You're an Aperture Employee named Fredrick Williams, and GLaDOS thinks you've been slacking off, now, GLaDOS being as sadistic as they come, instead of firing you or lowering your paycheck, she throws you into an elevator taking you to a chamber you've nev...

The elevator took you to some storage room, but back when you were an employee you remembered that there was a test chamber nearby this room....

The elevator has tooken you up to the offices, you feel nostalgic just looking at the offices, although everyone has left and they set up a few traps just before leaving....

Just as you thought the elevator would take you up to the surface, the power goes out and the elevator falls down to the bottom floor, the sewers, you were knocked unconcious by the fall and don't know where you are....

The elevator has tooken you up to a test chamber, after this should be the main lobby, although little did you know they filled the main lobby with turrets....