The Hitchhiker's Guide to the Galaxy by Douglas Adams
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Seconds before Earth is demolished to make way for a galactic freeway, Arthur Dent is plucked off the planet by his friend Ford Prefect, a researcher for the revised edition of The Hitchhiker's Guide to the Galaxy who, for the last fifteen years, has been posing as an out-of-work actor.
Together, this dynamic pair begin a journey through space aided by a galaxyful of fellow travelers: Zaphod Beeblebrox--the two-headed, three-armed ex-hippie and totally out-to-lunch president of the galaxy; Trillian (formerly Tricia McMillan), Zaphod's girlfriend, whom Arthur tried to pick up at a cocktail party once upon a time zone; Marvin, a paranoid, brilliant, and chronically depressed robot; and Veet Voojagig, a former graduate student obsessed with the disappearance of all the ballpoint pens he's bought over the years.