Half-Life 2: Episode One

Half-Life 2: Episode One (originally Half-Life 2: Aftermath) is the first in a series of three episodes charting the aftermath of the events in Half-Life 2. Episode One takes place in and around City 17, and it's only at the end of the episode where you finally leave City 17 for the first time; a journey which continues in Half-Life 2: Episode Two.

Episode One was released with Half-Life Deathmatch: Source, and is typically bundled with Half-Life 2: Deathmatch. It's also available as part of The Orange Box for Windows, Steam, Xbox 360 and the PlayStation 3, and also as a standalone release for Windows and Steam.