Mercury33
I'm not sure how to explain it, but basically the premise is that you take over literally day to day control of the galaxy starting the day after the Battle of Yavin. You control production, diplomacy, scouting, everything. If you play as the Empire you have to capture Luka and Mon Mothma and find and destroy the Rebel Headquarters. If you play as the Rebels, you have to capture Vader and Palpatine and you have to conquer Coruscant. I got it like 5 years ago, so it's probably not even on the market anymore. But if you're one of those micromanagement fans, you might want to see if you can find it on Ebay. Like I said before, it's really fun, but hard as hell.
Is it an RTS or an RPG?