GLaDOS

The overseeing mind of Aperture Science, GLaDOS is designed for testing of all kinds. Even the deadly kind. Especially the deadly kind. Originally based on the mind of temporary CEO of Aperture Caroline, GLaDOS was made aware of her new life. And then she killed everyone. And kept killing those left behind in testing with her increasingly dangerous experiments. But a lone young woman named Chell threatens everything with her wit and persistence, something the mocking AI cannot condone....not for long, at least.