Quick recap
Arthur loses Fenchurch during a hyperspace jump and drifts around the galaxy selling samples of his own body, until he becomes the sandwich maker on the planet Lamuella. Ford finds out the Guide has been bought by a company run by the Vogons, steals the new Guide Mark II and sends it to Arthur for safekeeping. Trillian shows up and leaves Arthur with their teenage daughter, Random. Random takes the Guide and runs off to Earth. Tricia McMillan is there too, the Trillian of another Earth, who never left with Zaphod. The Grebulons destroy Earth in every version, and the Vogons' plan for the new Guide is complete.
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