Portal 2 storyline

This article describes the Portal 2 storyline, chapter by chapter.

Portal 2 almost directly follows the events of Portal from Chell's perspective, although being set hundreds of years after the events of Portal.

Prologue
The prologue is set fifty days after the events of Portal. Chell is reawakened by an unidentified announcer. Test subjects who have been in stasis for several months are expected to have minor mental problems, and hence Chell is given a rough physical and mental exercise.

The Courtesy Call
The first chapter is set hundreds of years after Portal. In unknown means, Chell wakes up and finds Wheatley. The original Portal chambers are introduced, sometimes with occasional remakes and serious damages. They are guided by the same announcer, using pre-recorded messages.

At the end, GLaDOS is reawakened and starts building new test chambers.

The Cold Boot
This and next two chapters are GLaDOS's new tests. They primarily include Thermal Discouragement Beams and Aerial Faith Plates.

The Surprise
Chell is given a "surprise" as hinted by GLaDOS. There is actually none.

Before, GLaDOS mentioned that there are two more test subjects with Chell's (unknown) last name, and that her birth parents do not love her.

The Escape
Before GLaDOS can murder Chell, she and Wheatley escape. They eventually disable GLaDOS's turret and neurotoxin manufacturing facilities. After that, GLaDOS's head is replaced with Wheatley, GLaDOS is installed into a potato and they make a fall towards the older areas of Aperture.

The Fall
This chapter features Chell going through earlier tests, when Aperture Laboratories were instead known as Aperture Science Innovators. She is guided by pre-recorded messages by Cave Johnson and occasionally, his assistant and likely wife, Caroline.

The chambers here involve the Repulsion Gel and the first design of boxes, buttons and switches.

The Reunion
At this time, the potato GLaDOS attaches to Chell and becomes a companion for the rest of the game. Newer, but not yet of Portal era, chambers are visited. They involve the other two (Propulsion and Conversion) gels.

The Itch
Chell and potato GLaDOS return to Aperture during the Portal 2 era, which is now owned by Wheatley. He has renamed the entire facility in honor of himself, put monitors showing him almost everywhere and made "Franken-cubes" with turret parts.

Chell and potato GLaDOS then go through Wheatley's tests. They are very uncreative, and noted to resemble those by beginner Portal mappers.

The Part Where He Kills You
After several tests, Wheatley finds the Cooperative Testing Initiative and decides to murder Chell and potato GLaDOS. They however escape.

The ending sequence involves Wheatley attempting to murder Chell and potato GLaDOS. He has watched Chell killing GLaDOS, and hence has made several points on guarding himself. However, Wheatley's plan is still fallacious, and Chell stuffs three cores into Wheatley. Then his head is replaced by GLaDOS's and Wheatley himself is shot into space.

The Credits
GLaDOS tells Chell that "being Caroline" taught her a valuable lesson. She originally considered killing Chell for what she has done to her, but instead decides to transport her outside of Aperture and demands that she "never return".

The end credits feature another song by GLaDOS, Want You Gone, and a cinematic where Wheatley wants to apologize to Chell.

Co-op campaign
The co-op campaign is set after the single player campaign of Portal.