First a legendary radio series, then a bestselling book, now a blockbuser movie, the immensely successful Hitch Hiker's Guide to the Galaxy needs no introduction. Mostly Harmless, along with a guide to the guide and essential notes on how to leave the planet. This single hardback edition is indispensable for any would-be galactic traveller and for old and new fans of Douglas Adams, Doctor Who and bestselling science fiction books.