>>5351047
The episode opens with Ford and Arthur on Lamuella. Ford explains about the new guide and its ability to use Reverse Temporal Engineering in order to arrange circumstances for the benefit of its user. Ford's spaceship itself he obtained by jumping from a building and falling into it, its previous occupant having accidentally pressed the wrong sort of eject button. Tracing back, he discovered that a trail of coincidences led back to the new Guide, which was responsible. With Random stealing the ship and the Bird, they are stuck, with no immediate way to get offworld to prevent the Vogons from doing whatever it is they intend to do. They decide that the Perfectly Normal Beasts are the best way off the planet. The migration has already started, and this sees them appear at one point, run past Lamuella, and then disappear again, evidence of a dimensional shift. Old Thrashbarg helps them slow a Perfectly Normal Beast long enough for them to get onto it, and tells them that they will be entering the Domain of the King.
On the alternate Earth, Tricia McMillan has returned from Rupert, and is lamenting that none of the footage she has taken is usable. She is interrupted by a member of the hotel staff, telling her that a spaceship has landed in Regent's Park, and the young girl on the ship is demanding to see her. Meanwhile, the Grebulon leader is still unhappy. Whilst they now have horoscopes, he now knows that unless he takes positive action, then due to the Earth rising, he will have a very bad month. He decides to investigate the possible astrological uses of the Grebulon's gun turrets.
Arthur and Ford arrive at the Domain of the King Bar and Grill, which has numerous spaceships outside of it, including a large pink one. Inside, they have a couple of bacon rolls, whilst Ford buys the pink spaceship from the bar singer, Elvis Presley. They then depart for Earth. After arriving, they find that Tricia McMillan has taken Random to a club, and go there themselves. A strange man confronts Arthur, and says "I told you not to come here!" Arthur and Ford find Random, along with Tricia and Trillian (who had arrived in the meantime on a third spaceship). Random is holding a gun and threatening to shoot. Trillian explains they must leave the planet immediately, as the Grebulons (a missing spaceship from the war she was sent to cover) are about to destroy the planet, once again.
Arthur explains it is impossible for him to die (and hence for the planet to be destroyed), but the strange man goes for Random's gun and she ends up shooting him. Trillian points out the name of the club to Arthur—Stavro Müller Beta—while Arthur realizes the strange man is Agrajag. Arthur accepts his fate, and the Earth is destroyed…
Epilogue
An updated edition of the Guide notes that Babel fish share the ability of the dolphins in shifting sideways in probability when required, bringing their host and sometimes other people in the vicinity with them, and notes that this in fact has happened. The Guide shares the fate of Arthur in two alternate realities: the first, continuing from the end of Fit the Twelfth, sees Arthur and Lintilla and several of her clones aboard the Heart of Gold; the second sees Arthur from the beginning of the story, this time battling over the fate of his home with Prosser alongside Fenchurch.
The Guide then details the true reality of what happened: the Babel Fish brought Arthur, Ford, Random, Zaphod and Trillian (now merged with Tricia) to Milliways, the Restaurant at the End of the Universe, Table 42. While Zaphod discovers Marvin is still under warranty and continues to park cars, albeit with a promotion, Arthur discovers the waitress serving their table is Fenchurch, who has been at Milliways waiting for him to turn up. As Wowbagger the Infinitely Prolonged arrives to insult the Great Prophet Zarquon, making his perennial appearance on the Milliways stage, his immortality is rescinded, and he dies. Elsewhere in the universe, Prostetnic Vogon Jeltz, having finally destroyed the Earth after all this time, is able to tick the box on his orders and move on. Reunited, Arthur promises to take Fenchurch flying.