After communicating via radio messages for years, these four starfaring races meet in a region of space called the Frontier Sector. This vast region, 1,500 cubic light-years, contains 38 star systems. Only 17 of these systems have been explored and colonized when the game starts. Free enterprise is the law of the Frontier, and corporations compete with each other and local governments to control the most profitable areas and to open routes to unexplored systems. Player characters are placed in this unexplored territory. They can work as corporate or government agents, or can strike out on their own as free-lance adventurers.
Despite their apparent differences, the four races share one thing: a common enemy that came upon them some time ago. Without warning, a fleet of warships attacked Frontier outposts and isolated colonies, destroying whatever they found wherever they went, fighting to the death or destroying themselves to avoid being captured. Only after several battles was it learned that the marauders were the Sathar, an evil race of worm-like aliens from outside the frontier.
In the face of this onslaught, the four races formed a loose military alliance to protect their colonies: the United Planetary Federation. The second wave of Sather attacks was met by UPF warships. The invaders were slowly beaten back, system by system, until they withdrew completely, leaving no clues that would lead the victors back to their home world.
Defeated in space, the Sather turned to terrorism. Humans, Dralasites, Vrusk, and Yazirians were recruited to sabotage frontier bases and destroy the morale of the colonists. These deadly agents now lurk on almost every known planet, carrying out their master’s orders and undermining the efforts of local authorities to build up their worlds.