Editing Half-Life (section)

==Story==
{{Spoilers}}

The game starts off with Gordon Freeman arriving late to his job at the Anomalous Materials Laboratory via the facilities tram transportation system. At the lab, the science team is being hard-pressed by the Administrator to get results with a rare, unusually pure crystal sample. They decide to push their equipment as hard as they can, but this decision proves to be disastrous as a resonance cascade rocks the facility; alien fauna then begins to randomly teleport in and around the ''Black Mesa Research Facility''. Gordon, who was wearing a Mark IV HEV (''Hazardous Environment Suit'') at the time of the cascade, managed to survive after getting a brief glimpse of the alien world.

Gordon wakes up a short time later to find the ''Black Mesa Research Facility'' in ruins, and begins his journey to the surface to call for help; all while being watched by a mysterious man in a blue suit wandering the facility. Eventually, Gordon learns that the Military has been called to the facility, making reaching the surface even more imperative. However, upon reaching the surface, Gordon finds that the military is not there to conduct a rescue; they're under orders to silence the facility and cover up the incident. Unable to escape, Gordon is forced deeper into the ''Black Mesa Research Facility'', where he is conscripted by his fellow scientists. They tell him to head to the ''Lambda Complex'' on the other side of the research facility, where they are attempting to stop the catastrophe.

On his way, Gordon manages to launch an important rocket before eventually getting captured. Gordon is left for dead in a garbage compactor, but escapes and continues his journey to the ''Lambda Labs'' complex, only to discover a lab where the alien creatures are locked up, under close observation; and they look to have been there prior to the ''Resonance Cascade''. Gordon continues traveling across the facility on foot, fighting military soldiers and an increasingly hostile alien force. It becomes obvious that the aliens are no longer just randomly teleporting animals, but are in fact a focused alien invasion force, complete with soldiers.

As he reaches the ''Lambda'' complex, Gordon discovers that the military is pulling out, and resorting to bombing the ''Black Mesa Research Facility'', making it imperative that Gordon reach the Lambda team. As he fights into the facility, he makes another alarming discovery: not only was the ''Black Mesa Research Facility'' studying the alien creatures, they were also experimenting with teleportation, and bringing the creatures directly from their homeworld in another dimension. Gordon fights back an army of alien soldiers to reach the tip of the Lambda reactor where he finds the Lambda team holed up in a supply room. The Lambda team informs Gordon of an immense being keeping the portal to Earth open, and that killing it is the only way to close the inter-dimensional rift. They power up the generator, prep Gordon with a special ''Long Jump Module'', and send him to the strange dimension of ''Xen''. Gordon then fights his way through the alien wildlife, past mining camps and even to the heart of an alien factory mass-producing the soldiers Gordon fought on Earth.

Gordon finally reaches this immense being, known as ''Nihilanth'', who draws power from strange massive crystals, that are similar in appearance to the pure sample that originally started the ''Resonance Cascade'' on Earth. Gordon destroys the three crystals on the walls, starving ''Nihilanth'' of power, and then manages to destroy ''Nihilanth'' itself. Upon his death, tendrils of energy shoot from ''Nihilanth{{'}}s'' head, similar to the resonance cascade the player experienced at the start of the game, and Gordon is once again teleported into darkness.

As Gordon comes to, he's face-to-face with the mysterious man in blue that he saw wandering through the facility. The man congratulates Gordon on his success, stating that he has done a fantastic job, and that his employers want him to offer Gordon a job. The man then opens a portal, and gives Gordon an ultimatum; join him and enter through the portal, or face a "battle he has no chance of winning".

Gordon accepts, much to the mysterious man in blue's delight. The man informs Gordon that he'll see him "up ahead", and the credits roll.