So Long, and Thanks for All the Fish

Arthur heads back to the earth he knows and loves, hitching in spacecrafts and then in a car with an exquisitely beautiful unconscious girl and her git of a brother. Meanwhile, Ford is in a space bar with a bad rep trying to pay for an entire bar tab using American Express... which no one in the known universe accepts. He, too, soon discovers the re-existence of Earth and wonders if Arthur knows.