An expansion pack to the PC version of Star Trek: Voyager - Elite Force was announced by Activision in February 2001. The expansion pack does not add new campaign content in the conventional sense, rather adding a "Virtual Voyager" mode to the game, allowing the player to explore ten more decks of the ship. Within these ten levels, the player can interact with a variety of characters, collect secret items and operate various ship functions such as using replicators, reading characters' personal logs and accessing the ship's computer files. Two new combat campaigns are added, integrated as holodeck programs; the first revolves around Tom Paris' black-and-white Captain Proton hobby, while the second is based around an infiltration mission into a Klingon base. In addition, five new multiplayer modes were introduced. Development was completed on May 5, 2001, and the expansion pack was released on May 16, 2001. With ratings of 59 percent and 62 percent on the aggregator sites Game Rankings and Metacritic, respectively, the expansion did not enjoy the critical acclaim of the original material. While the pack was considered to maintain its predecessor's production values, it was thought to lack the focus and breadth of the original game.
Star Trek: Voyager - Elite Force: Expansion Pack adds an additional five game types. In an "assimilation" match, one team plays as Borg and must attempt to assimilate the other team; if a player is assimilated, they join the Borg team, gradually reducing the number of players on the other team. The "action hero" mode gives one player more weapons, health, and overall power than every other player, but when an opposing player kills this player they take these advantages. A further game type known as "elimination" is a deathmatch game except that players can't respawn. As player characters are killed, they sit out the remainder of the round until only one player is left alive. The "disintegration" mode gives every player a slow firing semi-automatic phaser rifle that will kill and vaporize an opposing player in one shot, thus requiring shots to be carefully aimed to ensure they hit. The final game mode, called "specialties", adds a class-based mode for team deathmatch and capture the flag modes, giving players the option to choose from one of six combat roles, such as a sniper, medic or infiltrator, each with different weapons, speeds and abilities.
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