The Titan Fleet hurtles through the void of space at several times light speed, making their long way from the Milky Way Galaxy to its nearest neighbor. Numbering seventeen ships, three carrying more than 7000 people, the others carrying roughly 3000, the fleet contains all the descendants of the only survivors of planet Earth's death. They have encountered no other sentient life throughout their voyage from one great cluster of stars to the next, and do not expect to, either. Even if someone else should be crossing the void, the chances of running into them are quite literally astronomical.
Sometimes, though, that 1 in 1 000 000 000 chance does come to pass.