Chell comes back to Aperture not wanting to face the outside world while GLaDOS invests her time into the world of human emotions. With a back up of Caroline further studied, it's reveals the creation of something that will change both of their lives.

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…