Kochanski (Chloë Annett) is fed up 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.
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Lister (Craig Charles) is finding it very difficult to get used to life with only one arm, but seems to enjoy Kryten (Robert Llewellyn) nursing him, and Kryten is absolutely loving it.
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Down on the surface they find items from Red Dwarf including the original Holly (Norman Lovett) who explains that the nanobots had deconstructed Red Dwarf, creating their own miniature version of the ship and turned the rest into a planet for safekeeping.