The Hitchhiker's Guide to the Galaxy a human-like alien writer for the eccentric, electronic travel guide "The Hitchhiker's Guide to the Galaxy", by hitchhiking onto a passing Vogon spacecraft. Following his rescue, Dent explores the galaxy with Prefect and encounters Trillian, another human who had been taken from Earth prior to its destruction by the President of the Galaxy, the two-headed Zaphod Beeblebrox, and the depressed Marvin, the Paranoid Android. Certain narrative details were changed between the various adaptations. The various versions follow the same basic plot but they are in many places mutually contradictory, as Adams rewrote the story substantially for each new adaptation. Throughout
Phrases from The Hitchhiker's Guide to the Galaxy radio series of "The Hitchhiker's Guide to the Galaxy" "fits", the word Carroll used to name the chapters of "The Hunting of the Snark". There is the persistent tale that 42 is Adams' tribute to the indefatigable paperback book, and is the average number of lines on an average page of an average paperback. Another common guess is that 42 refers to the number of laws in cricket, a recurring theme of the books. Mathematicians found a question whose answer is 42: what is the largest (rational) number n such that there are positive integers "p", "q", "r" such that