Gordon regains his consciousness inside the destroyed Test Chamber, looking for a way out he notices the whole facility around him has received massive structural damage, most of the personnel is dead, and aliens begin to teleport into the facility. After being told that all phones are out, Gordon is requested by one of his colleagues to try to make it to the surface in order to acquire help.
Starting his journey, Gordon finds a Crowbar to help him get past obstacles, and since the Tram System is too damaged to work, to find a way out he must cross the Sector B Coolant Reserve Facility, now overrun with alien creatures, occasionally witnessing the mysterious suited man from earlier watching him from out-of-reach places, always walking off before Gordon can get to him.
