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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."
A psychopath who's also a robot
. Compare A.I. Is a Crapshoot
where the robot isn't intended to be evil. Expect a lot of Crush. Kill. Destroy!
. If they happen to be a good guy (or at least working for the good guy), they'll probably be a Sociopathic Hero
See Second Law My Ass
for a milder form of this behavior.
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Anime and Manga
- Red Destiny in The Big O.
- The Androids from Dragon Ball and Dragon Ball Z were intended by their creator(s) to be these, but almost all of them ended up turning good, the main exceptions being the ones in Future Trunks's timeline / dimension. And those Androids are actually humans altered by Doctor Gero.
- 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 Digimon Adventure. Despite his Creepy Monotone voice, he's a psychopathic monster who takes sadistic pleasure in destroying everything in his path.
- Death's Head
- The Avengers' Arch-enemy Ultron.
- Most incarnations of the Superman villain Brainiac.
- Judge Dredd'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.
- X-Men 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. This is a stark contrast to before Nimrod was fused into Master Mold, as Nimrod had a decent enough personality despite being programmed for mutant genocide, and genuinely cared about protecting ordinary humans...which confused it because it wasn't supposed to have a personality at all.
- The Terminators. Or at least all the ones that haven't been reprogrammed.
- In The Sarah Connor Chronicles, 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 RoboCop (1987). Being the brain child of a Corrupt Corporate Executive, it's unclear how much of it is a design flaw versus intentional programming.
- Dick Jones himself tries to invoke this trope when RoboCop comes to arrest him at the end of the movie. "This is absurd! That thing is a violent mechanical psychopath!" It doesn't work.
- The Showa (original) Mechagodzilla was a Humongous Mecha Killer Robot 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 Tin-Can Robot.
- Maximillian in The Black Hole was not only murderous, but creepy as all hell, too. That red cyclopian eye, those drill arms, its hovering frame, its implacable ominous hum, and the way it never ever speaks (or anything else even remotely human, for that matter).
- The Culture designs their warships this way because it makes them more efficient killers. Drones in Special Circumstances share this trait. Even Drones who act like 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 mindraping tyrants and other evils and who even other Culture warships see as a psycho.
- Tik-Tok (not that one) by John Sladek. One day, he discovers that he isn't Three-Laws Compliant 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 Three-Laws Compliant, 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, 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 The Voyage of the Jerle Shannara, who is doing exactly what it was programmed to do: protect the books of knowledge, no matter who it has to kill to do so.
- Joe in Henry Kuttner's Robots Have No Tails is an early example, possibly the Trope Maker. 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 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 Played for Laughs.
- "Fondly Fahrenheit" by Alfred Bester has a lot of confusion about whether the robot is a murderous maniac, or its owner, or both.
Live Action TV
- Buffy the Vampire Slayer: Adam was built to be a weapon, and as such is incapable of caring about anyone.
- Brainiac in Smallville combines this trope with (alphabetically) Evil Genius, Grand Theft Me, Misanthrope Supreme, and Omnicidal Maniac. He was wired this way from the start by General Zod, who sought to use him as his Dragon; after Zod's defeat, Brainiac goes rogue and creates his own agenda for The End of the World as We Know It. 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 Knight Templar Big Brother meets this trope, with a nice dose of Body Horror and Hollywood Cyborg on the side.. Although they both Heel-Face Turn it is due to being reprogrammed, not altruism on their own part.
- Lore, Data's Evil Twin from Star Trek: The Next Generation.
- Almost Human 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 but this time it is under orders from its creator.
- Red Dwarf: In "Demons and Angels", Low Kryten is an evil mechanoid designed to hurt people. He tortures Lister along with the rest of his crewmates.
- HK-47 from Knights of the Old Republic, and his HK-50 knockoffs from the sequel.
- Cut content makes the HK-50s worse. HK-47 is proud of generally being a precision weapon that doesn't have to resort to wanton slaughter. The HK-50s refer to their function as wanton slaughter. As a result, HK-47 finds the very existence of the HK-50s deeply offensive.
- Possibly inspired by HK-47, PROXY, your Robot Buddy from The Force Unleashed, is programmed to try to kill you again and again. What makes him different from HK is that 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 Sonic the Hedgehog. The Bioware-made Chronicles lampshades the similarity to HK-47.
- To a more sinister extent, Metal Sonic, who was driven mad by constant losses.
Alpha 2 Abomination the Second, son of the great protector of Lamar from The Nameless Mod.
- Omega from Mega Man Zero personifies this trope almost as much as HK-47 does.
- R-110 from 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 Fallout: New Vegas' 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!
- Lisa from Phantasy Star Online 2.
- In the Visual Novel Bionic Heart, Tanya goes on a killing spree after she realizes that she was given the brain of a serial killer when the resident Mega Corp. illegally created her and other Artificial Humans from preserved brains in People Jars.
- Warmech in 8-Bit Theater.
- The Red Robot from Diesel Sweeties.
- Zeke in Ctrl+Alt+Del 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 Girl Genius.
- While not nearly as bad as some of the other examples on this page, you could make a very convincing case for Pintsize of Questionable Content to be here.
- Ping from MegaTokyo has a flaw in her programming which makes her become this in response to rejection. It proves useful against a giant monster.
- In Freefall, the ship positively hates Sam, and until talked to by Florence was trying to kill him. It now will settle for an occasional maiming.
- Vaporware from Checkerboard Nightmare, who later found his way into Starslip, embodies this trope by design. Not long after he was 'upgraded' to a benevolent AI, he was thrown into a sun.
- Roberto from Futurama. He claims that the engineers who created him wanted him to be criminally insane. "But it seems...they failed!" "Um, actually - (stabbed)"
- The Decepticons are effectively an entire race / army of these.
- As are most of their successors the Predacons - and the only Proud Warrior Race Guy spends most of his time on the Maximal side, complete with their activation code. The only reason Megatron's Vehicons don't count is most of them were mindless drones.
- This is evidenced by the Predacons' activation code: Terrorize!
- Transformers Prime 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, Whirl.
- When T. O. Morrow created Red Volcano, he wanted a Dragon what wasn't concerned with being or becoming human. He got precisely what he wanted.