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Slowly Slipping Into Evil
I met her on her first night in costume. She seemed genuinely interested in becoming a hero. I suspected she would go that route on her own, so I didnĺt push her towards the Wards. I ran into her two more times after that, and the reports from other events match up. She went further and further with each incident. More violent, more ruthless. Every time I saw it or heard about it, I expected her to get scared off, to change directions, she did the opposite. She only plunged in deeper.
Armsmaster on Skitter, Worm

A recurring scenario where a character, after committing a small act of evil, finds himself becoming more and more evil, very often far more than he originally planned or intended.

Sometimes you can see what you want just beyond your reach—you don't have to jump off the slope, and it's not all that steep anyway, just a few steps on The Dark Side and you'll have it. Yet what was just a short walk in one direction is not so easily traveled in reverse. Even if you turn back immediately afterwards, you find yourself slipping down the slope faster than you can climb your way up! Eventually you may tire of fighting it and just let yourself continue to slide unhindered, or even worse: choosing to embrace the inevitable and turn your steps in the direction of your momentum.

This can be done for different purposes:

  • A warning that doing some evil, no matter how good an idea it seems, is always a bad idea.
  • A warning that once you commit an evil act, no matter how small, you are tempted or otherwise persuaded to commit more and more evil.

For obvious reasons, almost mandatory in Start of Darkness stories. See Moral Event Horizon for when someone commits an act so heinous and unforgivable that he is now unquestionably evil, and often marks the end point of this character arc. See also Had to Come to Prison to Be a Crook, which is when one of the reasons for falling is spending time in jail, and This Is Your Brain on Evil, for when performing an evil act is akin to drug intoxication, and thus very likely to provoke this trope. Do not confuse with Jumping Off the Slippery Slope, which is when someone on the same side of the heroes but on a morally gray path commits an evil act to prove the rightness of the heroes' path.

Supertrope of He Who Fights Monsters, wherein fighting against evil is the thing that causes the person to slip into evil. See also Protagonist Journey to Villain.


Examples:

    open/close all folders 

    Anime and Manga 
  • Lelouch and Suzaku in Code Geass become more and more radical during the show's progress, although their goals were noble and successful.
  • Naruto:
    • Sasuke didn't just slide down the slippery slope, he grabbed the sled Itachi stupidly gave him on the way to the edge so he could get down faster. First, he betrayed the village by joining Orochimaru just so he could get strong enough to kill Itachi. He at least had some qualms about killing at this point. Later on, after killing Itachi, he learns that Itachi massacred their clan under orders from four of the higher ups (one of which was against it but overruled) in order to stop a civil war that could develop into a world war. Naturally, Sasuke decides that the entire village has to die because of this. By the time he reaches Konoha, he is not above cold-blooded murder of even his allies just to accomplish his goals.
    • And he gets worse! Regardless of his statements of genocide, at first he tried to protect the friends that helped him on his revenge quest. Later, however, he'd gotten to the point that anyone who inconveniences him or his goal must die. Poor Karin.
      • This is later revealed to be caused by a genetic disorder, which drives members of the Uchiha clan insane.
  • Light from Death Note goes from dark Anti-Hero to full Villain Protagonist during the course of the series (going from killing criminals to suggest killing lazy people). It's implied that the eponymous Artifact of Doom is the cause of this, not through any supernatural means, but just because power corrupts.
  • In Saint Beast, Zeus' slip starts with overthrowing the old gods, which he feels a measure of regret about, but thanks (in part) to Lucifer's support, by the time Judas suggests purging the evil angels in heaven, Zeus has basically lost it and keeps getting worse.

    Comicbooks 
  • Winnowilll in ElfQuest is initially at least reluctant to kill to further her ends. Ironically, her descent into cold-blooded murderess seems to be at least partially due to a botched mind-healing attempt by Leetah.
  • Officer Bill Petit in Batman: No Man's Land is a textbook case of a Well-Intentioned Extremist going Drunk with Power:
    • He starts off as a loyal member of Commissioner Gordon's "Blue Boys" trying to maintain order in Gotham, and though he advocates a more ruthless approach to the various psychopaths and criminals they have to deal with, it's hard to argue against him in light of the fact that there's no longer even a Cardboard Prison to keep them in, and innocent people are being murdered every day as the gangs fight for turf.
    • Later, while still a member of Gordon's team, he publicly executes one known murderer to convince the other criminals that the Blue Boys aren't kidding when they tell them not to cause trouble. Gordon calls him out for this, but Petit's reasoning is sufficiently sound that they can't really call him a murderer, and they let him stay a member of their team.
    • Later, he leaves Gordon's team out of disgust for their maintaining their soft approach to crime even when it's clearly not working, but is justified enough that a large number of the Blue Boys leave with him, and neither Gordon nor Petit consider each other enemies at this point.
    • Then, after realising Oracle is an invaluable source of information, he launches an attack on her tower to bring her in alive, but tries to kill Nightwing when he intervenes, prompting Huntress (who had been swayed by his arguments and actually joined him willingly,) to intervene, but Petit and Huntress agree to keep working together.
    • By the end of his arc, after Batman's return and aid to Gordon has made the Blue Boys more effective, he's become so paranoid about losing face in front of his own men and criminals (he calls it "loss of morale") that he forces all the residents of his territory to attend his "Christmas feast", and won't let them leave without his permission, even when the Joker attacks. Finally, he starts shooting left and right at people he thinks are the Joker, even though his own people are warning him that it's a Disguised Hostage Gambit, and then when one of his most loyal subordinates tries to leave to get reinforcements, Petit shoots him on the spot while screaming "No-one leaves without my permission".

    Fan Fiction 

    Film 
  • Michael Corleone in The Godfather.
  • Christopher Eccleston's character in Shallow Grave.
  • Anakin started to feel doubt and hatred in Star Wars: Attack of the Clones, killing an entire population resposible for killing his mother (regardless of individual involvement). If not that, then Sidious manipulating him into killing Dooku probably marks the pivot, and the children's slaughter the end of the slope.
  • Peter Parker in Spider-Man 3 slides very slowly. First, he combs his hair differently, then he refuses to pay his rent to his landlord until his door is fixed, and after that he finally performs evil acts, such as emotionally manipulating his friends and co-workers, punching his love interest (accidentally), and performing a very awkward jazz number for no obvious reason.
  • Stephen in The Ides Of March goes from idealism to cynicism and worse.
  • Magneto in X-Men: First Class; a really good and interesting example in that he starts the movie already as an Anti-Hero and spends most of the movie establishing his attitude that would cause him to slip into evil before he actually does so. And while he's undeniably a Jerk Ass in opposition to the heroes by the end of the movie, he still isn't evil and never really crosses the Moral Event Horizon.
  • Discussed in The Elite Squad with regards to Dirty Cops.
    The first time is always for a good cause. But once you steal for the force you'll also steal for your family. That's how the system works.
  • RoboCop (2014):
    • Dr. Norton. At the start, he doesn't want anything to do with weaponising his cyborg technology, but Sellars talks him into working on RoboCop. As the film goes onm he starts making bigger compromises, such as tinkering with Alex's brain and body chemistry, which have the effect of reducing his humanity. Eventually, however, he realizes just how far he's gone and seeks to repair the damage.
    • Sellars himself. He begins the film as a guy who simply wants to sell his machines to the American government, and unlike his counterpart in the original, those machines actually work. He slowly toys more and more with Murphy, treating him less as a man and more of a useful product as the plot goes on, and once he utters "you know what's better than a hero? A dead hero", you know there is no turning back.

    Literature 
  • In Memory, Sorrow, and Thorn, this trope in a nutshell is the Backstory of the Big Bad, the 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 Things Man Was Not Meant To Know and constructed a weapon so terrible that his father, the king, insisted he destroy it. Maddened by this rejection and by his torments, Ineluki murdered his father and took the crown, leading a final, futile resistance against the humans that ended in his death via Dangerous Forbidden Technique. He is at the start of the story the Big Bad and an Omnicidal Maniac.
  • Conall Haldane in the Deryni novels The King's Justice and The Quest for Saint Camber goes from merely being a Royal Brat and Sore Loser to committing murder and treason. He says as much at his trial: "I didn't start out to betray you, Kelson," he sobbed, "but things — happened. It wasn't fair!"
  • This is the big reason why the Laws of Magic exist, and why the Wardens exist to enforce them in The Dresden Files. The types of magic prohibited by the Laws all lead the caster to want to use them more often, eventually turning him into a villain. The Wardens will sometimes grant clemency on the first offense if it can be proven that the offender didn't know any better and a senior wizard offers an apprenticeship to oversee the offender's redemption. In any other case, summary execution is prescribed.
    • Also, this is a major fear of Harry's after taking up the mantle of the Winter Knight, more so after he finds out that this basically dooms him to becoming a monster.
    • The roleplaying game reflects this by giving Lawbreakers mandatory stunts that cost them refresh whether they like it or not but provide them with bonuses towards breaking the same laws again. Of course, they technically never have to use those bonuses (which come with additional drawbacks if one keeps taking advantage of them anyway, literally changing who the character is over time as he or she gets twisted by the ongoing practice of forbidden magic), but once things get desperate and the temptation great enough...?
  • A major fear for the kids in Animorphs.
    RACHEL: (narrating) "I know it's wrong," he said. "But it doesn't matter. We have to do it. It's a war. We have to win." I had to laugh. People sometimes think that I'm a bad person, a violent person. But even I know that the words "we have to win" are the first four steps down the road to hell.
  • In Sherlock Holmes story "A man with a twisted lip", the resolution is that a respectable journalist first poses as a beggar for the sake of research, then discovers this pays way more than his job (if done artistically enough), then uses begging to get out of a medical debt, and finally abandons journalism altogether, becoming professional beggar.
  • Gingema's Daughter, the first book in Sergey Sukhinov's Emerald City series, is about the adventures of Corina, originally an ordinary, if somewhat lazy, girl. She starts her way as undertudy of Gingema, then runs away to travel with her wolf companion. She lives by different families, usually helping them magically in secret. But gradually, she decides that Being Good Sucks, since everybody bothers you with requests, and being feared is as important as being loved. She deceives the Woodsman to do her bidding by pretending to be the daughter of his former sweetheart, and ultimately manipulates him into deposing the Scarecrow, thus becoming the ruler of Emerald City. The rulership she establishes is a Crap Saccharine World: there is food for free and low taxes, but do cross Corina in any way and you are dead or turned into a small animal. By the second book, she kills Ellie's parents and becomes a fully-fledged villain.
  • Made explicit in CS Lewis's The Screwtape Letters, which is a satirical exploration of Christian theology, detailing a senior demon's advice to his nephew on securing the damnation of a human — the safest road to hell is the gradual one — the gentle slope, soft underfoot, without sudden turnings, without milestones, without signposts.

    Live-Action TV 
  • 24: This is one of of the main points behind Jack's arc in the final season: after losing another loved one thanks to the conspiracy of the season and being denied justice against her killers when the President of the United States betrays him, he snaps and goes on a Roaring Rampage of Revenge to slaughter everyone behind said conspiracy. The thing that kicks him down the path is when he executes one of those involved in the plot that didn't even have to do with the murder. After this, his actions get much more brutal and violent with each episode, with him even starting to unintentionally endanger innocent people as he slowly becomes just as bad as the villains. Chloe manages to snap him back to his senses in the series finale before he crosses the last line and unwittingly starts World War III.
  • Boardwalk Empire: Jimmy Darmody has a conversation with his wife in the second season about how every time he draws a line in the sand, he winds up having to cross it to be a successful gangster. This eventually results in him doing all sorts of things he never thought he'd do, and that other people are horrified by, including ordering the assassination of his father figure Nucky.
  • Breaking Bad: The whole point. Walter White starts as a chemistry teacher who gets cancer, so he begins to make meth as a way to leave money for his family. Then, his actions become not only much less justified, but also he goes on to kill and begins some big schemes.
  • Merlin: Morgana has a long-term one of these over the course of the second and third series. Of course, this is usually conveniently forgotten about when she is not directly the antagonist of each plot of the week.
  • Once Upon a Time: Regina becomes increasingly dark and angry after her mother, Cora, kills her boyfriend. She has evil thoughts about killing Snow, who she blamed for her telling Cora about Regina, and Daniel. After she banishes her mother by using magic, she tells Rumplestiltskin "I'll never use magic again." He asks why, she says "Because I ''loved'' it". And she still manages to remain good, despite this causing an addiction, and she refuses to obey Rumplestiltskin. Then, he gives her a Hope Spot to make her grow insane and think that she should get revenge because it is all she will believe that she has left to do. It works.
  • Revolution: Ever since Rachel Matheson made a deal with the devil named Randall Flynn to ensure Danny's survival from birth ("The Children's Crusade"), this trope has been happening to her. She killed the Wiry Stranger when he tried to steal food from the Mathesons ("Chained Heat"). She turned herself into Miles's custody to allow her family to escape his clutches ("The Plague Dogs"). She apparently refused to reveal or do anything for 7 years...until Danny ends up in Monroe's custody ("Soul Train"). Then she reveals enough information to get her old colleague Bradley Jaffe and his daughter in trouble. She ended up killing Jaffe to save her own life and Danny's ("Kashmir"). She insists on destroying the pendants rather than letting Team Matheson use them. She pulls out a nanotech capsule from Danny's corpse ("The Stand"). She slapped Charlie where her daughter tried to call her out on leaving them all those years ago ("Ghosts"). On Rachel and Aaron's journey to the Tower, Rachel tries stealing the information she needs from her old colleague Jane Warren and nearly got killed for it ("The Night the Lights Went Out in Georgia"). Then she steals food from a tribe, shoots the tribe leader when he threatens to kill them, and gets in big trouble for it ("The Love Boat"). Finally, she leads a family to believe that she can save their boy from death, and then reveals to Aaron that she's not trying to restore power for anyone's good, but rather to give the people the power to kill Monroe as revenge for killing Danny. She is also willing to throw Aaron under the bus to achieve her revenge ("The Longest Day"). She has been sinking to new lows as the series goes on.
  • Smallville: Lex Luthor has this happen to him over the course of this show, going from close friend of Clark's and genuinely good guy to evil villain over the course of the series. Lampshaded when he tells Ryan that 'Evil is a journey, not a light switch'.
  • Star Trek: Deep Space Nine: Gul Dukat was always a nasty authoritarian, but in early seasons would help the good guys on a pragmatic basis. After the Dominion War started, he aligned Cardassia with the Founders. When that didn't work, he became a full-on Omnicidal Maniac.
  • Kamen Rider Gaim: Kureshima Mitsuzane. He starts off as an overall nice guy, sidekick, and good friend to the Hero, and the brains to his brawn. As the series progresses, he starts showing a darker side to himself. He begins attempting to manipulate his friends and outright lying to them, hiding vital information, and allying with the Yggdrasil Corporation they are against. While all this was done in order to protect his friends, he starts feeling that using those methods is the only way to accomplish that, and keeps doing so. Once Kouta, the series protagonist, starts unknowingly hindering his plans to keep everyone he cares about safe, he slowly starts to lose it and the situation gets even worse when his friends find out the truth and side with Kouta instead of him. Mitsuzane's solution to this development? To ally himself with the resident Mad Scientist and shoot Kouta in the back while he's distracted. Although he fails to kill him, it gets worse from then on as he stands idly while his older brother is seemingly murdered, takes his Transformation Trinket and tries to commit first degree murder on Kouta once more while keeping the fašade that he is his brother Takatora, who Kouta befriended not too long ago, and acting like he's still Kouta's best friend whenever they meet untransformed. To top things off: After once more standing by and letting an ally get killed, even if that person was the Hate Sink of the series, he allies himself with Redyue, the resident Psychopathic Womanchild, and his acts get even more despicable. To the point that he's shown his true face to Kouta while trying to verbally break him and also beating him up untransformed. When Takatora shows up, still alive, and decides Mitsuzane needs to be stopped, they fight. Takatora hesitates in giving the coup de grace... Mitsuzane doesn't.
  • It's been heavily implied in Doctor Who that the Doctor is terrified of this happening to him. And in fact, during his first adventure, he almost killed a caveman with a rock, until Ian intervened. Which is why he likes to have humans around him at all times. Because they keep his good side in check. Donna Noble's actions in "The Fires of Pompeii" was a good example.

    Tabletop Games 
  • Deadlands uses this as part of the two most extreme Dark Gray Hat character types. Vampires, in Deadlands Classic, and Anti-Templars, in the post-apocalyptic Deadlands: Hell on Earth setting. Both have backstories that they will inevitably fall to corruption or die, and in a case of Gameplay and Story Integration, these are backed by mechanics that eventually determine when the player becomes invalid.
  • In Ravenloft, performing an evil deed and certain other actions result in what is called a Dark Powers Check, to see if the forces that govern the Demiplane of Dread take notice. If they do, the Dark Powers simultaneously imbue them with a blessing and smite them with a curse. These powers and curses grow with each subsequent failed check, until inevitably the victim becomes a monster, perhaps even a Dark Lord in their own right.
  • This is a common feature through the New World of Darkness, but it's most applicable to Vampire: The Requiem and Demon: The Descent.

    Video Games 

    Webcomics 
  • In Book 9, Part V of Schlock Mercenary, General Xinchub is revealed to have gone through one of these:
    Xinchub: I sold my soul a long time ago, believing that I was helping Humanity, and all our Terran cousins. I've done all kinds of atrocious things, and somewhere along the line I started to enjoy them.
    Ceeta: Happy memories?
    Xinchub: Yeah, good times, good times.

    Web Original 

    Western Animation 

    Truth In Television 
  • The subject of this journal article made friends with a drug dealer, then started to help him run his gang, then shot a man in self-defense... By the end of his criminal career, he had killed fifteen people and was prepared to commit murder merely to "safeguard his reputation."


Rejected ApologyHeel Face IndexVillainy Discretion Shot
Slouch of VillainyEvil TropesSorting Algorithm of Evil

alternative title(s): Sliding Down The Slippery Slope
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