Episode One follows scientist Gordon Freeman and his companion Alyx Vance as they fight in humanity's continuing struggle against the transhuman race known as the Combine. When the story begins, Gordon wakes up outside the enemy's base of operations, the Citadel, after being left unconscious from the concluding events of Half-Life 2. During the course of the game, Gordon travels with Alyx as they attempt to evacuate the city.
Just like Half-Life 2, Episode one is awesome, some epic eye-pleasing chapters, overall just kicks ***.
But, the one thing I hate about Episode one, the one and only thing...just when you're getting into it - it ends. That and there's not much for new weapons or enemies. That is why I'm giving it an 8/10.
Be sure to buy this (or the Orange Box), so you can continue on with the Half-Life 2 experience, you won't regret it!