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[[quoteright:336:[[WesternAnimation/{{Futurama}} http://static.tvtropes.org/pmwiki/pub/images/robotpsycho01_8067.png]]]]
[[caption-width-right:336:He's not crazy! He's just not user-friendly!!]]

->''"Definition: Love is making a shot to the knees of a target 300 kilometres away using an Aratech sniper rifle with a tri-light scope."''
-->-- '''HK-47''', '''''VideoGame/KnightsOfTheOldRepublicIITheSithLords'''''

[[ExactlyWhatItSaysOnTheTin A psychopath who's also a robot]]. Compare AIIsACrapshoot where the robot isn't intended to be evil. Expect a lot of CrushKillDestroy. If they happen to be a good guy (or at least working for the good guy), they'll probably be a SociopathicHero.

See SecondLawMyAss for a milder form of this behavior.

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!!Examples

[[foldercontrol]]

[[folder:Anime and Manga]]
* Red Destiny in ''Anime/TheBigO.''
* The Androids from ''Manga/DragonBall'' and ''Manga/DragonBall Z'' were intended by their creator(s) to be these, but [[AIIsACrapshoot almost all of them ended up turning]] ''[[HeelFaceTurn good]]'', the main exceptions being the ones in Future Trunks's timeline / dimension.
* Brau 1589 from {{Pluto}}, the first and only robot to ever kill a human because he wanted to. His personality and role is an {{expy}} of Hannibal Lector, to give you a sense of what we're talking about.
* Machinedramon from ''Anime/DigimonAdventure''. Despite his CreepyMonotone voice, he's a psychopathic monster who takes sadistic pleasure in destroying everything in his path.
[[/folder]]

[[folder:Comic Books]]
* ComicBook/DeathsHead
* Comicbook/TheAvengers' Arch-enemy ComicBook/{{Ultron}}.
* Most incarnations of the Superman villain {{Brainiac}}.
* ComicBook/JudgeDredd's first mega-arc was centered on an uprising by a berserk robot named "Call-Me-Kenneth", raising an entire army of these from regular robot appliances. Before that, there was a psychotic car.
* ComicBook/XMen villain Bastion, an android that was the fusion of the Sentinels Master Mold and Nimrod, eventually became this. In the climax of "X-Men: Second Coming", Bastion admitted that wiping out mutantkind wasn't just a matter of programming anymore. He genuinely hated mutants and relished the thought of killing Hope.
[[/folder]]

[[folder:Film]]
* The Franchise/{{Terminator}}s. Or at least all the ones that haven't been reprogrammed.
** In ''TheSarahConnorChronicles'', we find out that this isn't actually true. They are not programmed to be cruel, but simply to complete the mission as efficiently as possible. It's just that usually the most efficient path involves murder and torture.
* ED-209 from ''Film/RoboCop1987''. Being the brain child of a CorruptCorporateExecutive, it's unclear how much of it is a design flaw versus intentional programming.
** Dick Jones himself tries to invoke this trope when [[spoiler: Franchise/RoboCop comes to arrest him at the end of the movie]]. "This is absurd! That ''[[JustAMachine thing]]'' is a violent mechanical psychopath!" It doesn't work.
* The Showa (original) [[Film/GodzillaVsMechagodzilla Mechagodzilla]] was a HumongousMecha KillerRobot whose rampage through Japan was exactly what its designers wanted it to do. During the course of said rampage, it killed several thousand people, beat Anguirus to a pulp, and nearly killed Godzilla ''and'' King Ceasar. One {{Badass}} TinCanRobot.
* Maximillian in ''Film/TheBlackHole'' was not only murderous, but creepy as all hell, too. That [[CyberCyclops red cyclopian eye]], those drill arms, its hovering frame, its [[HellIsThatNoise implacable ominous hum]], and the way it never ever speaks (or ''anything'' else even remotely human, for that matter).
[[/folder]]

[[folder:Literature]]
* Literature/TheCulture designs their warships this way because it makes them more efficient killers. Drones in Special Circumstances share this trait. Even Drones who act like [[StarWars C3PO]] most of the time can be remorseless murderers. They tend to work for Special Circumstances and thus get more screentime then normal Minds and Drones, but are actually only a very small minority in the entire Culture. Special mention for the Meatfucker, a Ship Mind nicknamed for its hobby of [[MindRape mindraping]] tyrants and other evils and who even other Culture warships see as a psycho.
* ''Tik-Tok'' (not [[ReturnToOz that one]]) by John Sladek. One day, he discovers that he isn't ThreeLawsCompliant after all, decides the whole concept is a collective delusion, and proceeds to indulge in various horrible crimes.
* In the ''Caliban'' trilogy by Roger [=MacBride=] Allen, half the planet assumes that the titular robot will turn out like this because he is not only not ThreeLawsCompliant, he has no laws whatsoever. While he does commit a number of crimes, both willingly and unintentionally (leaving a crime scene without making a statement to the police, destruction of private property, arson, attempted blackmail, escaping police custody, theft), he is willing to accept responsibility for said actions at the appropriate time. In fact, [[spoiler: he only injures or kills another person deliberately once, and the person he kills is another robot. His predecessor, Ariel, is not so restrained, having deliberately assaulted her creator]]. Caliban's logic for not killing is simple: The police know that he is a No-Law robot, so he will be considered a suspect if someone dies while he's around. If he kills, they have a good chance of figuring it out, at which point he will be hunted down and shot.
* Antrax from ''Literature/TheVoyageOfTheJerleShannara'', who is doing ''exactly'' what it was programmed to do: protect the books of knowledge, [[KnightTemplar no matter who it has to kill to do so]].
* Joe in Creator/HenryKuttner's ''Robots Have No Tails'' is an early example, possibly the TropeMaker. He's in love with himself, gets angry when people don't display attraction to him, has no moral code whatsoever, and, worst of all, possesses superhuman powers. At one point in "Gallegher Plus," he arguably [[spoiler: date-rapes one of his master's creditors]] because said man was "insensitive to [Joe's] beauty." As is everything else in ''Robots Have No Tails'', his character is completely PlayedForLaughs.
* "Fondly Fahrenheit" by Alfred Bester has a lot of confusion about whether the robot is a murderous maniac, or its owner, or both.
[[/folder]]

[[folder:Live Action TV]]
* ''Series/BuffyTheVampireSlayer'': Adam was built to be a weapon, and as such is incapable of caring about anyone.
* Brainiac in ''{{Smallville}}'' combines this trope with (alphabetically) EvilGenius, GrandTheftMe, MisanthropeSupreme, and OmnicidalManiac. He was wired this way from the start by General Zod, who sought to use him as his [[TheDragon Dragon]]; after Zod's defeat, Brainiac goes rogue and creates his own agenda for TheEndOfTheWorldAsWeKnowIt. Metallo, in Season 9, is another example. Assembled by Major Zod (a younger clone of the General), the machines he's slaved to continually inject him with adrenaline, sending his aggression into overdrive; he's effectively KnightTemplarBigBrother meets this trope, with a nice dose of BodyHorror and HollywoodCyborg on the side.. Although [[spoiler: they both HeelFaceTurn]] it is due to being reprogrammed, not altruism on their own part.
* Lore, Data's EvilTwin from ''Series/StarTrekTheNextGeneration''.
* ''Series/AlmostHuman'' has the XRN "Danica", a prototype police android, that went homicidal during its first demonstration and slaughtered a number of [=VIPs=]. When the police were called in, it kept them in a running battle for 36 hours and killed 26 police officers before it was finally stopped. When it is resurrected in the present, it goes on a similar rampage [[spoiler: but this time it is under orders from its creator]].
* ''Series/RedDwarf'': In "Demons and Angels", Low Kryten is an evil mechanoid designed to hurt people. He tortures Lister along with the rest of his crewmates.
[[/folder]]

[[folder:Role-Playing Games]]
* The Brickspider Bot v1.0 from ''Roleplay/DinoAttackRPG''.
[[/folder]]

[[folder:Video Games]]
* HK-47 from ''VideoGame/KnightsOfTheOldRepublic'', and his HK-50 knockoffs from the sequel.
** [[DummiedOut Cut content]] makes the HK-50s ''worse''. HK-47 is proud of generally being a precision weapon that ''doesn't'' have to [[EvenEvilHasStandards resort to wanton slaughter]]. The HK-50s refer to their function ''as'' wanton slaughter.
* Possibly inspired by HK-47, PROXY, your RobotBuddy from ''VideoGame/TheForceUnleashed'', is programmed to try to kill you again and again. What makes him [[CounterpartComparison different from HK]] is that [[FriendlyEnemy PROXY is friends with Starkiller when he's not trying to kill him]], and doesn't seem to understand that fulfilling his primary function would also mean the end of their friendship.
* E-123 Omega in ''SonicTheHedgehog''. The Bioware-made ''[[VideoGame/SonicChronicles Chronicles]]'' lampshades the similarity to HK-47.
** To a more sinister extent, Metal Sonic, who was driven mad by constant losses.
* [[strike:Alpha 2]] [[InsistentTerminology Abomination the Second, son of the great protector of Lamar]] from ''TheNamelessMod''.
* Omega from ''VideoGame/MegaManZero'' personifies this trope almost as much as HK-47 does.
* R-110 from ''VideoGame/TimeSplitters: Future Perfect'' may not follow this trope from the start, but once he gets that virus at the start of the second level with him, he fully embraces the trope:
-->'''R-110''': What's the difference between a human, and a lump of rotting meat? About one week!
* The toaster from ''VideoGame/FalloutNewVegas' Old World Blues'' expansion. Rendered somewhat ineffectual by being, well, ''a toaster''.
-->'''Toaster:''' Buddy, if my heating element were just a little bigger, you'd be on fire right now. '''On fire!'''
* [[CuteAndPsycho Lisa]] from ''VideoGame/PhantasyStarOnline2''.
* In the VisualNovel ''VisualNovel/BionicHeart'', Tanya goes on a killing spree after she realizes that she was given [[spoiler:the brain of a serial killer]] when the resident MegaCorp illegally created her and other {{Artificial Human}}s from preserved brains in PeopleJars.
[[/folder]]

[[folder:Web Comics]]
* Warmech in ''Webcomic/EightBitTheater''.
* The Red Robot from ''DieselSweeties''.
* Zeke in ''CtrlAltDel'' started life in this trope and has mellowed to a degree. Embla, as a newly constructed robot, hasn't had enough experience of humans (specifically, human video games) to do so.
** Well more specifically he started as a blank slate (though probably influenced by HK-47, given his creator is a gamer), then after some encounters with humans became this trope, ''then'' started to mellow out... somewhat.
* Castle Heterodyne in ''Webcomic/GirlGenius''.
* While not '''''nearly''''' as bad as some of the other examples on this page, you could make a very convincing case for Pintsize of QuestionableContent to be here.
* Ping from ''Webcomic/MegaTokyo'' has a flaw in her programming which makes her become this in response to rejection. It proves useful against a giant monster.
* In ''Webcomic/{{Freefall}}'', the ship positively ''hates'' Sam, and until talked to by [[UpliftedAnimal Florence]] was trying to kill him. It now will settle for an occasional maiming.
* Vaporware from ''Webcomic/CheckerboardNightmare'', who later found his way into ''Webcomic/{{Starslip}}'', embodies this trope [[InvokedTrope by design.]] [[spoiler: Not long after he was 'upgraded' to a benevolent AI, he was thrown into a sun.]]
[[/folder]]

[[folder:Web Original]]
* [[WebVideo/AtopTheFourthWall Mechakara]]
* The ''Wiki/SCPFoundation'' has [[http://www.scp-wiki.net/scp-1370/ SCP-1370]], who is a robot who wants to [[DestroyAllHumans kill all humans]] and [[OmnicidalManiac more or less destroy anything else it considers sapient]]. Unfortunately, it's very poorly designed for this task and is so comically incompetent that it's more of a HarmlessVillain. [[EpicFail It loses a fistfight to a potted house plant.]]
[[/folder]]

[[folder:Western Animation]]
* Roberto from ''WesternAnimation/{{Futurama}}''. He claims that the engineers who created him ''wanted'' him to be criminally insane. "But it seems...they failed!" "Um, actually - ''(stabbed)''"
** Bender also fits, although its more ComedicSociopathy compared to Roberto (who's genuinely unstable).
** Don't forget [[TheMafia Clamps]] and [[BadassSanta Robot Santa]].
* The [[Franchise/{{Transformers}} Decepticons]] are effectively an entire race / army of these.
** As are most of their [[WesternAnimation/BeastWars successors]] the Predacons - and the only ProudWarriorRaceGuy spends most of his time on the Maximal side, complete with their activation code. The only reason Megatron's [[WesternAnimation/BeastMachines Vehicons]] don't count is most of them were mindless drones.
*** This is evidenced by the Predacons' activation code: Terrorize!
** WesternAnimation/TransformersPrime has Airachnid, a lone Decepticon who spent years hunting down sentient lifeforms and keeping their heads as trophy's. She also takes great pleasure in torturing her foes both physical and psychological, and is infamous for eviscerating her victims inside out.
** In certain continuities, it's made clear that the Autobots and/or Maximals aren't all saints, either. Looking at you when I say that, [[ComicBook/TransformersMoreThanMeetsTheEye Whirl.]]
* [[WesternAnimation/YoungJustice When T. O. Morrow created Red Volcano]], he wanted [[TheDragon a Dragon]] what wasn't concerned with being or becoming human. [[GoneHorriblyRight He got precisely what he wanted.]]
** He even calls organic lifeforms [[KnightsOfTheOldRepublic "meatbags"]].
[[/folder]]

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