APERTURE'S HOUR fills the gap between Portal & Half-Life by giving a look at Aperture Laboratories during the Black Mesa Incident and the resulting Seven Hour War. Taking the role of an employee stuck in a testing cycle following GLaDOS' complete takeover on Bring Your Daughter to Work Day, make your way through and escape the now malfunctioning facility.
Pretty much like it says on the tin, a work in progress intro test.
The Nine Inch Nails track was placeholder, it seemed to fit so I kept it until I made a replacement.
EDIT: moddb seems to have stretched the video, ah well.