Decimated by a Cylon attack, the last surviving members of the human race escape their ruined planet and head for sanctuary on the planet Earth. Travelling through space on the Battlestar Galactica, the survivors make a detour to the planet Carillon in order to stock up on supplies. But Carillon, like much of the rest of the universe, is in the grip of the evil Cylon aggressors, so our heroes must make plans for a daring secret mission. Lorne Greene, Richard Hatch and Dirk Benedict star.