Descent: Freespace - The Great War

Descriptions:

As a pilot in the Gallactic Terran Alliance (GTA), you've known the Vasudans as the enemy for a long time. But things are about to change... An unknown menace, with technology beyond both ours and Vasudans, are destroying both sides... And now... Old enemies must unite to fight this common enemy, and the dissenters and traitors on both sides...

Descent: Freespace is a new chapter in space dogfight sims. The graphics are bigger, better, with more weapons and missiles/bombs. The capships in this game are truly HUGE (kilometers long, compared to your puny fighter). It also has true online multiplayer that puts it heads and shoulders above the rest. Take fighters and bombers on attack, recon, escort, and sweep missions against enemy capships and fighters/bombers. Defend your own capships and other assets... Your rating and performance is noted after every mission, with suggestions (if applicable). You can call in reinforcements (if available), and your wingmen actually do fight intelligently, as there can be dozens of fighters flying about.

As the game begins, you're set up as a pilot with the Galactic Terran Alliance, engaged in a long-running war with an alien race called the Vasudans. But as the war rages on, a powerful and vicious new enemy appears, forcing the GTA and the Vasudans to unite in order to survive.