When a magic powerful than Discords transports each of the 6 ponies they Aperture, they must learn to work at tests, each using a Portal gun. But a note appears, telling them "One of their friends will soon be the boss" but soon, the ponies start to worry about each another...who will be the 'boss' and how will it end? They soon wonder who it shall be, and meet a mysterious Grey friend on the way to the Control Unit to shut down the creature who tortures them, GLaDOS...more and more notes appear time by time...