10 Most Evil A.I. In Video Game History

5. GLaDOS - Portal

I almost didn’t include GLaDOS here because she’s so darn charming despite being undeniably full-on evil that it felt cruel to jam her in between the big bads of Terminator and Fallout 3, but it would be equally unsuitable to leave her out.

For the uninitiated, GLaDOS or Genetic Lifeform and Disk Operating System is a smart-talking, torture-loving, sadistic AI that runs the now decidedly empty Aperture Science facility. She leads you through each of Portal’s chambers, mostly making fun of you, getting annoyed at your successes and ultimately trying to stop you from escaping the facility so she can continue to toy with you.

She also serves up some cake-related gaslighting which is kind of the worst part of all.

Still, we can’t be too mad at her even if she is out-and-out evil. She was dealt a pretty rough hand and her dialogue and delivery is just delightful. Even if most of what she has to say to Chell are insults.