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* FailedAttemptAtScaring: Slartibartfast makes a spectacularly feeble threat to Arthur Dent, realises it hasn't worked, and deflatedly remarks.

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* FailedAttemptAtScaring: Slartibartfast makes a spectacularly feeble threat to Arthur Dent, realises it hasn't worked, and deflatedly remarks.remarks:
--> Late, as in the late Dentarthurdent. It's a sort of threat, you see. I've never been terribly good at them myself, but I'm told they can be terribly effective.
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* UnluckyExtra: Agrajag is an unfortunate soul that happens to reincarnate into incidental creatures that Arthur Dent accidentally kills (a pot of flowers, a fly, etc...). Agrajag eventually becomes aware of his past lives and becomes more and more spiteful toward Arthur until his dislike actually materializes into the "Cathedral of Hate", to which he eventually abducts Arthur; thanks to the vagaries of time travel, it turns out that he can't kill Arthur because one of the deaths he wants revenge for hasn't happened yet (it eventually occurs in the final chapter of ''Mostly Harmless''). Arthur proceeds to accidentally kill him again while escaping.

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* UnluckyExtra: Agrajag is an unfortunate soul that happens to reincarnate into incidental creatures that Arthur Dent accidentally kills (a [[spoiler: pot of flowers, flowers]], a fly, etc...). Agrajag eventually becomes aware of his past lives and becomes more and more spiteful toward Arthur until his dislike actually materializes into the "Cathedral of Hate", to which he eventually abducts Arthur; thanks to the vagaries of time travel, it turns out that he can't kill Arthur because one of the deaths he wants revenge for hasn't happened yet (it eventually occurs in the final chapter of ''Mostly Harmless''). Arthur proceeds to accidentally kill him again while escaping.



* WhyWeNeedGarbagemen: series, it's eventually revealed that the planet the human species originated was wiped out by a virus contracted from a telephone after they determined only great thinkers and doers were important to society and sent everyone else in society off to another planet (Earth) to be forgotten about--including the telephone sanitizers.

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* WhyWeNeedGarbagemen: In the series, it's eventually revealed that the planet the human species originated was wiped out by a virus contracted from a telephone after they determined only great thinkers and doers were important to society and sent everyone else in society off to another planet (Earth) to be forgotten about--including the telephone sanitizers.
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* AwkwardPoetryReading: Arthur and Ford are subjected to the horrendously bad poetry of the Vogon Captain, who then offers them a choice; get tossed out of the airlock, or tell him how much they liked his poem. Arthur tries to [[BlatantLies baldface]] his way out of it by trying to claim he rather enjoyed it.

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* AwkwardPoetryReading: Arthur and Ford are subjected to the horrendously bad poetry of the Vogon Captain, who then offers them a choice; get tossed out of the airlock, or tell him how much they liked his poem. Arthur tries to [[BlatantLies baldface]] his way out of it by trying to claim he rather enjoyed it.it[[note]]or possibly being the first and only creature to actually enjoy it[[/note]].
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--> Meanwhile, the natural forces on the planet Vogsphere had been working overtime to make up for their earlier blunder. They brought forth scintillating jeweled scuttling crabs, which the Vogons age...tall aspiring trees of breathtaking slenderness and color which the Vogons cut down and burned the crabmeat with; elegant gazellelike creatures with silken coats and dewy eyes which the Vogons would catch and sit on. They were no use as transport because [[CrossesTheLineTwice their backs would snap instantly,]] but the Vogons sat on them anyway.

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--> Meanwhile, the natural forces on the planet Vogsphere had been working overtime to make up for their earlier blunder. They brought forth scintillating jeweled scuttling crabs, which the Vogons age...ate...tall aspiring trees of breathtaking slenderness and color which the Vogons cut down and burned the crabmeat with; elegant gazellelike creatures with silken coats and dewy eyes which the Vogons would catch and sit on. They were no use as transport because [[CrossesTheLineTwice their backs would snap instantly,]] but the Vogons sat on them anyway.
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* WhatOtherGalaxies: The Milky Way is the only galaxy ever mentioned in detail (however there is a "distant Galaxy" where warlords misinterpret "I seem to be having tremendous difficulty with my life-style" as one of the worst insults in their native language, and they even attack the Milky Way, but are aten by a dog), even though the outlandish technology we see would presumably make intergalactic travel feasible -- the Improbability Drive technology, in particular. The most notable references to "the Universe" are either metaphysical ("the Answer to the question of Life, the Universe, and Everything") or temporal (the titular "[[Literature/TheRestaurantAtTheEndOfTheUniverse Restaurant at the End of the Universe]]" is permanently located at the end of time itself). There is at least one mention of a wider physical universe when someone speculates that the enigmatic Galactic President may in fact rule all of it.

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* WhatOtherGalaxies: The Milky Way is the only galaxy ever mentioned in detail (however there is a "distant Galaxy" where warlords misinterpret "I seem to be having tremendous difficulty with my life-style" as one of the worst insults in their native language, and they even attack the Milky Way, but are aten eaten by a dog), even though the outlandish technology we see would presumably make intergalactic travel feasible -- the Improbability Drive technology, in particular. The most notable references to "the Universe" are either metaphysical ("the Answer to the question of Life, the Universe, and Everything") or temporal (the titular "[[Literature/TheRestaurantAtTheEndOfTheUniverse Restaurant at the End of the Universe]]" is permanently located at the end of time itself). There is at least one mention of a wider physical universe when someone speculates that the enigmatic Galactic President may in fact rule all of it.
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* ProphecyArmor: Arthur's encounter with Agrajag leaves him believing that he can't die until he's visited a planet called Stavromula Beta, where he ducked to avoid being shot and the shot killed Agrajag instead. It turns out to actually be a nightclub on Earth called "Stavro Mueller's Beta".

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* ProphecyArmor: Arthur's encounter with Agrajag leaves him believing that he can't die until he's visited a planet called Stavromula Stavromulos Beta, where he ducked to avoid being shot and the shot killed Agrajag instead. It turns out to actually be a nightclub on Earth called "Stavro Mueller's Beta".
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* ProphecyArmor: Arthur's encounter with Agrajag leaves him believing that he can't die until he's visited a planet called Stavromulos Beta, where he ducked to avoid being shot and the shot killed Agrajag instead. It turns out to actually be a nightclub on Earth called "Stavro Mueller's Beta".

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* ProphecyArmor: Arthur's encounter with Agrajag leaves him believing that he can't die until he's visited a planet called Stavromulos Stavromula Beta, where he ducked to avoid being shot and the shot killed Agrajag instead. It turns out to actually be a nightclub on Earth called "Stavro Mueller's Beta".
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** And later on, in ''The Restaurant at the End of the Universe:''
--> Anatomical analysis of the Vogon reveals that its brain was originally a badly deformed, misplaced, and dyspeptic liver.

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* ArtifactTitle: Lampshaded with ''Literature/MostlyHarmless'' bearing the description, "The fifth book in the increasingly inaccurately named Hitchhiker's Trilogy." Some later editions of the other novels include similar blurbs, and ''Literature/AndAnotherThing'' is simply subtitled "Book 6 of 3".

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* ArtifactTitle: Lampshaded with ''Literature/MostlyHarmless'' bearing the description, "The fifth book in the increasingly inaccurately named Hitchhiker's Trilogy." Some later editions of the other novels include similar blurbs, and ''Literature/AndAnotherThing'' is simply subtitled "Book "[[RuleOf3 Book]] 6 [[OverlyLongGag of 3".3]]".
* ArtisticLicenseBiology A likely unintentional example: the introduction to the first book calls humans "ape-descended life forms." We didn't descend from apes; we and apes share a common ancestor.
** PlayedForLaughs when it comes to the Vogons.
--> He was that way because billions of years ago...it was as if the forces of evolution had simply given up on them there and then, had turned aside in disgust and written them off as an ugly and unfortunate mistake. They never evolved again: they should never have survived.
--> The fact that they did is some kind of tribute to the thick-willed slug-brained stubbornness of these creatures...and what nature refused to do for them [[BeyondTheImpossible they simply did without]] until such time as they were able to rectify the gross anatomical inconveniences with surgery.
--> Meanwhile, the natural forces on the planet Vogsphere had been working overtime to make up for their earlier blunder. They brought forth scintillating jeweled scuttling crabs, which the Vogons age...tall aspiring trees of breathtaking slenderness and color which the Vogons cut down and burned the crabmeat with; elegant gazellelike creatures with silken coats and dewy eyes which the Vogons would catch and sit on. They were no use as transport because [[CrossesTheLineTwice their backs would snap instantly,]] but the Vogons sat on them anyway.
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* ObsoleteOccupation: {{Parodied|Trope}} and [[DeconstructedTrope deconstructed]]; one of the many random things mentioned about the galaxy is a planet that reached utopia and summarily sent everybody with a superfluous job (such as "phone sanitiser") into exile -- and then everybody in said utopia died of an epidemic caused by unsanitised telephones.
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* ReincarnatedAsANonHumanoid: {Exaggerated|Trope}} for BlackComedy with Agrajag, a cosmic ButtMonkey who's been reincarnated across time and space into innumerable forms that keep getting unknowingly killed by Arthur Dent - a fly he swatted, an oyster he ate, a fish he caught but didn't eat, [[spoiler:a bowl of petunias he accidentally dropped from orbit...]]

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* ReincarnatedAsANonHumanoid: {Exaggerated|Trope}} {{Exaggerated|Trope}} for BlackComedy with Agrajag, a cosmic ButtMonkey who's been reincarnated across time and space into innumerable forms that keep getting unknowingly killed by Arthur Dent - a fly he swatted, an oyster he ate, a fish he caught but didn't eat, [[spoiler:a bowl of petunias he accidentally dropped from orbit...]]
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* ReincarnatedAsANonHumanoid: {Exaggerated|Trope}} for BlackComedy with Agrajag, a cosmic ButtMonkey who's been reincarnated across time and space into innumerable forms that keep getting unknowingly killed by Arthur Dent - a fly he swatted, an oyster he ate, a fish he caught but didn't eat, [[spoiler:a bowl of petunias he accidentally dropped from orbit...]]
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* AwkwardPoetryReading: Arthur and Ford are subjected to the horrendously bad poetry of the Vogon Captain, who then offers them a choice; get tossed out of the airlock, or tell him how much they liked his poem. Arthur tries to [[BlatantLies baldface]] his way out of it by trying to claim he rather enjoyed it.
-->'''The Hitchhiker's Guide:''': ''Vogon poetry is of course the third worst in the universe. The second worst is that of the Azgoths of Kria. During a recitation by their poetmaster Grunthos the Flatulent of his poem "Ode to a Small Lump of Green Putty I Found in My Armpit One Midsummer Morning", four of his audience died of internal haemorrhaging and the President of the Mid-Galactic Arts Nobbling Council only survived by gnawing one of his own legs off. Grunthos was reported to have been "disappointed" by the poem's reception, and was about to embark on a reading of his 12-book epic entitled "Zen and the Art of Going to the Lavatory", when his own major intestine, in a desperate attempt to save lifekind, leapt straight up through his neck and throttled his brain. The very worst poetry of all, and its creator, Paula Nancy Millstone Jennings of Greenbridge, Essex, England, perished in the destruction of the planet Earth. Vogon poetry is mild by comparison.''
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Add a note; see chapter 31 of the first book.


* WhatOtherGalaxies: The Milky Way is the only galaxy ever specifically mentioned, even though the outlandish technology we see would presumably make intergalactic travel feasible -- the Improbability Drive technology, in particular. The most notable references to "the Universe" are either metaphysical ("the Answer to the question of Life, the Universe, and Everything") or temporal (the titular "[[Literature/TheRestaurantAtTheEndOfTheUniverse Restaurant at the End of the Universe]]" is permanently located at the end of time itself). There is at least one mention of a wider physical universe when someone speculates that the enigmatic Galactic President may in fact rule all of it.

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* WhatOtherGalaxies: The Milky Way is the only galaxy ever specifically mentioned, mentioned in detail (however there is a "distant Galaxy" where warlords misinterpret "I seem to be having tremendous difficulty with my life-style" as one of the worst insults in their native language, and they even attack the Milky Way, but are aten by a dog), even though the outlandish technology we see would presumably make intergalactic travel feasible -- the Improbability Drive technology, in particular. The most notable references to "the Universe" are either metaphysical ("the Answer to the question of Life, the Universe, and Everything") or temporal (the titular "[[Literature/TheRestaurantAtTheEndOfTheUniverse Restaurant at the End of the Universe]]" is permanently located at the end of time itself). There is at least one mention of a wider physical universe when someone speculates that the enigmatic Galactic President may in fact rule all of it.
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* WhyWeNeedGarbagemen: series, it's eventually revealed that the planet the human species originated was wiped out by a virus contracted from a telephone after they determined only great thinkers and doers were important to society and sent everyone else in society off to another planet (Earth) to be forgotten about--including the telephone sanitizers.
Is there an issue? Send a MessageReason:
Clarification


* WhatOtherGalaxies: The Milky Way is the only galaxy ever specifically mentioned, even though the outlandish technology we see would presumably make intergalactic travel feasible -- the Improbability Drive technology, in particular. The most notable references to "the Universe" are either metaphysical ("the Answer to Life, the Universe, and Everything") or temporal (the titular "[[Literature/TheRestaurantAtTheEndOfTheUniverse Restaurant at the End of the Universe]]" is permanently located at the end of time itself). There is at least one mention of a wider physical universe when someone speculates that the enigmatic Galactic President may in fact rule all of it.

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* WhatOtherGalaxies: The Milky Way is the only galaxy ever specifically mentioned, even though the outlandish technology we see would presumably make intergalactic travel feasible -- the Improbability Drive technology, in particular. The most notable references to "the Universe" are either metaphysical ("the Answer to the question of Life, the Universe, and Everything") or temporal (the titular "[[Literature/TheRestaurantAtTheEndOfTheUniverse Restaurant at the End of the Universe]]" is permanently located at the end of time itself). There is at least one mention of a wider physical universe when someone speculates that the enigmatic Galactic President may in fact rule all of it.
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Clarifications


When he was eighteen, drunk in a field in Innsbruck, hitchhiking across Europe, Creator/DouglasAdams looked up at the sky filled with stars and thought, "Somebody ought to write the Hitchhiker's Guide to the Galaxy." Then he went to sleep and almost, but not quite, forgot all about it.

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When he was eighteen, drunk in a field in Innsbruck, hitchhiking across Europe, Creator/DouglasAdams looked up at the sky filled with stars and thought, "Somebody ought to write the Hitchhiker's Guide to the Galaxy." Then he went to sleep and almost, but not quite, forgot all about it.
it. Unfortunately, this is just a myth.



* TheMeaningOfLife: A machine is fed information to calculate the ultimate answer to life, the universe and everything. The answer? [[NonAnswer 42]]. The machine can't calculate the ultimate ''question'', but it can design another machine that might...

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* TheMeaningOfLife: A machine is fed information to calculate the ultimate answer to the question of life, the universe and everything. The answer? [[NonAnswer 42]]. The machine can't calculate the ultimate ''question'', but it can design another machine that might...
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* FailedAttemptAtScaring: Slartibartfast makes a spectacularly feeble threat to Arthur Dent, realises it hasn't worked, and deflatedly remarks.
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* InsistentTerminology: This series is a trilogy, no matter [[TrilogyCreep how many books]] are in it.
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* WeirdWorldWeirdFood: The cuisine shown throughout the galaxy is consistently bizarre to match the interstellar setting and offbeat, humorous tone of the story. Particular mention goes to the Pan-Galactic Gargle Blaster, a drink so alcoholic that the Guide compares it to a traumatic brain injury, and the meat dish Arthur orders at the Restaurant at the End of the Universe (in [[Literature/TheRestaurantAtTheEndOfTheUniverse the book of the same name]]) that comes from a giant, wrinkled, and casually suicidal bovine humanoid.
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* SiliconSnarker: Marvin has a tendency to be sarcastic and snarky to his organic compatriots when he's not being miserably depressed (though he can manage both at the same time).
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For all versions of the story, including the TV Series, Radio Series, Video Game/Text Adventure, Film, Theatre Plays and Comic Series, see ''Franchise/TheHitchhikersGuideToTheGalaxy''.

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For all versions of the story, including the TV Series, Radio Series, Video Game/Text Adventure, Film, Theatre Plays series, radio series, video game/text adventure, film, theatre plays and Comic Series, comic series, see ''Franchise/TheHitchhikersGuideToTheGalaxy''.
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* WhatOtherGalaxies: The Universe is mentioned several times (the Answer to Life, the Universe, and Everything, ''Literature/TheRestaurantAtTheEndOfTheUniverse''), yet no other galaxy is ever acknowledged. To be fair, the Restaurant at the End of the Universe is at the temporal end of the universe, not the physical end.

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* WhatOtherGalaxies: The Universe Milky Way is mentioned several times (the the only galaxy ever specifically mentioned, even though the outlandish technology we see would presumably make intergalactic travel feasible -- the Improbability Drive technology, in particular. The most notable references to "the Universe" are either metaphysical ("the Answer to Life, the Universe, and Everything, ''Literature/TheRestaurantAtTheEndOfTheUniverse''), yet no other galaxy is ever acknowledged. To be fair, the Everything") or temporal (the titular "[[Literature/TheRestaurantAtTheEndOfTheUniverse Restaurant at the End of the Universe Universe]]" is permanently located at the temporal end of the universe, not the time itself). There is at least one mention of a wider physical end.universe when someone speculates that the enigmatic Galactic President may in fact rule all of it.
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* AffablyEvil: The Vogon guard. He's not such a bad guy once he stops shouting, and genuinely appreciates Ford's sympathy for how lousy his job is, but in the end he decides that he'd better throw Ford and Arthur out of the airlock after all, "and then get on with some other bits of shouting I've got to do."
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->-- '''''DON'T PANIC.'''''

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->-- '''''DON'T ->'''''DON'T PANIC.'''''
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not sure if this belongs here or on a page for one of the specific books

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* FTLTravelSickness: The sensation of entering hyperspace is described as feeling like getting turned inside out at the navel. The experimental Infinite Improbability Drive has even more esoteric effects, such as temporarily turning the passengers into penguins.
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crosswicking

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* ArtifactTitle: Lampshaded with ''Literature/MostlyHarmless'' bearing the description, "The fifth book in the increasingly inaccurately named Hitchhiker's Trilogy." Some later editions of the other novels include similar blurbs, and ''Literature/AndAnotherThing'' is simply subtitled "Book 6 of 3".
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* SpaceSector: The sector of the Galaxy containing Earth is "Sector [=ZZ9=] Plural Z Alpha"; like much else in the franchise, likely an AffectionateParody of a widely-used science fiction trope.
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->-- '''DON'T PANIC.'''

When he was eighteen, drunk in a field in Innsbruck, hitchhiking across Europe, Creator/DouglasAdams looked up at the sky filled with stars and thought, “Somebody ought to write the Hitchhiker’s Guide to the Galaxy.” Then he went to sleep and almost, but not quite, forgot all about it.

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->-- '''DON'T '''''DON'T PANIC.'''

'''''

When he was eighteen, drunk in a field in Innsbruck, hitchhiking across Europe, Creator/DouglasAdams looked up at the sky filled with stars and thought, “Somebody "Somebody ought to write the Hitchhiker’s Hitchhiker's Guide to the Galaxy." Then he went to sleep and almost, but not quite, forgot all about it.

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[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/the_hitchhikers_guide_to_the_galaxy_collection.jpg]]
->-- '''DON'T PANIC.'''

When he was eighteen, drunk in a field in Innsbruck, hitchhiking across Europe, Creator/DouglasAdams looked up at the sky filled with stars and thought, “Somebody ought to write the Hitchhiker’s Guide to the Galaxy.” Then he went to sleep and almost, but not quite, forgot all about it.

''The Hitchhiker's Guide to the Galaxy'' is the trilogy-in-six-books by Adams, with the sixth book being written by ''Literature/ArtemisFowl'''s Creator/EoinColfer. It began in 1979, as an adaptation of the radio series of the same name, also written by Douglas Adams, but eventually diverged from and expanded on the plot of the original. It's arguably the best-known version of the series.

The first book, ''Literature/TheHitchhikersGuideToTheGalaxy1'', was adapted straight from the radio shows. It covers Arthur Dent's last day on Earth, meeting with the other characters, questing for the legendary planet of Magrathea, and the story of Deep Thought. It leads directly into the next book.

The second, ''Literature/TheRestaurantAtTheEndOfTheUniverse'', also came from the radio version, although with many more changes and a shifting-about of the order of events. These first two books can, in many ways, be thought of as halves of the same story, in a way that the sequels aren't. In ''Restaurant'', the characters visit Milliways, the titular establishment at the rear end of time, Zaphod and Trillian attempt to discover who truly runs the universe, and Ford and Arthur end up on a spaceship full of useless people which crashes into prehistoric Earth.

The third book, ''Literature/LifeTheUniverseAndEverything'', is the most conventionally adventure-ish book of the series; not surprising, since it was adapted from an unused ''Series/DoctorWho'' script. Ford and Arthur get pulled back to modern-day Earth, pre-explosion, where Slartbartifast enlists them and, eventually, the rest of the cast to stop the machinations of the xenophobic Krikkitmen, who, at the dawn of galactic civilization, were responsible for the bloodiest war the universe has ever seen, but who were [[Main/SealedEvilInACan sealed in a slow-time bubble]]... until now.

The fourth book, ''Literature/SoLongAndThanksForAllTheFish'', is, on the other hand, probably the most character-based of the series. Arthur returns to an unexpectedly-resurrected Earth, but after his adventures among the stars, he's just as [[Main/FishOutOfWater out of his element here]] as he was when he first hitched a ride on a spaceship. He attempts to solve the mysterious disappearance of the planet's dolphin population alongside his new girlfriend, Fenchurch, who is implied to be the woman featured in the first pages of the first book.

The fifth, ''Literature/MostlyHarmless'', is a dark romp through the corridors of probability. The Guide has been taken over by the Vogons, and Arthur has lost his love and has settled in as a sandwich-maker in a primitive tribe on a faraway planet. But then Trillian shows up with a surprise -- a teenage daughter, conceived with Arthur's donated DNA. Its creator felt it was too strongly coloured by a bitter breakup he had undergone at the time, and intended to write a sequel, but due to his infamous procrastination, died before completing anything tangible.

A sixth book, ''Literature/AndAnotherThing'' was written by Creator/EoinColfer, author of the ''Literature/ArtemisFowl'' children's novels, and published in October 2009. Starting where ''Mostly Harmless'' left off, the tone of the book in general is much [[LighterAndSofter lighter]] and removes the [[DownerBeginning downer beginning]] the series ended with. There is some controversy as to whether it lives up to the main series, and it is [[FanonDiscontinuity considered non-canon by some fans]].

For all versions of the story, including the TV Series, Radio Series, Video Game/Text Adventure, Film, Theatre Plays and Comic Series, see ''Franchise/TheHitchhikersGuideToTheGalaxy''.

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!!''The Hitchhiker's Guide to the Galaxy'' book series provides examples of the following tropes:

* AdaptationalVillainy: The mice. In the original radio show they held no malice towards Arthur at all; on the contrary, they offered to pay him handsomely if he found the ultimate question for them. In the book, they want to cut up his brain to extract the question manually.
* BackingIntoDanger: Parodied in the following passage:
--> Arthur backed down the passageway, feeling increasingly nervous. After a while, he realized that this was because, in every horror movie he'd ever seen, when the hero backs slowly down a passageway, he winds up backing into a monster.
-->At this point he spun round very suddenly, and saw nothing.
-->He started backing down the passageway in the other direction. After a few moments, he realized that he was now backing ''toward'' whatever he had been backing away from in the first place.
-->This, he could not help feeling, was a very foolish thing to do.
** Then he spins around again and winds up face-to-face with a monster.
* EvolutionaryStasis: It is mentioned that the Vogons stopped evolving shortly after they stopped being an aquatic species. The planet Vogsphere has created many other life forms far more appealing than the Vogons, which they inevitably destroy for their own amusement.
** To lampshade it, the book even states that evolution threw up its metaphorical hands in horror at the sight of the Vogons in daylight, refused to let them evolve again, and produced the other, amazingly beautiful creatures of Vogsphere in compensation for the Vogons.
* HappyEndingOverride: Between ''So Long and Thanks For All the Fish" and "Mostly Harmless", Arthur's true love Fenchurch mysteriously disappears in-universe (it's implied that a hyperspace-travel accident caused Arthur to accidentally jump into a timeline where she never existed).
* HumansAreNotTheDominantSpecies: Humans are merely unknowing experimental test subjects being monitored and controlled by other-dimensional beings who assume the forms of white mice. A more profound question is how the dolphins got here and left, since they are also superior to us.
* InUniverseFactoidFailure:
** Ford Prefect chooses his name — the name of a rather mediocre British car — apparently on the assumption that cars were the dominant species on the planet. The movie adaptation extrapolates from this the scene of Ford and Arthur's first meeting, Arthur saving Ford from attempting to shake hands with a car (a Ford Prefect, naturally).
** The Cutaway Gag sequence about the Vl'Hurg-G'Gugvuntt fleet that attempted to invade the Earth, only to be accidentally swallowed by a small dog in its entirety "due to a terrible miscalculation of scale".
* ItRunsOnNonsensoleum: The series' phlebotinum runs entirely on RuleOfFunny. Among other things, we have the Infinite Improbability Drive, Bistromathics -- a field of computations based on the non-absoluteness of the mathematics involved in restaurant dining -- and the Somebody Else's Problem field, a [[StealthInSpace cloaking device]] that weaponizes the WeirdnessCensor by making something appear so ludicrously inconceivable that people just ignore it. There's also the species who built a starship powered by bad news, but nobody wanted it to show up.
* LemonyNarrator: A staple of Douglas Adams' work. The fictional guide itself is also written in this style.
* TheMeaningOfLife: A machine is fed information to calculate the ultimate answer to life, the universe and everything. The answer? [[NonAnswer 42]]. The machine can't calculate the ultimate ''question'', but it can design another machine that might...
* PostWakeUpRealization: Varies from version to version where Arthur is sometimes like this about noticing that there are bulldozers ready to knock down the house he lives in.
-->From the Book: "The word 'bulldozer' wandered through his mind for a moment, in search of something to connect with."
* ProphecyArmor: Arthur's encounter with Agrajag leaves him believing that he can't die until he's visited a planet called Stavromulos Beta, where he ducked to avoid being shot and the shot killed Agrajag instead. It turns out to actually be a nightclub on Earth called "Stavro Mueller's Beta".
* TrilogyCreep: "[[LampshadeHanging The increasingly inaccurately named]] ''Hitchhiker's'' trilogy."
* UnluckyExtra: Agrajag is an unfortunate soul that happens to reincarnate into incidental creatures that Arthur Dent accidentally kills (a pot of flowers, a fly, etc...). Agrajag eventually becomes aware of his past lives and becomes more and more spiteful toward Arthur until his dislike actually materializes into the "Cathedral of Hate", to which he eventually abducts Arthur; thanks to the vagaries of time travel, it turns out that he can't kill Arthur because one of the deaths he wants revenge for hasn't happened yet (it eventually occurs in the final chapter of ''Mostly Harmless''). Arthur proceeds to accidentally kill him again while escaping.
* WhatOtherGalaxies: The Universe is mentioned several times (the Answer to Life, the Universe, and Everything, ''Literature/TheRestaurantAtTheEndOfTheUniverse''), yet no other galaxy is ever acknowledged. To be fair, the Restaurant at the End of the Universe is at the temporal end of the universe, not the physical end.
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