The Aperture lost is a continue of Chell's Story after GlaDOS turned off by Wheatley on Space, and Helper is yuri. Yuri is a core like wheatley but is deferent then him, Yuri is a friend not enemy, the objective is turn on GlaDOS The Aperture Sience whitout GlaDOS will Cause the Problems in Repairing the lost Test Chambers
It is the first Cinematic Video about Portal2:ApertureLost