TIE Fighter (Game)
The finest game that LucasArts ever released, before its inevitable fall into crappyness. Is widely regarded as a classic, and was responsible for introducing the TIE Defender and Missile Boat into Star Wars.
As the name would imply, the player works for the Empire. Its plot is notable in that depicts the Empire as a more realistic organization, as opposed to an inhumanly evil one that it comes as in the movies.