Chell and PotatOS land in the abandoned 1950s-era labs. As they climb back up through the decades (the 60s, 70s, and 80s), they hear pre-recorded messages from Aperture’s founder, .

They return to the modern facility to find Wheatley has made a complete mess of things, pushing the reactor toward a core meltdown. In the final battle, Wheatley booby-traps the room, but Chell notices the roof has been torn open, revealing the night sky.

Watch these recaps to see the story of Portal 2 in action: Portal 2 In 6 Minutes YouTube · Northern Bob Portal 2 (Story Condensed) YouTube · haybe The Story of Portal 2 in 5 Minutes YouTube · Timmy Boots