1372 years ago the starship Wahoo left its homeworld to explore the stars. The intrepid crew was composed of the most skilled members of their species.
Two years into the voyage a comet smashed into the Wahoo killing everyone aboard.
Three years ago, the Wahoo's bots, and the ship's computer became self-aware. The Bots decided to continue the only task they knew, repairing the damaged ship and returning home.
Unfortunately, they no longer know where home is and they're all slightly insane.