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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