X-Wing vs TIE Fighter comes to Steam bundled with the Balance of Power expansion. Star Wars: X-Wing vs. TIE Fighter is the third release of the Star Wars: X-Wing space combat flight simulator series. The player has the ability to choose for each mission which squadron he or she wants to fly in (e.g. either the Y-wings that disable a ship for capture or the X-wings that support them), his or her specific ship type, and the ship's armaments. Players may choose imperial or rebel fighters depending on the mission. Balance of Power features a Rebel and an Imperial campaign of 15 missions each. The campaigns supported 8-player cooperative play. Both campaigns revolve around the same series of events, but with alternate endings.