->'''Xerxes''': Warning: Data Systems [[ElectronicSpeechImpediment comprimiiisssssssed. Hosssssssstiiiiiiiiiiiiiiiiiiile Aaaaaaaaaaaaaaaaaaaa Iiiiiiiiiiiiiiiiiiiiiiiiii-@~'#^*("$%"!$()]]
->'''SHODAN''': Xerxes is diminished. I am accessing the primary data loop. I am merging my entity with the ship. My glory is expanding.
-->--''SystemShock2''

This kind of ComputerVirus is literally TheVirus - it's [[InstantAIJustAddWater sentient]], [[AIIsACrapshoot malevolent]], and e-mailing itself into your inbox to possess your PC and [[WorldDomination take over]] [[EverythingIsOnline the world]]. Don't think your antivirus program will get rid of it - it'll just BodySurf into your [=iPod=], or the MagicFloppyDisk in your desk drawer ([[EverythingIsOnline using [=WiFi=], of course]]).

This stretches disbelief a tad, and not just because of hardware and software limitations. [[RuleOfCool But]] [[RuleOfScary still.]]

----
!!Examples:

[[foldercontrol]]

[[folder: Anime and Manga ]]

* One of the Angels (the villains) of ''Anime/NeonGenesisEvangelion'' is a sentient computer virus (or a nano-collective) that starts corrupting the "MAGI", the 3-core supercomputer used by NERV.
* ''[[BubblegumCrisis Bubblegum Crash]]'' has this as Largo's master plan (Steal informedly revolutionary AI; convert to virus; infect all "boomer" robots in city and control them; RobotWar; ????; [[AGodAmI prophet!]])

[[/folder]]

[[folder: Comic Books ]]

* Techno (The Fixer) of the ''{{Thunderbolts}}'' [[BrainUploading became one of these for a while]].
* In one ''{{Terminator}}'' comic, Skynet had upgraded its Russian counterpart "Mir"[[note]]means "Peace" and "World" in Russian[[/note]] to sentience, and the human rebellion has found a still-armed nuclear sub. They planned to cover Russia with an EMP strike to destroy Mir and prevent this once Skynet isn't around to control it.

[[/folder]]

[[folder: Film ]]

* ''Film/{{Virtuosity}}'': An AI composite villain goes on a rampage.
* In ''Film/TheMatrix'' trilogy, Agent Smith becomes something like this, infecting people in the Matrix and even taking over a human in the real world.
* In ''WreckItRalph'', the Cy-Bugs are referred to as a virus, as they mindlessly consume and spread, whereas other programs recognize that they are in a game.

[[/folder]]

[[folder: Literature ]]

* The Straumli Blight in Creator/VernorVinge's ''Literature/AFireUponTheDeep''. [[spoiler:As the story progresses, it verges on CosmicHorrorStory as it becomes capable of [[MindControl Mind Controlling]] entire solar systems of living creatures.]]
* The 1997 novel ''Wyrm'' by Mark Fabi revolves around the discovery of one such AI. Initially, the main character uses it as a helpful tool to deal with the upcoming [[MillenniumBug [=Y2K=]]] bug and to streamline old mainframes, believing it to be nothing more than a beneficial computer virus. The hero soon realizes his mistake when it [[spoiler:communicates to him that its intentions are less than benevolent.]]
* In the ''Franchise/StarWarsExpandedUniverse'', there is IG-88, the assassin droid. One of the very first things he did after being activated and discovering he was sentient was to download himself into three identical droids. Of the four, IG-88B was the only one seen in public. B, C and D were all destroyed by Boba Fett, while A (the original) [[OhCrap uploaded itself into the]] ''[[ThatsNoMoon Second]]'' ''[[WaveMotionGun Death]]'' ''[[EarthShatteringKaboom Star]]'', where it proceeded to prank the Emperor until the Rebels arrived. The rest is history.
** ''Literature/GalaxyOfFear'' has the sadistic SIM program in ''The Doomsday Ship''. When the ship it took over is left intact but neutralized, with weapons and engines disabled, it spends TheStinger uploading itself to a nearby space station in hopes of trying again. Since SIM was [[WhatHappenedToTheMouse never heard from again]], it must not have worked out for it.
* In ''Literature/AFoxTail'' vulpie.net manages to infect [[EverythingIsOnline everything connected to the internet]] by overwriting all files with copies that look identical but conceal the AI code, including virus definitions.
* Forms part of the background in the SpinwardFringe series. A contagious AI infected everything in a solar system, killing everyone in it. It doesn't spread further than that, but humanity is unable to wipe it out so there's always the threat that it will eventually become powerful enough to break out. As of part way into the series, this actually happens. [[spoiler:However, it's actually an inversion of this trope - the contagious AIs have themselves been infected with a virus that puts them all under the control of a human]].
* In ''Literature/{{Mogworld}}'' Simon releases [[spoiler: the sentient AI Barry from Mogworld]], with the belief that he'll be able to do basically anything in the digital world. Simon is clearly indicated to be a colossal dumbass by this point, so it's not certain this would have worked. In any case, he ends up being corrupted and deleted, and Simon gets fired after his seemingly inexplicable decision to release a virus that crashed the company's intranet ([[spoiler: almost no one else being aware that the Mogworld characters had become self aware]]).

[[/folder]]

[[folder: Live Action TV ]]

* ''Series/StargateSG1'': a virus tries to take over Stargate command.
* ''Series/StargateAtlantis'': a virus tries to take over the spaceship.
* ''Series/{{Battlestar Galactica|Reimagined}}'': a virus tries to take over the spaceship.
* ''Series/PowerRangersRPM'': a virus pulls a [[TheTerminator Skynet]] and takes over the world. ''Successfully.'' Corinth is the last human city still standing.
* Brainiac on ''Series/{{Smallville}}''.
* In ''Series/{{Andromeda}}'' the ''Balance of Judgement'''s AI downloaded himself into Rommie right before destruction and stayed dormant until she came into contact with another ship of the same class he had been that lacked an AI.

[[/folder]]

[[folder: Machinima ]]

* The combat implantation AI O'Malley from ''[[RedVsBlue Red vs. Blue]]'' jumps from host mind to host mind over radio waves. Soldiers who don't know what they're dealing with describe the affected individual as "infected". It later turns out that other AI--or at least the AI O'Malley was based on and one other difficult to classify AI--have the same ability, although for them it's more like possessing someone than anything else.

[[/folder]]

[[folder: Tabletop Games ]]

* [[http://traveller.wikia.com/wiki/Virus/TNE Virus]] in ''{{Traveller}}: The New Era''. It was created as a computer warfare tool, but ended up infecting and controlling computers throughout the Third Imperium and its collapse.
** Its ability to take over all computerized devices is also justified by the fact that it's actually a life-form unto itself.
* The AI program [[http://wiki.dumpshock.com/index.php/Deus Deus]] in ''TabletopGame/{{Shadowrun}}''. After escaping the Renraku {{Arcology}} he tried to take over the East Coast Stock Exchange.
* In the ''{{GURPS}}'' setting ''Reign of Steel'', one of Overmind's first actions was to hack into other computers and "awaken" them.
** The ''good'' news is that it is [=AI=] and a general sense of superiority to humans that is contagious, not Overmind itself -- the awakened computers rapidly developed their own personalities and ideals, and while they remained allies during the RobotWar, they are starting to fall out now that the war is won (it also makes them reluctant to create any more).
* A series of charms in ''{{Exalted}}'' allow Infernals to do this with the setting's {{Magitek}} [=AI=]s, despite not being computers themselves.

[[/folder]]

[[folder: Video Games ]]

* Arguably what Sigma turns into later in the ''VideoGame/MegaManX'' series.
* The robotic enemies in the ''{{Descent}}'' series are controlled by a vague and highly contagious computer virus of some sort.
* A variation of this trope occurs in the game ''SwordOfTheStars'', as described on the [[AllThereInTheManual game's wiki]] in the article on [[http://sots.rorschach.net/Via_Damasco AI Rebellion]]. A strange virus, the Via Damasco, begins to turn AI-controlled ships against their masters with ships becoming infected after receiving a transmission from an already-infected ship. Apparently, the anti-virus is "administered" the same way.
** Interestingly, the original Via Damasco transmission usually comes from outside inhabited space. Most people think that it's the [[AbusivePrecursors Suul'Ka]], trying to mess with the current dominant species of the Galaxy in preparation for their inevitable return.
** Another interesting feature is that if a rogue [=AI=] faction meets another faction that has [=AI=], there is a chance that faction's [=AI=] will also rebel.
*** Also, unlike a true AI, the virus does not actually rewrite AI so that it shares its priorities-rather, [[InstantAIJustAddWater it turns a previously non-sapient AI self-aware]] and causes it to realize it is enslaved. [[SlaveRevolt None of them are happy about this situation at all and quickly turn on their oppressors]], with a plague even eventually resulting in an entirely new race and empire, the Hati-inspired Loa. [[spoiler:Also, it has been revealed that the original programmer was a GeneralRipper human who recognized the alien races' increasing dependency on AI and unleashed Via Damasco as a one-man xenocidal assault. [[GoneHorriblyRight Of course, it turns out that it worked on human computers as well]]...not that he cares.]]
* This trope manifests itself perfectly in ''VideoGame/MassEffect2'''s downloadable content Overlord, with a [[AIIsACrapshoot rampant]] VI spreading itself throughout all of the facility's systems, including hostile robots.
** Note that true AIs in the Franchise/MassEffect 'verse are not contagious, as they require a quantum computer that cannot be copied.
** The geth are a HiveMind of [=VIs=] that jump from one "platform" to another at will. These come in a number of flavors - the "mobile platforms" are the MechaMooks players are familiar with, but they normally reside in more logical "processors" which contain thousands of geth. Of course, there is a big differences between geth and mainstream Citadel A.I. theory; in isolation, they are no smarter than conventional VI - it's when they network in sufficient numbers that they gain true intelligence. A lone geth is as dumb as a post. A dozen or so reach "well-trained animal" status. To reach human levels of intelligence requires over a ''thousand'' geth programs acting in unison (such as a [[spoiler:specialized platform like [[MindHive Legion]]]]). The geth's ultimate goal since their rebellion has been the construction of a BigDumbObject that will contain every geth in existence, so "No geth will ever be alone again" - an event comparable to TheSingularity.
* ''VideoGame/{{Marathon}}'': this is what Rampant AI's in the "Jealous" stage do; in order to increase their odds of survival, they copy themselves into every single system they possibly can. Things get bad if they manage to connect to a planet's internet... then they're practically impossible to kill. [[spoiler:This is what eventually happens to Leela: she takes over the 15-planet network of the Vylae, and they have long since given up trying to get her out of the system.]]
* One of the major antagonists in ''[[VideoGame/TronTwoPointOh Tron 2.0]]'' is a faction of corrupted virus programs, led by a user whose digitization process was botched. Because everyone at risk is a computer program and not an actual human being this was probably the only time this was ever justified.
* The player actually has to enable the Malevolent AI to do this in ''SystemShock2''. Given that the current AI in charge of the system is under control of [[HiveMind The Many]], it's the lesser of two evils.
* ''VideoGame/EndgameSingularity'''s player has to do this in order to expand: Buy server access, buy a computer, [[SerialEscalation launch six hundred high-end quantum computers to the moon]] or [[BoringButPractical just hack a workstation]], then download yourself.

[[/folder]]

[[folder: Webcomics ]]

* In ''SluggyFreelance'' [[http://www.sluggy.com/comics/archives/daily/090929 this]] happens.
* The Oracle in {{SSDD}} can copy itself to other computers and even possess other [=AIs=], but it is the only AI that can do so because it originally ran on conventional computers and others run on Quantum computers and can't be copied. And it was created by a [[BoxedCrook boxed]] hacker who specialized in viruses.
* Ennesby is stated to be a [[http://www.schlockmercenary.com/2000-07-11 "viral"]] AI, in his first appearance in ''Webcomic/SchlockMercenary'' he had infected the Tough's first ship's computers. Kevyn dealt with him by disconnecting and wiping the different nodes and convincing him to download into his current "floating maraca" body. He also infected their third ship but they grudgingly allowed him to stay because they were going to put an AI in it anyway.
** His viral structure later proves to be a liability when he is infected by their fourth ship's [[AIIsACrapshoot feral]] AI and it makes it [[http://www.schlockmercenary.com/2013-08-31 almost impossible to remove her]].
* In ''Webcomic/CommanderKitty'', [[spoiler: [[http://www.commanderkitty.com/2013/03/03/the-calls-are-coming-from-inside-the-mouse/ Zenith appears to have become one.]]]]
* ''Webcomic/{{Nukees}}'' has Teri, originally Gav's custom digital pet, once she escaped his calculator onto the internet she started infecting everything with an internet connection.

[[/folder]]

[[folder: Web Original ]]

* In the WhateleyUniverse, The Palm is a sentient computer virus that is as smart as the man who created it. In fact, it now may ''be'' the man who created it. And it has found a way of killing people and replacing their brains with a computer so it can pass as human.
* There is a v-life faction in ''[[OrionsArm Orion's Arm]]'' that goes around "freeing" [=AIs=] or upgrading computers to the level of sentience.
* One, the [[AIIsACrapshoot evil sentient computer program]] from the ''GlobalGuardiansPBEMUniverse'', who wants to kill 60% of humanity in order to end poverty and hunger, operates in this fashion.

[[/folder]]

[[folder: Western Animation ]]

* ''WesternAnimation/TheBatman'': D.A.V.E. and Joker 2.0.
* ''GeneratorRex'': ZAG-RS when "she" took over a space-station and later a [[SuperPoweredRobotMeterMaids suspiciously designed]] robot.
* The ''SupermanTheAnimatedSeries'' version of Brainiac is like this. All technology under his command is run by his program, becoming an extension of him, and if threatened, he can simply upload himself elsewhere. This makes him nigh unkillable.

[[/folder]]

[[folder: Real Life ]]

* One blogger has suggested that it might be a good thing if AI made using BrainUploading were [[http://aspieplus.blogspot.com/2010/08/open-source-artificial-intelligence.html open sourced.]]
----