If extraterrestrials influenced human history, can evidence of their existence be found in hidden tunnels and caverns around the world? Could a cave in Ecuador contain metallic books inscribed with secrets of alien technology? Was an ancient underground city in Turkey built with alien help... or as a refuge from an alien attack? Rumors of the U.S. military working alongside aliens in a secret base inside a mesa in New Mexico continue to swirl, Native American legends mention strange inner-Earth beings, and recent archaeological discoveries in the Yucatan may point to an extraterrestrial reality behind.
| Title | Ancient Aliens - Season 2 Episode 4 : Underground Aliens |
|---|---|
| Alternative Titles | Nos ancêtres les extraterrestres, 远古外星人, Ancient Aliens - Neue Erkenntnisse, Generacion alien, Alienígenas ancestrales, Alien Theory, 古代の宇宙人, Goście z Przeszłości, Drevni vanzemaljci |
| Subtitle Available |
 ETC.
|
| First Air Date | 2010-04-20 |
| Last Air Date | 2026-01-22 |
| Number of Episodes | 285 |
| Number of Seasons | 22 |
| Genres | Documentary, Mystery, Sci-Fi & Fantasy, |
| Networks | History, |
| Casts | Robert Clotworthy, Giorgio A. Tsoukalos, Ariel Bar Tzadok, Jonathan Young, David Childress, Erich von Däniken, Linda Moulton Howe, David Wilcock, George Noory, Philip Coppens, Nick Pope |
| Plot Keywords | , |
Episodes List
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Ancient Aliens Season 2 :Episode 1 Mysterious Places Mysterious Places
2010-10-28Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings...
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Ancient Aliens Season 2 :Episode 2 Gods & Aliens Gods & Aliens
2010-11-04Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings...
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Ancient Aliens Season 2 :Episode 3 Underwater Worlds Underwater Worlds
2010-11-11Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings...
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Ancient Aliens Season 2 :Episode 4 Underground Aliens Underground Aliens
2010-11-18Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings...
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Ancient Aliens Season 2 :Episode 5 Aliens and the Third Reich Aliens and the Third Reich
2010-11-25Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings...
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Ancient Aliens Season 2 :Episode 6 Alien Tech Alien Tech
2010-12-02Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings...
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Ancient Aliens Season 2 :Episode 7 Angels and Aliens Angels and Aliens
2010-12-09Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings...
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Ancient Aliens Season 2 :Episode 8 Unexplained Structures Unexplained Structures
2010-12-16Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings...
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Ancient Aliens Season 2 :Episode 9 Alien Devastations Alien Devastations
2010-12-23Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings...
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Ancient Aliens Season 2 :Episode 10 Alien Contacts Alien Contacts
2010-12-30Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings...
