I cannot say enough good things about Knights of the Old Republic.
Not to be confused with the sub-par MMORPG Star Wars: The Old Republic, Knights of the Old Republic is a single player RPG that places the player in the middle of a galactic war. After your ship is destroyed, you and your ship's captain explore the world of Taris in search of a jedi known as Bastila Shan. It is only after narrowly escaping the Sith infested homeworld that you learn that you have a sensitivity to the Force, and it is then that your adventures only just begin.
If you would like to learn more about this game before buying you can check out my Rewind Review from last year. Otherwise, buy it and play it for yourself on the Steam Store for $9.99. I guarantee you will not regret it.