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Half-Life 2: Episode One is the first in a series of games that reveal the aftermath of 
Half-Life 2 and launch a journey beyond City 17. It focuses on developing Alyx as a character.
Consciousness returns. Gordon and Alyx discover they've somehow escaped both the reactor explosion and the G-Man's malevolent grasp. Before they can ponder their miraculous survival, the crippled Citadel lurches back to life just long enough to initiate a self-destruct sequence. With Alyx at his side, Gordon must flee a city in chaos before the Citadel's final detonation turns City 17 into a toxic, mutant-infested crater.
Content
- Episode One (
episodic) - Source shared (
hl2) 
Source 2013 Singleplayer engine branch
Chapters
| Toggle chapters Half-Life 2: Episode One ChaptersToggle chapters |
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 Undue Alarm ep1_citadel_00
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 Direct Intervention ep1_citadel_03
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 Lowlife ep1_c17_00
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 Urban Flight ep1_c17_01
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 Exit 17 ep1_c17_05
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