On May 16, 200-, in a government research facility deep within the Nevada desert, six people would have their lives forever changed by an experiment gone horribly wrong. The first–Dr. Gordon Freeman, the scientist who would unknowingly trigger the start of these bizarre events. The second–Barney Calhoun, an ordinary security guard. The third and fourth–Gina Cross and Colette Green, two of Freeman's co-workers who struggle to reverse the damage caused by the mysterious mineral sample they delivered. The fifth and sixth–Corporal Adrian Shephard, and his brother, Sergeant Mitchell Shephard, soldiers of the elite HECU unit of the US Marine Corps, sent into the ensuing chaos on a search-and-destroy mission. Little did these six know how their involvement would shape humanity's future.
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