The Grebulons are a race that only appear in the novel Mostly Harmless. They traveled across the galaxy in a sub-light ship and as such were in stasis during their trip. Their ship's main computer was the victim of a passing meteorite and while they survived in stasis, their memories, most of their central mission module, and the part of the ship that should have been able to detect that it had been struck by a meteorite were destroyed. All that it was able to resconstruct of their mission was "...Land...," "...safe distance..." and "...monitor it, and..."