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->"Is such a thing even possible? ''Yes, it is!''"
-->-- '''Giorgio A. Tsoukalos'''

To go along with Creator/TheHistoryChannel's NetworkDecay, ''Ancient Aliens'' is a program that deals with conspiracy theories about aliens. Taking a glance at a list of episodes reveals that--as far as this show is concerned--aliens did ''everything''. No, really, ''everything''--they exterminated the dinosaurs, they influenced all major religions, and they were in contact with all ancient cultures. Nazis, the Old West, {{Atlantis}}, GreekFire, Stonehenge, King Arthur, all influenced by aliens.

The show is known for having frequent appearances by [[http://en.wikipedia.org/wiki/Giorgio_A._Tsoukalos Giorgio A. Tsoukalos]], consulting producer and ancient astronaut researcher. More specifically, it's known for the involvement of Giorgio A. Tsoukalos' [[AnimeHair hair]].

In July 2014, it received a pseudo spin-off called "''In Search of Aliens''", hosted exclusively by Tsoukalos as he explores the globe looking for evidence of aliens. It's just as outlandish and silly as the original; for example, offering the theory the Loch Ness Monster is an alien craft docking at an alien base built beneath the lake.
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!!This show provides examples of:

* AdvancedAncientHumans: Usually from alien assistance. The ancient Egyptians, for example, are claimed to have a central power network from the obelisks that dot their empire.
* AgentMulder: Many of the experts, but particularly Giorgio, who appears in every episode and seems to think aliens are responsible for every aspect of human history and beyond.
* AllMythsAreTrue:
** Albeit aliens were involved with all of them. Yes, ''all'' of them--an episode involving the {{Crystal Skull}}s (which have been thoroughly debunked) explored the idea of them having mystical science powers or alien knowledge encoded in them, and somehow managed to link them to the Nazis, {{Atlantis}}, the Dali Lama, and Native American mythos. That's just how absurd the show can be when it tries. A 2014 commercial for the series even directly states "Aliens were part of everything. Now you know."
** They will occasionally admit that mainstream (read: real) archaeologists have an answer for the "mystery," or that some of the claims have been proved hoaxes ({{crystal skull}}s, {{crop circles}}). It's usually followed immediately with something like "But ancient astronaut theorists have a different, more profound, explanation."
* UsefulNotes/TheAmericanCivilWar: As part of the show increasingly reaching for alien connections, a Season 7 episode claimed that aliens intervened in the Civil War as well.
* AncientAstronauts: Prescribes to this, using scripture and myths. Pretty much any instance of gods, angels, demons, spirits, etc, was ancient people meeting aliens and misunderstanding them.
* ArtisticLicenseEngineering: Almost every single argument made by the show's sources can essentially be boiled down to the claim that Ancient civilizations could not have had any way to build the impressive structures they left behind - while conveniently ignoring every tool or practical knowledge historians have learned about of these civilizations.
** The most blatant and probably oft cited argument is that ancients could never have cut, moved, shaped, or lifted some form of stone without lasers, levitation, diamond saws, or whatever. This despite the fact you could literally do most of the work with stone tools, wood, sand, pure human labor, and a little bit of ingenuity.
* BlatantLies: The ''entire'' show. All the lies and deception are picked apart by ''[[http://www.youtube.com/watch?v=j9w-i5oZqaQ Ancient Aliens Debunked]]''. Notable is presenting 19th and 20th century New Age texts as ancient texts, deliberate mistranslations, deliberately presenting false dates, not citing actual sources, quote mining, cherry picking data, and presenting hoaxes as true (such as the infamous {{Crystal Skull}}s). All and all, the show is one big ''lie'' that is getting far, far too much attention.
* BeethovenWasAnAlienSpy:
** Anyone with ideas ahead of their time either had contact with aliens or was exposed to alien technology left on earth.
** With LeonardoDaVinci, they think that he was either kidnapped by aliens, or even was actually a ''time traveler''.
* TheBermudaTriangle: This along with Japan's "Dragon's Triangle" are theorized to be portals which UFO's travel through to get to Earth.
* BigfootSasquatchAndYeti: They're aliens, too. Alien made hybrids of humans and something else.
** Or they're [[InsaneTrollLogic SHAPESHIFTING aliens, which is why we can't find them: they're disguised as humans.]]
** [[MultipleChoicePast OR]] they are the natural creatures who evolved on Earth and humans are the engineered hybrids. Bigfoot hides because we scare it.
* CargoCult: All religions are this, in their minds. They've even [[DiscussedTrope specifically mentioned this trope]] in their explanations.
* CreativeSterility: The hosts of the show basically assume that ancient man had no imagination. All myths, legends, etc, were attempts by our ancestors to accurately record things they saw and experienced first-hand. They just didn't have the technological sophistication to realize they were seeing aliens and machines, not gods and magic.
** They also seem to believe there is no such thing as true genius. As mentioned above, anyone who had radical ideas (Leonardo, Einstein, von Braun) must have been influenced by aliens. They never seem to consider the possibility that these people were visionaries who benefited mankind with their own brainpower.
* DanBrowned: A staple of this show. About ten minutes research on some of the subjects they cover will turn up evidence that they're twisting facts, if not outright lying.
* EarlyInstallmentWeirdness: The series is actually a SpinOff from a one-off documentary that presented a much less biased examination of the Ancient Astronaut theory; both proponents and detractors were interviewed. Myths were not presented as evidence. Artistic licence and symbolism were acknowledged. It should come as no surprise that, by presenting ''both sides'' of the argument with evidence ''for and against'', the result is far more reasonable.
* ETGaveUsWiFi: Along with a good chuck of technological innovations throughout history.
* ForTheEvulz: Aliens apparently cause volcanic eruptions and earthquakes. Why they're doing it and what they would have to gain from doing it isn't known or dwelled upon in the show.
* TheGreatFlood: The show takes the Noah's ark story as the literal truth. But aliens did it.
* TheGrimReaper: According to the show the black death was caused by Grim Reaper aliens with plague [[SinisterScythe scythes]]. Seriously.
* GroupieBrigade: According to pics, Giorgio A. Tsoukalos is quite the KavorkaMan. It's gotta be the [[EinsteinHair hair]].
* ImprobableHairstyle: The famous hair of Giorgio Tsoukalos. [[http://www.legendarytimesbooks.com/image.php?type=T&id=866 Exhibit A]].
* InsaneTrollLogic: As picked apart in [[http://blogs.smithsonianmag.com/dinosaur/2012/05/the-idiocy-fabrications-and-lies-of-ancient-aliens/ this spectacular takedown of the show]], written by [[ArtisticLicensePaleontology a scientist]] who understands the topic of the week inside and out.
** The commentators, especially Philip Coppens, likes to suggest the possibility that aliens may have been behind something, then in the next sentence, pretend like the possibility is itself proof of their claims.
* LogicalFallacies: The main one showing up all the time is the ConverseError Affirming the Consequent.
-->1. If aliens really existed and visited Earth, they could theoretically have shown humans how to build pyramids.
-->2. Humans built pyramids.
-->3. Therefore, aliens!
* LostTechnology: A number of artifacts, like the [[https://en.m.wikipedia.org/wiki/Antikythera_mechanism Antikythera mechanism]], are claimed to be this. Alternately, several ancient sites, especially [[https://en.m.wikipedia.org/wiki/Pumapunku Pumapunku]], were made using Lost Technology.
* OncePerEpisode: At some point during any given installment, the phrase "as ancient astronauts theorists believe/contend/argue/[[DepartmentOfRedundancyDepartment theorize]]" will be uttered at least once. This functions more or less as a disclaimer or possibly a CatchPhrase.
* PhlebotinumKilledTheDinosaurs: Yup, the aliens apparently offed them, too. Oh, and they made them in the first place as well.
* {{Satan}}: Yup, he was an alien, too.
* SciFiWritersHaveNoSenseOfScale:
** SciFiWritersHave/NoSenseOfDistance: Aliens come from stars tens to hundreds of light years away to mine gold (a relatively common metal in asteroids) on Earth, where the total amount of gold mined in the entirety of Earth's history was estimated as of 2011 to be about 171,300 tonnes, enough to form a cube just over 20 meters to a side.
* SequelEscalation: The first couple of seasons weren't too bad. Angels were aliens, the Nazis studied alien technology, the Egyptians and the Aztecs were visited by aliens, the Bermuda Triangle is aliens; in short, nothing that numerous other programs hadn't suggested before. Then the later seasons really got carried away. The first episode of season three being titled "Aliens and the Old West" is your first clue that things are about to go downhill.
* ShoutOut: One theory mentioned a few times but never really discussed seriously is the idea aliens come to Earth to hunt the most dangerous predators on the planet, [[{{Film/Predator}} humans]].
* SpeculativeDocumentary: Basically, everything important happened because of aliens.
* StupidJetpackHitler: They do this in a few episodes. The Nazis were all over studying aliens and their technologies left behind on earth.

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