Meet Gordon Freeman, a lowly scientist working at the secretive Black Mesa research facility. He's about to become involved in an experiment that will go monumentally wrong, causing hordes of mysterious alien creatures to start appearing from thin air, and sparking a major battle between the local Marines and the newly arrived extra-terrestrial visitors. Gordon may be a mild-mannered research scientist, but when you're stuck between a bunch of obviously hostile aliens and an equally hostile group of trained killers with orders to shoot on sight, there's only one available option - grab the nearest weapon to hand and try to stay alive.
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