Star Trek: Voyager - Elite Force Expansion Pack is an add-on to the earlier game, Star Trek: Voyager - Elite Force. It was created by Raven Software and published by Activision in 2001.
The pack added three main features to the game. The first was a voice pack that added Jeri Ryan to the main game as Seven of Nine - the original featured a replacement voice artist.
The second feature was a 'Virtual Voyager' sub-game, accessed separately from the main game, but taking place shortly before the game's final level. It allowed players to explore various decks of the starship, in great detail - accurately portraying areas of the ship seen on the televised series, but also expanding on the Elite Force universe as well. Areas that could be explored included main engineering, bridge, mess hall, sickbay, astrometrics and the cargo bay. The 'aim' of the sub-game was to find various hidden objects and achieve objectives, while giving an opportunity to interact with characters - including the TV cast - and use certain ship functions, such as the landing struts, the holodeck, transporters and others.
The final feature added more multiplayer maps and playing modes.