After Caroline discovers her 'parents' to be Black Mesa spies, Doug Rattmann hides young Chell in Old Aperture before she's sealed off and presumed dead. Years later, she's back, and her resurfacing could lead to Aperture's downfall. A Portal prequel about what it truly takes to have a shot at redemption.

GLaDOS brings Wheatley out of space to keep her company. Through trial and error, their friendship grows into an undeniable connection that they might be able to call love. With that on their side, they can do just about anything - maybe even save the world. Cores only. You don't have to read the whole thing, just pick whatever chapter sounds good. Read it backward if you want.

"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.

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…