 Kochanski (Chloë Annett) is fed up with seeing Kryten doing things for him that he could easily do with one arm, so with Kryten's help they come up with a solution - nanobots from Kryten's self-repair system could conceivably rebuild an arm for Lister.The problem is, Kryten hasn't seen his nanobots since the attack on the crew by the Despair Squid hundreds of years earlier, right before they lost "Red Dwarf".They therefore decide to retrace their steps all the way back to the ocean planet where they met the Despair Squid and have to go into Deep Sleep for the very long journey.