After defeating the alien leader Nihilanth, you, Gordon Freeman, declined the mysterious G-Man’s offer of employment and narrowly escaped death at the hands of several alien grunts.

After battling your way through the Lambda Reactor Complex and realigning the antenna dish you were able to make contact with the outside world.

Word has spread of the strange events at Black Mesa and the government is attempting to coverup the truth by reporting “a terrorist plot to obtain U.S. military secrets has been uncovered at the Black Mesa Complex. An undetermined number of civilian personnel have been killed in the well-organised terrorist raid which has been met by U.S. rapid-deployment forces.”