4/4 Arthur and Ford are reunited on the distant and backward planet of Lamuella.
BBC Radio 4 Extra
3/4 Arthur is employed as a sandwich maker, and learns that he has become a dad.
2/4 Ford returns to the Guide's headquarters and uncovers the new editor's dastardly secret.
1/4 Arthur returns to where Earth ought to be, only to find a barely occupied planet.
4/4 Arthur and Fenchurch return from California, meet with Ford, then encounter an old friend.