Harry Morgan: Son, there are people out there who do really bad things. Terrible people. And the police can't catch them all. Do you understand what I'm saying?
Teenage Dexter: You're saying... they deserve it.A violent, psychotic killer with a Freudian Excuse gets sick pleasure out of the suffering of his victims. It sounds like he's your basic Serial Killer, right? He would be, but instead of terrorizing the innocent, the Serial-Killer Killer terrorizes the guilty. He spends his life tracking down serial killers so he can give them justice. In short, he's a vigilante, who thinks himself divine justice incarnate. For this reason, he kills them in the same way they'd kill their own victims. Distinct from He Who Fights Monsters because He Who Fights Monsters is more about good characters turning evil in the process of hunting evil, whereas this is more about someone who is evil, or crazy, or both from the outset. Arguably, this guy can be Chaotic Good and be an Anti-Hero, although he walks a VERY dangerous line to become the Knight Templar. A Sub-Trope of The Hunter. See also Vigilante Man, Knight Templar, Pay Evil unto Evil, Hunter of His Own Kind, The Killer Becomes the Killed, Nineties Anti-Hero, and Asshole Victim. Compare and contrast with the similarly named Wife-Basher Basher, which they often are too.
As a Death Trope, all Spoilers will be unmarked ahead. Beware.
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Anime and Manga
- Almost all incarnations of Kira in Death Note fall under this trope, with the exception of the one profit-driven Corrupt Corporate Executive. Most notably, the main character Light is a mix of Knight Templar and A God Am I, believing he'll become the "god of the new world" by completely eradicating the world's criminals. True to the series' penchant of showing what happens to He Who Fights Monsters, a good number of the Kiras Jump Off the Slippery Slope into Knight Templar (such as Light himself) or just plain crazy (such as Mikami) territory.
- Code:Breaker. Some of the Code Breakers recognize that they are evil themselves, though.
- Scar of Fullmetal Alchemist is pretty much this, except replace "serial killer" with "usually unrepentant war criminal", and does indeed kill them using the same power that they use to do their war crimes.
- Diana, Selacao number 11 in Eden of the East, hunts rapists and dispatches them by castration via cigar cutter.
- Vino from Baccano! counts. An incredibly violent assassin, he generally prefers to kill by smashing his targets' faces into the ground from a moving train. However, he takes pride in only killing other criminals, and refuses to do jobs on people who are not guilty. In its main plot aboard the Flying Pussyfoot, Vino actually can be considered the most heroic of those involved, as his brutal murder spree only involves the cultists and gangsters who were trying to harm the passengers. He even saves the comic relief from certain death.
- Kuroko, the protagonist of Murciélago has murdered 725 people, and the only reason she hasn't been given the death sentence is so she can kill other mass-murderers.
- Haseo from DOT Hack, nicknamed "Terror of Death" due to his insistence on killing PKers (which makes him a PKer-Ker).
- Rio from Ana Satsujin mainly kills criminals, though she hates police and makes an exception for them. She will technically kill anyone she feels like, which includes her boyfriend.
- There's a great early Spawn story where Spawn tracks down a child predator who lures kids to their deaths with an ice cream truck. Spawn then proceeds to kill him by stabbing him to death with ice cream bars.
- It could be argued that Rorschach from Watchmen fits in this trope, though he is more commonly placed as He Who Fights Monsters.
- Suture from the comic Curse of Spawn.
- Marv becomes this in the Sin City story, "The Hard Goodbye."
- Cassie Hack in Hack/Slash is a former Final Girl who becomes a slasher-hunter. In one of the later comics, she's even referred to by a talk radio host as the "SKK". Samhain doesn't see the difference between her and any other slasher, a sentiment Cassie really doesn't appreciate.
- The Punisher is a mass murderer who mostly targets organized crime, because a mob hit killed his family
- Venom from Spider-Man (Depending on the Writer).
- Night Raven, from Marvel UK (though his stories take place mostly in the US), has targeted serial murderers, including an unauthorized successor to his mantle, Howard Bates, who had admired Night Raven as a child.
- Andrew Vachss wrote a Predator story where a Predator targeted serial murderers.
- The Harris Comics series Twister featured someone who not only slew serial murderers, but did so by twisting their heads around.
- Frank Miller's Batman. Regular Batman spends his life fearing that he may become this if he ever loses control.
- The Scourge of the Underworld in the Marvel Universe is an entire organization of these — though only a scant handful of its victims are actual killers.
- Sinéad Harkin and the servants of Mother Maiden in The Unforgiving (the base for Within Temptation's album of the same name) are very much this.
- For a time, Morbius would only drink the blood of criminals.
Films — Animation
- The animated movie Justice League: Gods And Monsters despicts an alternate continuity of the DC Universe where Batman, instead of being Bruce Wayne, is Kirk Langstrom, a scientist who accidentally turned himself into a vampire while trying to cure himself from lymphoma (much like Morbius). He deals with the resulting Blood Lust he suffers by feeding on mobs and psychopaths. amusingly enough, he is voiced by Dexter's voice actor
Films — Live-Action
- Agatha Christie's And Then There Were None: U.N. Owen. Except that most of his victims were ordinary murderers rather than serial killers.
- And, technically, "Owen" would be classified as a spree killer, not a serial killer.
- Hannibal Lecter at times.
- The main character of the novel Bad Monkeys claims to be a member of a secret organization devoted to killing people who are just plain evil and unredeemable. Of course, she could be lying. Or not.
- Philo Vance in The Bishop Murder Case.
- A.J. Holt's heroine Jay Fletcher in the two-novel series Watch Me and Catch Me.
- Jeff Povey's POV Character in the novel The Serial Killers Club manages to be invited into the titular organization after he takes down a serial killer...and begins to kill off the membership, one by one. He says he's not a serial killer himself...but he kills again and again...
- Both Shiki and Fujino in Kara no Kyoukai. This is part of the reason why the part of the story where they fight is the only one where both agonists get out okay, more-or-less. (Well, that and the one where the antagonist has Mind Control to stop Shiki from attacking him...)
- Some of the vampires in Anne Rice's books tend to be this. Post-Akasha Lestat mostly kills and drinks mobsters, muggers, and the like... but sometimes cannot control himself and kills someone he deems particularly impressive. Another vampire, Pandora, when we meet her, is hunting a drug dealer.
- All of the victims in Regina's Song had criminal records to some degree, but the one the killer was explicitly looking for while she thinned out Seattle's rapist population was a serial killer. At her trial, one of the witnesses remarks that there was a perverse charm in one serial killer dying at the hands of another.
- John Cleaver of the I Am Not a Serial Killer books is this, with the added twist that the killers he hunts are not human.
- The Dexter novels go a bit further than the show — not only do we have Dexter, the two children he's raising are damaged in much the same way he is, and he's trying to teach them to be like him so as to prevent them from becoming even worse.
- Edward Cullen from The Twilight Saga spent a few years killing serial killers during his "rebellious" phase against Carlisle's vegetarian vampirism philosophy.
- The murderer in the Kurt Wallander novel The Fifth Woman turns out to be a rare female example of this trope.
- The narrator of The Laundry Series describes Vampire Hunters as this, even making a direct comparison to Dexter.
Live Action TV
- Dexter, adaptation of the book Darkly Dreaming Dexter (in season 2, the series took a different direction than the books). Dexter realizes that he's evil, but has been programmed to live within a set of standards that are supposed to place him above common murderers. He sometimes allows himself to fantasize that he is a dark avenger of the innocent.
- In The Inside, the episode "Prefiler"'s titular character, played by a pre-Lost Michael Emerson, profiled potential serial killers, tracked them down before they got a chance to kill, and killed them using their own intended methods.
- Clifford Banks in Murder One is a subversion: although most of his victims were unconvicted serial killers, his first ever victim was his brother, whose murder he forgot and mentally pinned on a burglar. Ironically, this is what led him on the killer-killing path.
- Angel: After Angel gets his soul back, Darla accuses him of being this when he tries to win her back. She says that while he has been killing, it's only been "murderers and rapists." Then she tried to make him kill a baby to prove himself.
- In the very first episode of Tales from the Crypt, "The Man Who Was Death", Niles Talbot is an executioner who was recently fired after the death penalty was abolished in his town. As a result, he goes on a killing spree, killing those who murdered people and escaped justice by various means of electrocution. However, eventually karma bites him in the ass when the tables are turned on him and he is executed using his preferred method just as it was reinstated.
- Madame Vastra, a Silurian living in Victorian London in Doctor Who, eats Jack the Ripper, apparently with Inspector Abberline's blessing.
- An episode of Law & Order: Special Victims Unit has a woman deceive who can't handle that she killed a torturous murderer.
- The 90's revival The Outer Limits (1995) did an episode ("Stitch In Time") where an unbalanced female scientist uses her time machine to go back and execute famous serial killers before they hurt anybody. Her resulting Ripple Effect-Proof Memory does not improve her mental state...
- Hannibal Lecter is an unrepentant serial killer, but he also murders other serial killers such as Tobias, Georgia, and the "muralist" in the course of the show. He subverts this trope, however, since he kills the above serial killers to, respectively, defend himself, to destroy evidence of his own crimes, or to express his artistic side and respect for the killer's work.
- Will Graham has a touch of this trope played straight. Every person he's tried to kill (with or without success) was a serial killer. It's in his job to catch them, but Will enjoys killing in a way that both terrifies and thrills him. It's ambiguous about how much this comes from He Who Fights Monsters and how much is naturally there inside Will.
- The Forgotten Realms of Dungeons & Dragons have this as the encouraged behavior of the priests of the little-known deity Hoar, Lawful Neutral god of retribution. Specialty priests of Hoar are called Doombringers, and are highly encouraged to kill or otherwise punish (as appropriate for the crime) criminals in a manner befitting the criminal's own misdeeds, especially if they can inflict an ironic punishment.
- Similarly, Mage: The Ascension has the Tradition of the Euthanatos. The Euthanatos view existence as a continual cycle of death and rebirth — "the Wheel" — and those who unbalance the Wheel through atrocities must be dealt with so that things can be set right.
- Werewolf: The Apocalypse:
- The tribal laws of the Black Furies forbid them from turning a blind eye to violence against women. Domestic abusers, sexual predators, and serial killers who murder women are all legitimate targets for them.
- One of the most depraved antagonists in the game is the Seventh Generation, a Wyrm cult that kidnaps children and uses them as human sacrifices. The Seventh Generation's killings and depraved rites have earned it enemies who hunt its members without mercy. For example, the Order of the Rose, an underground organization described in Rage Across New York, hunts down Seventh Generation devotees. Also, one of King Albrecht's first projects after ascending the throne was orchestrating a Garou attack on the Seventh Generation. The result was a slaughter of almost all Seventh Generation members.
- Garou see killing wolves as a grave offense, and some Garou target hunters who slaughter wolves. Several characters in the Warriors of the Apocalypse character book, such as Volcheka Ibarruri and Gere Hunts-The-Hunters, torture and kill wolf hunters.
- In Anathema, your job is to murder people in order to control the global population. Players can choose to act as this. Additionally, if you fail to meet your daily kill quotas enough times, other shrouds will hunt you down and destroy you.
- Serial Killer X from Condemned: Criminal Origins. Spying on FBI Agent Ethan Thomas, SKX figured out the identities of ten other Serial Killers and murdered them in the way they did their victims, which caused them to be confused for their own victims by the authorities and the investigation to go cold, thus keeping X's involvement unknown. In the sequel, his goals have shifted to dissecting people in an effort to give himself superpowers.
- Haseo, the Player Killer Killer from .hack//Roots and Dot Hack GU. Player Killing and Player Killer Killing (ad infinitum) is Serious Business in The World.
- The Vigilante alignment in City of Heroes is basically a Hero who kills instead of arrests.
- Alex Mercer from [PROTOTYPE] in a way. He kills thousands of comparatively blameless soldiers to get to their leaders, the ones responsible for the outbreak of the disease ravaging Manhattan, and kill them. His reasoning, insofar as 'reason' factors into anything Alex does, seems to be that however many people he kills, his targets are responsible for both far more deaths and much uglier crimes. Of course, his conscience is still developing throughout the game, so at the beginning he was just a plain-old mass murderer... of guys who were trying to kill him for reasons he didn't understand at that point. (Unless he also killed civilians.)
- In [PROTOTYPE 2], if you don't kill civilians and try to reign in any Marine deaths, then this trope is played straight. Everyone in Blackwatch is evil. Every. Single. Soldier.
- In The Cat Lady, Susan Ashworth's primary goal is to kill five serial killers, called "Parasites".
- Garrus Vakarian in the Mass Effect series between the first and second games. He became a vigilante in the in-universe Wretched Hive, hunting down all sorts of criminals, often administering poetic justice against the more particularly heinous ones. He brutalized a slaver, killed a drug dealer using the same addictive and deadly drug the dealer sold, killed a specialist in biological warfare with a virus, and killed a dangerous saboteur by causing a space suit malfunction.
- Matheiu Bellamont from The Elder Scrolls IV: Oblivion. On one hand, he's a murderous lunatic with an incredibly disturbing Torture Cellar cum Room Full of Crazy. On the other hand, he only kills members of the Dark Brotherhood. To make it even more sketchy, he's not even the one that kills a lot of them!
- In both MadWorld and Anarchy Reigns, Jack fits this well, and he is very good at it.
- Travis Touchdown of No More Heroes only kills other killers.
- Dark Souls has the Blades of Darkmoon covenant, which allows you to hunt down and invade players who have been indicted for PvP by doing it too much, cheating at it, or for killing Dark Sun Gwyndolyn, the covenant's leader.
- James Cash of Manhunt becomes this, technically; he is hunting down and brutally murdering people for Starkweather's Snuff Film, even using slasher-type methods of hunting and butchering, and the people he kills are Starkweather's "workers", which means they're all guilty of multiple murder as well.
- Tormentor from the unreleased fighting game Thrill Kill is a judge executed in the electric chair after it was found out he aquitted criminals just so he could later torture and kill them instead.
- The Onion "Series Of Serial-Killer Killings Rocks Serial-Killer Community"
- Worm: Glaistig Uaine spent much of her pre-teen life hunting down and killing some of the most powerful supervillains on the planet, including Gray Boy.
- The Global Guardians PBEM Universe had The Confessor. The Confessor obsessively hunted down and murdered (usually in a very Karmic Death) other serial killers. When the heroes finally captured him, and one pointed out to the Confessor that he, himself, was a serial killer, The Confessor delivered the Hannibal Lecture to end all Hannibal Lectures.
- The Dove was also a Serial-Killer Killer, but honestly thought he was the hero of his own story.
- If they kill multiple serial killers, wouldn't they be a Serial Serial Killer Killer?