Half-Life 2: Episode One | game trailer

Half-Life 2: Episode One is an all-new episode created by Valve that extends the Half-Life 2 single player adventure. The player reprises his role of Dr. Gordon Freeman, who must immediately face the repercussions of his actions in City 17 and the Citadel. Freeman reconnects with Alyx Vance and her robot, Dog, as they continue their support of the resistance’s battle against the Combine forces. Valve, 2006