From the introduction:
The universe does not want these survivors, and everywhere they go, there will be threats that would annihilate their. The crew visits the planets, each time hoping against hope that the next planet will be the one they can live on, their new homeworld. The rest of the time, they are adrift in the cosmos.
Players begin with multiple characters. The game assumes character death will be fairly frequent, leaving players with a single character for the climactic finale.