DESC: In this episodic sequel (formerly known as "Aftermath"), players continue the groundbreaking story that came to an explosive halt at the conclusion of Half-Life 2. Players once again assume the role of Gordon Freeman and team up with sidekick Alyx Vance to flee the remnants of a nearly-destroyed City 17 and it's eerily-empty streets. The action begins quickly as the damage to the citadel has been done and Gordon and Alyx must lead the evacuation effort. Enemies previously un-attackable such as crab and mortar synths now stand in your path as you try to help Gordon and others escape the imminent citadel blast. Once again utilizing the Source technology and HDR lighting popularized by Half Life 2, Episode One aims to begin the tradition of episodic content for Half Life fans. Gamers can expect over six hours of game play while taking out enemies with the help of Alyx's pet robot dog.