''Childhood's End'' is a novel by Creator/ArthurCClarke, originally published in 1953 (but based off of a 1950 short story of his). The plot concerns the BenevolentAlienInvasion of an alien race called the Overlords. After stopping the UsefulNotes/ColdWar and establishing a world government, they start to maintain peace on Earth, but refuse to show any images of themselves for fifty years. Humanity enters a golden age, before spoilery events happen. Yeah, you can't read much more than that without the ''entire'' plot being given away.

As suggested by the title, the main theme of the book is the end of humanity's "childhood" into a new era.

{{Shout Out}}s to it in fiction are not uncommon, ranging from some in ''Series/StargateSG1'' and ''VideoGame/{{Xenogears}}'' to the cover of Music/LedZeppelin's ''Houses of the Holy", and the Music/{{Genesis}} song "Watcher Of The Skies".

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!!Tropes Used:
* AdaptationExpansion: The first part of the novel is basically a slightly-altered retelling of Clarke's short story "Guardian Angel". The second and third parts are original, about what happens after.
* AlternativeNumberSystem: It is mentioned in passing that the Overlords count in base 14 (their hands have five fingers and two thumbs).
* AncientAstronauts: The myths aren't from memory, but precognitive visions of the demonic-looking aliens.
* AscendToAHigherPlaneOfExistence: [[spoiler:The current generation of humans will be the last one- and with them, human civilization will cease to exist. As all their children born from that moment on were no longer human and will then mind-meld and ascend into a higher form of consciousness that transcends material bodies. Ultimately, that is the fate of ''all'' sentient races, except those that are "stuck"]]
* AssimilationPlot
** [[spoiler:Ever wondered where ''Anime/NeonGenesisEvangelion'' got the whole Instrumentality sequence from?]] Now you know!
* BeastlyBloodsports: The Overlords state their objection to killing animals for entertainment. They put teeth into this pronouncement by causing every member of the audience to actually ''feel'' the bull's pain at what, for obvious reasons, is the last bullfighting event for the humans.
* BittersweetEnding, bordering on DownerEnding
* BizarreBabyBoom: Aliens show up shortly before a bizarre ''new'' generation of humans appears, but they didn't actually cause it.
* BlueAndOrangeMorality
* CultureChopSuey: The tremendous leaps in technology brought about by the Overlord as well as mass migration policies resulted in populations effortlessly moving and mixing all over the planet, negating the former countries as nothing more than postal addresses. On the other hand, this hasn't really removed cultural differences and national identities; the Royal Guard in London still dutifully oversees Buckingham Palace.
* CreepyChild: The telekinetic children.
* DarkIsNotEvil: The [[spoiler:demon-like]] aliens were actually the ''good'' guys... [[spoiler: The reason we thought they were evil and used them in our mythologies as such, was mostly because of a sort of species-wide premonition - we now realized that their very own appearance would be a sign of our 'end as a physically corporeal species']].
* DrivenToSuicide: [[spoiler:Upon learning the truth about the Overlords' purpose on Earth, some choose to take their own lives rather than live through civilization's downfall. The leader of the island community in particular does so by detonating a nuclear device.]]
* EndOfAnAge: Following a variation on the theme, setting is pure ScienceFiction instead of the usual fantasy.
* EvolutionaryLevels
* GainaxEnding: Indeed, probably one of the most direct inspirations for the TropeNamer.
* GeneticMemory: Discussed then inverted.
* TheGreatPoliticsMessup: Semi-averted, see OrwellianRetcon below.
* HiddenElfVillage: Sort of. A group of people led by a Jewish entrepreneur decide to set up an independent society on a group of islands in the Pacific, using only whatever technology they see useful to get by. The Overlords however are perfectly aware of its existence but let it be [[spoiler:as the birth of mankind's next step in evolution would make the debate moot anyway]].
* HiveMind: A big galaxy-spanning one!
* HumanoidAliens
* HumansAreCthulhu: [[spoiler:It's revealed by the Overlords that part of reason why they're helping mankind join the Overmind is that either humans would destroy their own successors...or unleash ''something'' that would threaten the cosmos.]]
* HumansNeedAliens: Humanity AscendsToAHigherPlaneOfExistence via the help of a BenevolentAlienInvasion.
* LastOfHisKind: {{Lampshaded}}. "He had always been a good piano player, and now he was the best in the world."
* NoOSHACompliance: The Overlord's planet. [[JustifiedTrope Justified]] in that, since the Overlords can fly on their world, they don't need things like railings or easily accessible exits.
* OldShame: He mentions in the Millennial edition that he wrote this when he still had a belief in the paranormal.
* OminousFloatingSpaceship most likely the TropeMaker, certainly a contender for the UrExample, were it not for Clarke's own comments that the Trope is older.
* OrwellianRetcon: Clarke wrote a new first chapter after the UsefulNotes/ColdWar had ended.
* OutgrownSuchSillySuperstitions: Every religion (besides Buddhism) is then discredited.
* PsychicPowers: The new generation of babies start showing various forms of these. Most notably, telekinesis.
* TheEndOfTheWorldAsWeKnowIt: [[spoiler:Earth and ''everything'' on its surface become pure energy for the new generation's journey to join the Overmind]]
* TheSingularity
* SpaceWhaleAesop: Stop killing animals and ruining earth's environment because [[spoiler:you're evolving into a new galactic form that will ''eventually'' ruin the Earth anyway!]]
** And oddly enough, a sperm whale diorama sent into space figures into the plot.
* TheGodsMustBeLazy: [[spoiler:They'll just send another alien race to do their bidding]].
** Actually [[JustifiedTrope justified]], as it's stated that [[spoiler: the Overmind]] has tried to directly interact with other species' development...only to fail spectacularly.
* TitleDrop: Not directly, but the last third of the book is about the [[spoiler: the end of both individual children's lives and the 'end of childhood' for humanity as a species, as they ascended to a higher plane of existence... to be part of another alien's mind.]]
* TrojanHorse: The diorama.
* UnitedNationsIsASuperpower: The UN, under the "guidance" of the Overlords becomes this in the immediate years after their arrival. Eventually, it becomes a OneWorldOrder.
* VichyEarth: Crossed with OneWorldOrder, but ultimately subverted.
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