Star Wars: Rebellion (or Supremacy, as it was known across the pond) is a real-time 4X game Lucasarts released in 1998 to quite mixed reviews. I bought it and played it quite a bit, though almost always from the Rebel side. I have a hard time playing the bad guys. Rebellion is set just after the destruction of the first Death Star at Yavin, and you have to win over support of the existing core worlds while colonizing worlds in the unknown territories. You must also recruit more heroes to your side, and they make heavy use of the Expanded universe so you are just as likely to find Grand Admiral Thrawn or Garm Bel Iblis as you are General Covell or Wedge Antilles.
Rebellion moved at a fairly slow pace, unless you jacked up the speed on how fast the ‘days’ passed. As time passed, you could build all sorts of buildings on the planets, to gather and refine minerals, defensive structures, and the factories for ships and training grounds for troops. The only ‘action’ was ship to ship combat when two fleets met at a planet, though it could be done by the computer. Most everything else was resolved automatically, such as diplomacy missions to neutral (or enemy) planets, sabotage, and orbital bombardment.
I think what I liked most about SW:R was finding and recruiting everybody. You never knew who you were going to find, and it seemed really cool that a lot of them were from the books. It was very hard to ‘win’ this game with the default rules as you had to capture the two main characters from the opposing side (Vader and Palpatine, or Mon Mothma and Luke Skywalker) and since they could be anywhere, including in transit aboard ships, it became very frustrating. You can set the game to accept just destroying the home base as a win though.
There was a decent sized mod community, though I don’t know how active they are now, but there were many changes made available. I have reinstalled it a few times over the years so you know it stuck with me. Rebellion definitely got a bit of a bad rap.