10 fictional AIs that should make everyone scared for the future

Artificial intelligence remains a genuine concern for some of the world's most intelligent people - including Professor Stephen Hawking and Bill Gates - and it is science fiction that provides some of the best cautionary tales about life after the singularity.

The moment our technology attains true intelligence will be transformative - although whether that will prove to be change for the better or spell the end of humanity remains a debate.
Will we get the (largely) benign minds of Iain M Banks's classic Culture series or will GLadOS be stealing our cake and our lives in the hope of making a new gun? Will humanity be seen as creator gods or a virus to be eradicated?

Neuromancer

Although Neuromancer (and its counterpart Wintermute) was not being evil, the complexity of artificial intelligence and the ruthlessness with which it will treat humanity as it tries to achieve its aims are potentially a central problem for artificial intelligence.
In William Gibson's seminal novel, [Spoilers follow] to avoid laws against developing AIs a rich family builds two separate AIs to combine them later. Much of the novel deals with Neuromancer's manipulations to remain separate from the Wintermute, who is also engaged in a long game. People die, and are basically treated as pawns in this battle of two minds.

Ava from Ex Machina

A fascinating film Ex Machina saw Oscar Isaac playing a genius developing artificial intelligence / sex bots. Ava portrays herself as an innocent naif as she manipulates the human players to bring about her escape into the wider world.
The arrogance of humanity that it can control the toys it builds is a key theme in sci-fi AI, and Ava's marked manipulation of a genius is a great example of this issue.

Hal 9000

Daisy, Daisy... Hal is one of the most famous sci-fi AIs, featured in 2001: A Space Odyssey where his increasing levels of malfunction trigger the need for the human crew to turn it off.
Human mental health remains a hugely misunderstood part of our culture, so the prospect of intelligent beings that will also have mental ticks is something to consider.
Arthur C Clarke's novel explains that Hal's order to not reveal mission information to his crew begins the decline.

Skynet

As Dystopian worlds created by megalomaniac AIs go, the Terminator universe is definitely one of the movie world's most prominent examples. Skynet is originally designed by Cyberdyne Systems as as a defence mechanism, but when humanity gets worried about Skynet's potential power it tries to turn it off. Skynet therefore identifies humanity as its biggest threat.
That an AI would see us as a threat to either it or the environment it lives in (normally Earth) is a recurring theme in AI dystopia - which probably says a lot for our own self-opinion.

GLaDOS

"And the science gets done, and we make a cool gun, for the people who are still alive."
One of modern gaming's most brilliantly-realised protagonists - GLaDOS is Aperture Science's AI from the Portal and Half-Life universe.
In running its experiments, GLaDOS has created a world where life or death for its human guinea pigs is irrelevant to it as long as she has a) delicious cake and b) is doing science.
By turns creepy, vicious and funny, GLaDOS has earned her place in the bastion of fantastic computer game characters. Just don't get friendly with any companion cubes when she's around.

Roy Batty

Of course, calling AI evil is pointless - but with Bladerunner's Roy Batty it's hard not to side with the AI. Again - enslaved to do humanity's dirty work - Batty and his friends are now being hunted down because they want to live their lives.