Developer: LucasArts
Release Date: February 7, 1998
Source Code Release Date: Not released
Most of the time an expansion pack is just more content, usually some new enemies, etc. Star Wars Jedi Knight: Mysteries of the Sith is an expansion to Star Wars Jedi Knight: Dark Forces II but it featured more improvements like colored lighting and improved textures. It also featured Mara Jade, the most popular Expanded Universe character in history.