History Main / CityPlanet

* ''Fanfic/TheVioletDemon'': Fornax is covered by immense mega-cities of needle-shaped towers and blocky buildings, ruled by a plutocratic oligarchy that focuses its attention on the upper levels while letting with the shadowy, canyon-like lower depths are left to lawless near-anarchy.

* ''WebOriginal/BosunsReturn'': The Earth is described as having become an ecumenopolis in its past, and has been extensively engineered and re-engineered for this purpose. By the story's time, its abandoned ruins consist of several layers of artificial construction, and immense, atmosphere-piercing cooling towers are needed to keep it habitable.

* In ''WesternAnimation/BuckyOHareAndTheToadWars'', the KOMPLEX MasterComputer took over the Road homeworld and completely covered in factories seven layers deep.

* Creator/IsaacAsimov:
** ''Literature/FoundationSeries'':
*** "Literature/ThePsychohistorians": Trantor, capital of the Galactic Empire, has [[TerraDeforming converted every landmass into a single interconnected city]] (making it one of the first depictions of a planet-wide city). Because its population is in the tens of billions, it depended on outer worlds for food. Fleets of ships deliver produce from twenty different [[AgriWorld farm planets]].
--->''"Its urbanization, progressing steadily, had finally reached the ultimate. All the land surface of Trantor, 75,000,000 square miles in extent, was a single city. The population, at its height, was well in excess of forty billions."'' -- ''[[EncyclopediaExposita Encyclopedia Galactica]]''
*** ''Literature/PreludeToFoundation'': Trantor is divided into approximately 800 [[DomedHometown domed cities]], each with [[MulticulturalAlienPlanet their own subcultures]], with some open space in-between used for transportation, communication, cooling towers, etc. The twenty nearest inhabited planets are all agrarian economies whose primary export market is Trantor. (''Prelude'' can be considered Asimov's attempt to [[{{Reconstruction}} reconstruct]] the idea of a planet-wide MegaCity.) Hari Seldon goes on TheQuest to find a model for psychohistory by exploring multiple areas of Trantor.
** In the robot novels, Earth has become a planet of underground or domed "[[CapitalLettersAreMagic Cities]]". There's still wilderness outside, but very few people ever go there, so from the protagonists' point of view, they live on a City Planet. In fact, airplanes no longer have windows because most people are agoraphobic and would have panic attacks during flights if they could see outside of the plane. All of this is contrasted by the Spacers, whose worlds have a very low population density and as a result, they prefer to live on estates with a lot of open space. This presents a real challenge to the agoraphobic protagonist Elijah when he visits the Spacer Worlds. Incidentally, Asimov himself was a claustrophile (i.e. he liked small, enclosed spaces) and hated flying.

* ''Literature/TheStainlessSteelRat Wants You''. The aliens have covered their entire planet this way because they hope to wipe out the humanoid races, but they've adapted by moving into the city and hiding there like stainless steel rats themselves.

* Creator/SheriSTepper:
** ''Literature/{{Beauty}}'': The Earth has had all its wilderness wiped out, followed by any and all crop-growing facilities.
** ''Literature/ShadowsEnd'': The governing planet of an entire solar system is a City Planet.
* ''Literature/UnchartedStars'' has a planet completely covered by city.

** "[[Recap/DoctorWhoS30E8SilenceInTheLibrary Silence in the Library]]"/"[[Recap/DoctorWhoS30E9ForestOfTheDead Forest of the Dead]]": The titular Library is an artificially-constructed library planet. It's been abandoned due to an infestation of [[LivingShadow Vashta Nerada]].

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* Earth briefly in ''Film/AbsolutelyAnything'' when Neil uses his JackassGenie powers to try and end homelessness by wishing that everyone had their dream house. Earth's landmasses end up being entirely covered by houses so Neil undies his wish.

Because SciFiWritersHaveNoSenseOfScale, City Planets tend to have implausibly low populations, even if the number quoted ''seems'' high. Assuming a city literally covered the surface of a planet the size of the Earth, with no large bodies of water or other uninhabited areas, a population of 1 trillion would have a density of around 5000 people per square mile, or five times smaller than that of New York City (and fourteen times smaller than Manhattan). Considering that such sci-fi cities are often said to have [[LayeredMetropolis multiple levels as well]], either fair portions of this "global city" must be largely empty or the planet must have a population density equivalent to that of a rural town. Even assuming that the census data is off doesn't work as you would run into problems overheating the planet once you got past 10 trillion people, still far below having to give people less than 1000 square feet of living space, much more than the cramp conditions shown in most science fiction.

* ''WebOriginal/OrionsArm'' has examples such as [[https://www.orionsarm.com/eg-article/47a67ce4bf7a5 Trip]], [[https://orionsarm.com/eg-article/48866d73905c0 Krutarkilush]] and [[https://www.orionsarm.com/eg-article/58db9b4a098ed Yumika]]. Although Trip isn't 100% urbanized, as it also has suburban and undeveloped areas. The setting has a range of advanced technologies, such as matter-to-energy conversion reactors, which allow these planets to function.

%%* ''WesternAnimation/LoonaticsUnleashed'': The city planet of Acmetropolis.

* Earth briefly in ''Film/AbsolutelyAnything'' when Neil uses his JackassGenie powers to try and end homelessness by wishing that everyone had their drea house. Earth's landmasses end up being entirely covered by houses so Neil undies his wish.

*** In the serial ''Series/TheMandalorian'' season 3, scenes in a park on Coruscant are shown, with an odd rock jutting a fair bit upwards from the "ground". It is actually the very peak of Umate, the tallest mountain on the planet's natural surface, the only part of the natural surface that still is exposed to the sun and sky.

*** Trantor, capital of the Galactic Empire and [[TerraDeforming one vast city]] (also one of the first depictions of this idea), is completely covered by [[DomedHometown domed urban areas]] during the start of the ''Literature/{{Foundation|Series}}'' series. It persists in this image until it is [[RapePillageAndBurn sacked and looted]], which begins its transformation into an [[AgriWorld agrarian world]]. The planet is [[RecycledInSpace based on Rome]], as described by Creator/EdwardGibbon's ''Literature/TheDeclineAndFallOfTheRomanEmpire''. AncientRome was the world's largest metropolis, with a population of over a million people, something which would not be matched again until 19th Century London. UsefulNotes/TheRomanEmpire had so many people at the capital that it could not sustain itself with only local agriculture, so food was constantly imported from northern Africa (at first from Egypt, then from what is now Tunisia and Algeria) to supply the city. The seat of government was forced to relocate to Constantinople due to [[WhenRomeBurns Rome being burned down]]. Trantor is likewise overpopulated, with a population of 40 billion. It is dependent on imports of food from other planets (specifically twenty [[AgriWorld Farm Planets]]), which made it vulnerable to a [[GalacticConqueror space warlord]] coming along to conquer the capital. The "emperors" evacuate and move to Neotrantor, ruling only a few dozen worlds.
*** "Literature/ThePsychohistorians": Trantor has [[TerraDeforming converted every landmass into a single interconnected city]] (making it one of the first depictions of a planet-wide city). Because its population is in the tens of billions, it depended on outer worlds for food. Fleets of ships deliver produce from twenty different [[AgriWorld farm planets]].