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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HALF-LIFE

Half-Life

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.

Chapter 0: Hazard Course
Chapter 1: Black Mesa Inbound
Chapter 2: Anomalous Materials
Chapter 3: Unforeseen Consequences
Chapter 4: Office Complex
Chapter 5: "We've Got Hostiles!"
Chapter 6: Blast Pit
Chapter 7: Power Up
Chapter 8: On A Rail
Chapter 9: Apprehension
Chapter 10: Residue Processing
Chapter 11: Questionable Ethics
Chapter 12: Surface Tension
Chapter 13: "Forget About Freeman!"
Chapter 14: Lambda Core
Chapter 15: Xen
Chapter 16: Gonarch's Lair
Chapter 17: Interloper
Chapter 18: Nihilanth
Chapter 19: Endgame

Opposing Force

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.

Chapter 0: Boot Camp
Chapter 1: Incoming
Chapter 2: Welcome to Black Mesa
Chapter 3: "We Are Pulling Out!"
Chapter 4: Missing in Action
Chapter 5: Friendly Fire
Chapter 6: We Are Not Alone
Chapter 7: Crush Depth
Chapter 8: Vicarious Reality
Chapter 9: Pit Worm's Nest
Chapter 10: Foxtrot Uniform
Chapter 11: The Package
Chapter 12: Worlds Collide
Chapter 13: Conclusion

Blue Shift

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.

Chapter 0: Hazard Course
Chapter 1: Living Quarters Outbound
Chapter 2: Insecurity
Chapter 3: Duty Calls
Chapter 4: Captive Freight
Chapter 5: Focal Point
Chapter 6: Power Struggle
Chapter 7: A Leap of Faith
Chapter 8: Deliverance

Decay

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.

Chapter 1: Duel Access
Chapter 2: Hazardous Course
Chapter 3: Surface Call
Chapter 4: Resonance
Chapter 5: Domestic Violence
Chapter 6: Code Green
Chapter 7: Crossfire
Chapter 8: Intensity
Chapter 9: Rift
Bonus Chapter: Xen Attacks

Half-Life 2

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.

Chapter 1: Point Insertion
Chapter 2: "A Red Letter Day"
Chapter 3: Route Kanal
Chapter 4: Water Hazard
Chapter 5: Black Mesa East
Chapter 6: 'We Don't Go To Ravenholm...'
Chapter 7: Highway 17
Chapter 8: Sandtraps
Chapter 9a: Nova Prospekt
Chapter 9b: Entanglement
Chapter 10: Anticitizen One
Chapter 11: 'Follow Freeman!'
Chapter 12: Our Benefactors
Chapter 13: Dark Energy

Episode One

In Episode One, the player continues the role of Gordon Freeman as he moves to escape City 17 before the Citadel's destruction.

Chapter 1: Undue Alarm
Chapter 2: Direct Intervention
Chapter 3: Lowlife
Chapter 4: Urban Flight
Chapter 5: Exit 17

Episode Two

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.

Chapter 1: To the White Forest
Chapter 2: This Vortal Coil
Chapter 3: Freeman Pontifex
Chapter 4: Riding Shotgun
Chapter 5: Under the Radar
Chapter 6: Our Mutual Fiend
Chapter 7: T-Minus One

Half-Life: Alyx

In Half-Life: Alyx, the player takes on the role of Alyx Vance, a supporting character in the Half-Life 2 series. The game, which is designed around being played in Virtual Reality, sends Alyx through a Combine Quarantine Zone to rescue her father, and then to investigate a mysterious vault that seems to contain some sort of weapon that the Combine is afraid of.

Chapter 1: Entanglement
Chapter 2: The Quarantine Zone
Chapter 3: Is Or Will Be
Chapter 4: Superweapon
Chapter 5: The Northern Star
Chapter 6: Arms Race
Chapter 7: Jeff
Chapter 8: Captivity
Chapter 9: Revelations
Chapter 10: Breaking And Entering
Chapter 11: Point Extraction

PORTAL

Portal

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."

Part 1: The Test Chambers
Part 2: Escape
Part 3: Central AI Chamber
Part 4: Credits

Portal 2

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.

Chapter 0: Prologue
Chapter 1: The Courtesy Call
Chapter 2: The Cold Boot
Chapter 3: The Return
Chapter 4: The Surprise
Chapter 5: The Escape
Chapter 6: The Fall
Chapter 7: The Reunion
Chapter 8: The Itch
Chapter 9: The Part Where He Kills You
Chapter 10: The Credits

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.

Chapter 1: Calibration Course
Chapter 2: Team Building
Chapter 3: Mass and Velocity
Chapter 4: Hard Light Surfaces
Chapter 5: Excursion Funnels
Chapter 6: Mobility Gels
Bonus Chapter: Art Therapy

Recap / Half-Life

HALF-LIFE

Half-Life 2

Half-Life: Alyx

PORTAL

Portal 2

Alternative Title(s): Half Life Alyx

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Recap / Half-Life

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HALF-LIFE

Half-Life 2

Half-Life: Alyx

PORTAL

Portal 2

Alternative Title(s): Half Life Alyx

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