Someone else

GLaDOS has found old experiments that should be made to see how cores react in human bodies. When she has an intelligence damping sphere that almost blew up her facility, a maintenance core that helped a human escape and a testing core that disobeyed her orders that she wants to punish, she decides it is time to start testing.

~~

When Chell escaped Aperture she thought she was safe, but she soon discovered that the world she knew doesn't exist anymore. When she meets another woman who came from Aperture they decide to stick together to survive. But when they get a message from a female test subject that needs their help, will they go back into the place their worst nightmares originated from?