Red Dwarf s7e 8 Nanarchy

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. Kochanski (Chloë Annett) is fed up with seeing Kryten doing things for him that he could easily do with one arm. Tests with a prototype prosthetic arm are unsuccessful, with its two settings resulting either in Lister having to exert great effort to move it or in Lister repeatedly punching Kryten in the head due to subconscious anger. Kryten comes 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.

When they emerge from Deep Sleep near their destination they are surprised to discover a planetoid which the Navicomp identifies as Red Dwarf. Down on the desert surface they find items from Red Dwarf including the original Holly (Norman Lovett) who explains that the nanobots restored his core program and then mutinied: they deconstructed Red Dwarf, creating their own miniature version of the ship and turned the rest into a planetoid for safekeeping, converting the ship's many computerized systems into sand. The crew now realize that it was the nano version of Red Dwarf that they were chasing all along – the nanobots ended up evading them by coming aboard Starbug and travelling around their own galaxy inside Lister's clothes hamper and that all along Red Dwarf had been with them.

Kryten captures the nanobots in a glass jar and tortures them by tapping the side with a pencil. He tells them to make a new arm for Lister and to turn the planetoid back into Red Dwarf. The nanobots follow Kryten's orders. As a result, Lister is given the body of a muscular bodybuilder, which the others assume to be from the nanobots feeling guilty for all the trouble they have caused. But then Starbug flies into the reconstructed Red Dwarf, which is also shown to be awfully bigger than normal. In the last shot Starbug flies in like a buzzing fly against a massively enlarged ship in the hangar.