This article will consolidate the recaps for all the games in Valve's Half-Life universe.Spoiler alert: This page contains unmarked plot spoilers. Read at your own risk.
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In Half-Life, the player takes on the role of Gordon Freeman, a theoretical physicist employed in the Anomalous Materials lab at the Black Mesa Research Facility.
In Opposing Force, the player takes on the role of Adrian Shepard, a United States marine corporal of Black Mesa's Hazardous Environment Combat Unit.
In Blue Shift, the player takes on the role of Barney Calhoun, a mid-ranking security guard of Black Mesa, who is responsible for the preservation of equipment, and the welfare of research personnel.
In Decay, the player takes on the roles of two Black Mesa employees assigned to the Anomalous Materials lab; the senior physicist, Gina Cross, and her colleague, Colette Green.
In Half-Life 2, the player returns as the theoretical physicist, Gordon Freeman, a former Black Mesa employee who's been awoken out of indefinite stasis into Earth's City 17; a world now under the control of an alien race.
In Episode One, the player continues the role of Gordon Freeman as he moves to escape City 17 before the Citadel's destruction.
In Episode Two, the player continues the role of Gordon Freeman as he fights his way through dense forestry to reach the resistance stronghold, White Forest.
In Portal, the player takes on the role of Chell, a test subject of the Aperture Science Research Facility who is tasked by the artificial-intelligence, GLaDOS, to take part in a series of tests revolving around the use of the "Portal Gun."
In Portal 2, the player returns as the Aperture Science test subject, Chell, who has awoken from stasis, and is forced by the newly awakened GLaDOS to solve a new variety of tests.
Portal 2 Co-op
In Portal 2 Co-op, two players take on the roles of Atlas and P-body, artificial-intelligence robots, who are built and tasked by GLaDOS to carry out a series of tests that require the cooperation between the two robots to pass each challenge.