The first game, Star Trek: Starfleet Command, was released in 1999 by Interplay, and was based on Star Fleet Battles. It simulated fleet warfare in the Star Trek universe. The following year, a sequel was released, Star Trek: Starfleet Command II - Empires at War. This release was popular enough that an standalone expansion was released in 2001 for it, Star Trek: Starfleet Command - Orion Pirates. This expansion pack was one of the final Star Trek game releases by Interplay.