And Another Thing...

by Eoin Colfer

And Another Thing... starts where Mostly Harmless ends, with Arthur Dent, Ford Prefect, Trillian, and Arthur and Trillian's daughter Random standing inside Club Beta, while the Earth is about to be destroyed by the Vogons. They are rescued by Zaphod Beeblebrox and the Heart of Gold. During a debate, Ford accidentally freezes Left Brain (Zaphod's second head who has been running the ship) and it seems they are doomed, until an immortal named Wowbagger brings them to safety. Angered by Wowbagger's insults, Zaphod promises to get Wowbagger killed, an idea to which Wowbagger, tired of immortality, has no objection; and so the group sets off in search of Thor, to see if he can kill Wowbagger.

Meanwhile, Prostetnic Vogon Jeltz, assigned to destroy all humans, hears rumours of a colony of Earthmen, and he sets off to destroy them, while Arthur attempts to get Wowbagger to stop the Vogons.

On the Earth colony Nano, the excessively stereotypical Irish leader Hillman Hunter is seeking applicants to be the planet's god, who would keep Hillman in charge due to divine providence. Meanwhile, Prostetnic Jeltz's son, Constant Mown, is having rather "un-Vogonly" thoughts, including an enjoyment of poetry and sympathy for humans. Wowbagger and Random start arguing, and Wowbagger drugs and imprisons Random. Afterwards, Trillian and Wowbagger fight, but they share a kiss at the end of the argument. Random is less than impressed with her mother's and Wowbagger's actions, and complains about it to Ford. During this conversation, Random steals Ford's company credit card.

Back on Asgard, Zaphod has managed to gain access to Valhalla and finds his old acquaintance Thor. After some negotiations, Thor agrees to help Zaphod by becoming Nano's god and killing Wowbagger.

Things on Nano are not going as planned, and Hillman is struggling to find his god and keep order among his own populace, as well as trying to control the Magratheans who built the planet. Hillman recalls creating a cult for the rich, which preached of a coming apocalypse, only for the Grebulons to create such an apocalypse. Having received an offer from Zaphod, Hillman and his followers relocated to their "haven", the planet Nano. However, many of the staff abandoned their rich employers and several rival religious groups also settled on the planet, the most prominent of these being the cheese-worshiping Tyromancers, led by Aseed. The Tyromancers and the Nanites enter into a war, and during one of the war's battles, the Heart of Gold and Thor suddenly arrive.

Wowbagger's ship lands on Nano and is met by the Tyromancers. Zaphod negotiates for Thor to be Nano's god and reveals that Aseed and Hillman are actually the same being from parallel universes, both of whom made deals with Zaphod. It is revealed that this is what brought him to Earth, saving Arthur and the rest. With Wowbagger representing the Tyromancers for show and Thor representing the Nanites, the two meet in battle.

The battle begins, but Thor is unable to win because Wowbagger does not die, even when hit with the hammer [[Mjöllnir]]. A package for Random arrives through interstellar freight, containing the rubber bands involved in Wowbagger's becoming immortal, which Random believes may be able to hurt him. Using Mjöllnir, enhanced with the rubber bands, Thor sends Wowbagger into the air.

The Vogons approach with the intent of destroying Nano. Thor is able to deflect the Vogon missiles, but is seemingly killed by an experimental weapon called QUEST. Constant Mown disables the Vogon gunner, and uses the argument that their orders are to kill Earthlings and not Nanites (legally two distinct groups, with the latter being taxpaying citizens). Prostetnic Jeltz agrees to his argument, and is proud of his son's ability to follow law and bureaucracy. Zaphod and Hillman tell the people that Thor is Nano's martyr and that all commands he will issue shall henceforth come from Hillman, only for Hillman to be sliced in two by a piece of bomb debris.

Luckily, Hillman's death is short, as the Heart of Gold medical bay restores him to full health, with only one minor change – he now has hooves rather than feet. Even though he now has control over the populace, he grows displeased upon finding himself swamped with civic paperwork. Zaphod sets off with Left Brain to work on his re-election campaign, and Ford has decided to stay behind and sample the best Nano has to offer, so he can write material for the Guide. Up in space, a very much alive Thor is pleased to learn of his rise back to fame, and the success of his "martyrdom" trick. Arthur finds the beach from his construct. To his displeasure, he finds that Vogons are going to destroy it.