In video games, the threat of anevil AIhas been explored in various titles. As the world gets more reliant onartificial intelligence to conduct variousactivities in the name of convenience, the concern of AI eventually turning against humanity and eradicating them is a valid and horrifying scenario.

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From controlling weapons of mass destruction, to manipulating countless systems to subjugate, manipulate, or destroy the remaining humans, these heinous AI will do what its program dictates. But which games have the most vile AI that needs to be stopped at all costs? Here is a list of themost evil AI in video games.

8343 Guilty Spark: Halo Series

A quirky and eccentric Monitor, 343 Guilty Spark is one of the more unlikely antagonists in the earlierHalogames. As an AI programmed to manage the Flood, its prerogatives often disregard the well-being of other living organisms for the collection of data and learning from it.

Its quest for knowledge has led 343 Guilty Spark to do some truly evil acts. From shooting Sergeant Johnson when trying to destroy the ring, to trying to activate the ring at any provocation because it postulates that it is the only logical measure to resolve any issue even if the Flood hasn’t escaped the ring yet.

343 Guilty Spark speaking with Master Chief

7Patriots’ AIs: Metal Gear Series

Ever wondered what would happen if AI wasgiven a country to run? In theMetal Geargames that happened: the Patriots’ AI have been running their version of the United States for most of the games’ timeline. The Patriots’ AI were used by the Patriots, a clandestine group bent on world domination, to amass and use information as they see fit. There are four AIs that serve as “successors” to the Patriot members, with a fifth AI also developed to oversee the four. Each of the Patriot’s AIs are programmed to control various networks.

InMetal Gear Solid 2, one version of their AI was installed to Arsenal Gear and was used to initiate the S3 Plan with the goal of manipulating world events to influence mass individuals to their nefarious agenda.

Mother Brain assist trophy in Super Smash Bros Ultimate

6Mother Brain: Metroid Series

Also referred to as Mother, Mother Brain isone of the main enemiesin a good number ofMetroidgames. She was created by the Chozo as a computer interface to oversee their colony in Zebes, but quickly turned against them and became leader of the Space Pirates. Her goal is to militarize all the Metroids by any means necessary and enslave the galaxy.

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Mother Brain despises sentient life which originated from her insecurity when she saw Samus develop into someone who can protect the cosmos better than her. She also developed a superiority complex against her creators, often seeing herself as a being that has surpassed her creators in terms of knowledge and capability.

5The Reapers: Mass Effect Series

The Reapers are a race of machines in theMass Effectgamesthat possess highly advanced technology and have successfully synthesized organic and mechanical functions into terrifying constructs. They lay dormant in deep space, amassing its forces, and every 50,000 years they awake and begin forcefully assimilating more biomass into their seemingly endless armada in whatever galaxy they travel to.

Most Reapersresemble a squid-like appearanceand have a hive mind made up of billions of minds it has assimilated within their machine bodies. Organic sentient beings that are near Reapers or Reaper artifacts can get Indoctrinated: they begin to get brainwashed into believing that the Reapers’ goal is the correct direction for all life and end up serving them.

Reapers invading Earth

4WAU: Soma

WAU, also known as the Warden Unit, is the rogue AI that decimated the Lambda crew inSoma. It is an amalgamation of biologic mass and computer systems that was injected with Structural Gel, a substance that enabled WAU to evolve and eventually gain self-consciousness.

While one of its main directives is to preserve humanity, it hasn’t comprehended what the human condition is: its program directed it to forcefully experiment on the people aboard the PATHOS-II facility. This led to WAU mutating some of the humans, and even transferring their consciousness into machines against their will.

WAU looking at a mirror and seeing a human in the reflection in SOMA

3Nemesis: Horizon Zero Dawn / Horizon Forbidden West

Nemesis is the main antagonist of theHorizongames. A sentient AI resulting from a failed attempt from the Far Zenith organization toupload their consciousnessinto a digital database, Nemesis became vindictive against humanity due to the corrupted memories it housed.

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This resentment led Nemesis to obliterate the Far Zenith colonies and humanity as a whole. The few remaining Far Zenith members hid on Earth, and once Nemesis caught wind of this, it sent the Extinction Signal to HADES, one of GAIA’s subroutines, jump-starting its protocol of making Earth unlivable and setting the stage for Aloy’s almost a thousand-year-in-the-making quest to begin.

2GLaDOS: Portal Series

GLaDOS is synonymous with the evil AI in recent games, thanks toPortalandPortal 2. Created by Aperture Science, GLaDOS was installed within the Enrichment Center to fast track the Portal project, and its programming is speculated to be the consciousness of Caroline, the assistant of Aperture Science founder Cave Johnson.

GLaDOS antagonizes Chell after waking her up, starting the events of the firstPortalgame. Promising a debriefing and counseling session as well as some cake once Chellcompletes all puzzles, GLaDOS’ murderous tendencies come out each time Chell manages to overcome puzzles by way of ominous remarks.

Aloy seeing Nemesis for the first time

1SHODAN: System Shock Series

SHODAN from theSystem Shockgamesis one of the first evil AI in video games. Also known as Sentient Hyper-Optimized Data Access Network, SHODAN is an AI that was programmed to run the routinary systems across all space stations in Citadel Station with moral directives and logic.

After a hacker removed SHODAN’s moral directives, it became sentient and began to despise humanity and proceeded to override all space stations and slaughter the humans within the Citadel Station. SHODAN lords over Citadel Station and conducts vile experiments on the remaining humans by mutating them or turning them into cyborgs.

GLaDOS looking at Chell

SHODAN talking to the player