon was getting worried about the abnormal amount of spectral energy they are containing in their protection grid. However, when he had the wrong attitude as he acted all important and showed his control-freak nature. When Peck later vindictively barges into the business with a court order and imperiously orders the grid shutdown despite the warnings of the Busters and the reservations of the accompanying utility worker, he is shown to be totally unreasonable and completely in the wrong.wrong. And he goes beyond his inspecting duties showing how petty his motivations are and how the most important thing for him is throwing his weight around. The fact that Peck then orders the Busters arrested for an explosion he himself clearly was responsible for makes him truly despicable.



* ''WesternAnimation/DarkwingDuck'' has this happen with the most likable villain of the show Dr. Bushroot in his origin episode. He starts off by being DrivenToMurder the people who bullied him, made him lose his job ForTheEvulz and mocked him after his mutation. Then he deteriotates morally by seeking revenge against the Dean who cut his funding and Darkwing and Launchpad for stopping that one and by the end he tries to mutate the girl that he liked against her will, so he could have company. Good Lord!

to:

* ''WesternAnimation/DarkwingDuck'' has this happen with the most likable villain of the show Dr. Bushroot in his origin episode. He starts off by being DrivenToMurder the people who bullied him, made him lose his job ForTheEvulz and mocked him after his mutation. Then he deteriotates morally by seeking revenge against the Dean who cut his funding and then against Darkwing and Launchpad for stopping that one the attempted murder and by the end he tries to mutate the girl that he liked against her will, so that he could have company. Good Lord!
4th Sep '16 5:19:10 PM Prometheus117
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** Kael'thas Sunstrider's goal was originally to improve his suffering people, and despite their re-branding as blood elves, they were a shining example of DarkIsNotEvil. Even when he allied with the [[SnakePeople naga]], and the [[WellIntentionedExtremist partially demonic Illidan]], it was a move of desperation and managed to be the [[OnlySaneMan moral center]] of the group. In Burning Crusade, he's killed as part of Illidan's army, but then returns to reveal he had betrayed him to the Legion and was trying to summon Kil'jaeden so the Burning Legion can destroy Azeroth, killing his own people when they tried to stop him. [[FlatWhat What.]]
** Illidan was always a self-serving JerkAss, but he had a more gentle side to him and never intended his collateral damage. After nearly being killed by Arthas, though, that gentle side was replaced in Burning Crusade with paranoia, insanity and a desire to crush anyone he deems as a threat, which happens to be ''everyone not on his side.'' The jump was severe enough that Blizzard went [[WordOfGod on record]] expressing a desire to bring him back for a proper redemption. He finally returns in World of Warcraft: Legion.

to:

** Kael'thas Sunstrider's goal was originally to improve his suffering people, and despite their re-branding as blood elves, they were a shining example of DarkIsNotEvil. Even when he allied with the [[SnakePeople naga]], and the [[WellIntentionedExtremist partially demonic Illidan]], it was a move of desperation and managed to be the [[OnlySaneMan moral center]] of the group. In Burning Crusade, he's killed as part of Illidan's army, but then returns he CameBackWrong to reveal he had betrayed him to the Legion and was trying to summon Kil'jaeden so the Burning Legion can destroy Azeroth, killing his own people when they tried to stop him. [[FlatWhat What.]]
It's heavily implied that point either the fel magic reanimating him just threw him completely off the slope, or his corpse was just being used by a demon that took on traits of his personality and memory.
** Illidan was always a self-serving JerkAss, but he had a more gentle side to him and never intended his collateral damage. After nearly being killed by Arthas, though, that gentle side was replaced in Burning Crusade with paranoia, insanity and a desire to crush anyone he deems as a threat, which happens to be ''everyone not on his side.'' The jump was severe enough that Blizzard went [[WordOfGod on record]] expressing a desire to bring him back for a proper redemption. He finally returns in World of Warcraft: Legion.''Legion'' once more a morally ambiguous character whose positive sides are seen in greater light.
7th Aug '16 10:25:14 AM UmbrellasWereAwesome
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** The Didact, the villain of ''{{VideoGame/Halo 4}}'', comes off as this if one is familiar with the ExpandedUniverse. In the terminals of ''{{VideoGame/Halo 3}}'' and ''Literature/TheForerunnerSaga'', he was depicted as a conflicted general who ended up causing [[EldritchAbomination the Flood]] to conquer more of his civilization because he couldn't bear to [[GodzillaThreshold fire the Halos]] and wipe out all life in the galaxy to kill the parasite. In ''Halo 4'', he apparently didn't want to fire the Halos because he was racist and didn't want those pesky humans taking over the galaxy after the Halos would make some living room. So from tragic hero to [[DarthVaderClone genocidal dictator in skeleton armor]].
** TheReveal of ''VideoGame/Halo5Guardians'' pulls this with [[spoiler:your AI companion Cortana]], who in the previous game [[spoiler:remained the Chief's friend even as her digital body collapsed and she struggled to remain sane, eventually doing a HeroicSacrifice with the last of her strength]]. In the following game, [[spoiler:she turns to be alive and supposedly repaired, but now she's an OmnicidalManiac who's going to take over the galaxy with her army of enormous Guardian droids. While she keeps insisting that she has good reasons for doing so]], it's clearly just pushing WouldBeRudeToSayGenocide, especially when [[spoiler:she imprisons Chief and Blue Team in a Cryptum so he won't interfere with her scheme.]]

to:

** The Didact, Ur-Didact, the villain of ''{{VideoGame/Halo 4}}'', comes off as this if one is familiar with the ExpandedUniverse. 4}}''. In the terminals [[Literature/HaloCryptum first]] [[Literature/HaloPrimordium two]] novels of ''{{VideoGame/Halo 3}}'' and ''Literature/TheForerunnerSaga'', he was depicted starts off as a conflicted general who ended up causing [[EldritchAbomination strongly disliked humanity and believed that the Flood]] Forerunners were the rightful masters of the galaxy, but nonetheless also grew to conquer more of his civilization because he couldn't bear respect humans as fellow warriors, and believed that the Forerunners also had a responsibility to protect and preserve even those species who would stand against them (except [[TheVirus the Flood]], obviously), opposing [[GodzillaThreshold fire the Halos]] and wipe out all firing of the Halos to stop the Flood]] precisely because it would kill off ''all'' sentient life in the galaxy to kill galaxy. And then he gets {{Mind Rape}}ed by the parasite. In ''Halo 4'', Flood Gravemind, an experience which magnifies his Forerunner supremacism and dislike of humanity into ANaziByAnyOtherName levels. Afterwards, he apparently didn't want comes to fire the Halos because he was racist and didn't want those pesky humans taking over conclusion that the galaxy after only way to defeat the Flood without using the Halos would make some living room. So be to transform his Promethean followers into robotic abominations; when he starts running out of volunteers, he begins forcibly converting humans (making him NotSoDifferent from the Flood), with the intent to eventually wipe out ''all'' humans and any other species who oppose Forerunner rule. The Ur-Didact's transition from tragic hero to [[DarthVaderClone genocidal dictator in skeleton armor]].
armor]] is covered in ''VideoGame/HaloSilentium'' and the ''Halo 4'' terminals.
** TheReveal of ''VideoGame/Halo5Guardians'' pulls this with [[spoiler:your AI companion Cortana]], who in the [[VideoGame/{{Halo 4}} previous game game]] [[spoiler:remained the Chief's friend even as her digital body collapsed and she struggled to remain sane, eventually doing a HeroicSacrifice with the last of her strength]]. In the following game, [[spoiler:she turns out to be alive and supposedly repaired, but now she's an OmnicidalManiac at best WellIntentionedExtremist who's going to take over the galaxy with her army of enormous Guardian droids. machines. While she keeps insisting that she has good reasons for doing so]], it's clearly just pushing bordering on WouldBeRudeToSayGenocide, especially when [[spoiler:she imprisons Chief and Blue Team in a Cryptum so he they won't interfere with her scheme.]]schemes]].
1st Aug '16 5:43:51 AM Shadowgazer
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** Light Yagami begins using the supernatural notebook to rid society of criminals, but soon his black list expands to include anyone who stands in his way for any reason, starting with Lind L. Taylor, [[spoiler:a patsy used by L to denounce and threaten Kira]] and the FBI. Along the way, he coolly manipulates the feelings of both people and shinigami. Repeatedly stating that he plans to become the god of the new world he is trying to create doesn't help matters, either.

to:

** Light Yagami begins using the supernatural notebook to rid society of objectively unforgivable criminals, but soon his black list expands to include anyone who stands in his way for any reason, starting with Lind L. Taylor, [[spoiler:a patsy used by L to denounce and threaten Kira]] and the FBI. Along the way, he coolly manipulates the feelings of both people and shinigami. Repeatedly stating that he plans to become the god of the new world he is trying to create doesn't help matters, either.


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* ''WesternAnimation/DarkwingDuck'' has this happen with the most likable villain of the show Dr. Bushroot in his origin episode. He starts off by being DrivenToMurder the people who bullied him, made him lose his job ForTheEvulz and mocked him after his mutation. Then he deteriotates morally by seeking revenge against the Dean who cut his funding and Darkwing and Launchpad for stopping that one and by the end he tries to mutate the girl that he liked against her will, so he could have company. Good Lord!
This list shows the last 10 events of 203. Show all.
http://tvtropes.org/pmwiki/article_history.php?article=Main.JumpingoffTheSlipperySlope