At the end of Half-Life 2: Episode One, Gordon and Alyx have managed to delay the reactor of the Combine Citadel at the heart of City 17 from going critical long enough to evacuate the last group of civilians and members of the Resistance who survived the uprising in Half-Life 2. Alyx has also obtained data from the Citadel that could prove invaluable in defeating the Combine. Gordon and Alyx barely make it out of the city on the last train, when the Citadel’s reactor melts-down—turning it and City 17 into one huge, smoldering crater. The train carrying Gordon and Alyx is derailed from the shockwave of the explosion.
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