"I've been working on a present for you. Well, 'technically' it's more of a medical experiment." After being released from the confines of Aperture, Chell is reminded that omniscient AIs rarely forgive. But they never forget.

Chell is finally free, but as she discovers, it's almost as difficult to survive on the surface. What will she do when her need to recover her memories drives her to return to Aperture? It won't exactly be a warm welcome, and there will be a few bumps along the road. Chell and GLaDOS friendship, ChellDOS eventually, but it'll be realistic in development.

A perfectly innocent and entirely human woman turns up at the house Chell has been living in since she escaped Aperture. Chell/GlaDOS.

Meteors, signals, apologies, and that tricky little thing called humanity- four years after the events of Portal II, Wheatley's been handed a second chance, but it's not going to be plain sailing…

The surface world isn't as wonderful as Chell had anticipated when she stepped out of that lift. But sometimes ending up back where you started isn't the worst thing that can happen. A story about fate, forgiveness, and sacrifices.

In which a debt is repaid, and a bigger story is hinted at. I am sorry, I suck at description.

Chell leaves the wreckage of Aperture Science behind to explore the remnants of human civilization. Along for the ride, GLaDOS learns that the only thing more perplexing than a test subject who refuses to speak is a conscience who won't keep quiet.

A conversation with someone about why they can't talk is bound to be a little one-sided, but GlaDOS is willing to try. Spoilers for Portal 2.