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.
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
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
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
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
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
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
- 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
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
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