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Half-Life 2: Episode One (originally known as Half-Life 2: Aftermath) is the first instalment of the revolution series, or episodes, the second installation of the official Half-Life 2 series, and the fifth instalment in the Half-Life series. It was released on PlayStation 3 and Xbox 360 as part of The Orange Box.
Gordon Freeman and Alyx Vance must escape City 17 before the Combine Citadel's reactor goes critical and destroys the city, but first they must stabilize the reactor to buy sufficient time to escape. Along the way, they assist Barney Calhoun with his efforts to rescue some of City 17's other inhabitants.