After adapting his Hitchhiker's Guide to the Galaxy scripts from the BBC radio series into two successful novels, author Douglas Adams reshaped a rejected "Doctor Who" script he'd written into this third novel in the original trilogy. Reluctant space traveler Arthur Dent finds himself drawn into a race to save the universe from the people of Krikkit, who, upon discovering that they're not alone in the universe, set out to destroy it.

In consequence of a number of stunning catastrophies, Arthur Dent is surprised to find himself living in a hideously miserable cave on prehistoric Earth. However, just as he thinks that things cannot possibly get any worse, they suddenly do. He discovers that the Galaxy is not only mind-bogglingly big and bewildering, but also that most of the things that happen in it are staggeringly unfair.