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->"Is such a thing even possible? ''[[AllMythsAreTrue 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, Greek Fire, Stonehedge, 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' 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.
!!This show provides examples of:
* 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 Skulls (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."
* 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.
* 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, and presenting hoaxes as true (such as the infamous Crystal Skulls). 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.
** [[InsaneTrollLogic SHAPESHIFTING aliens, which is why we can't find them: they're disguised as humans.]]
* 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.
* 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!
* OncePerEpisode: At some point during any given installment, the phrase "as ancient astronauts theorists believe/contend/[[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.
* 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.