TV Ancient Aliens - Season 21 Episode 1 : The Top Ten Extraordinary Discoveries Ancient Aliens - Season 21 Episode 1 : The Top Ten Extraordinary Discoveries 7/10 by 287 users Ancient Aliens is counting down ten of history's most astonishing discoveries; breakthroughs that challenge traditional beliefs about human history. From a lost city hidden in the Andes, to mysterious metal spheres that are not of this world and a sunken city that was said to be the home of the gods. Could these discoveries provide proof of extraterrestrial contact? Details Casts Posters Images Title Ancient Aliens - Season 21 Episode 1 : The Top Ten Extraordinary Discoveries 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 First Air Date 2010-04-20 Last Air Date 2025-11-06 Number of Episodes 278 Number of Seasons 21 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 , Narrator (voice) Robert Clotworthy Self Giorgio A. Tsoukalos Self Ariel Bar Tzadok Self Jonathan Young Self David Childress Self Erich von Däniken Self Linda Moulton Howe Self David Wilcock Self George Noory Self Philip Coppens Self Nick Pope Self Mike Bara Self Bill Birnes Self Hugh Newman Self Robert M. Schoch Self Nick Redfern Episodes List Ancient Aliens Season 21 :Episode 1 The Top Ten Extraordinary Discoveries The Top Ten Extraordinary Discoveries 2025-02-07 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 2 The Top Ten Mysterious Monoliths The Top Ten Mysterious Monoliths 2025-02-14 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 3 The Top Ten UFO Crashes The Top Ten UFO Crashes 2025-02-21 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 4 The Top Ten Unexplained Technologies The Top Ten Unexplained Technologies 2025-02-28 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 5 The Top Ten Secret Projects The Top Ten Secret Projects 2025-03-07 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 6 The Top Ten Mysterious Mountains The Top Ten Mysterious Mountains 2025-03-14 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 7 Mysteries of the Aztecs Mysteries of the Aztecs 2025-03-21 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 8 The Glowing Orb Phenomenon The Glowing Orb Phenomenon 2025-03-28 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 9 The Legacy of J. Allen Hynek The Legacy of J. Allen Hynek 2025-08-29 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 10 The Volcano Factor The Volcano Factor 2025-09-05 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 11 The Birdman Mystery The Birdman Mystery 2025-09-12 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 12 The Abduction Files The Abduction Files 2025-09-19 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 13 The Giants The Giants 2025-10-02 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 14 Aliens In Our Midst Aliens In Our Midst 2025-10-09 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 15 Britain's UFO Files Britain's UFO Files 2025-10-16 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 16 Mysteries Of The Norse Gods Mysteries Of The Norse Gods 2025-10-23 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 17 Secrets of Japan Secrets of Japan 2025-11-06 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 18 Skulls of the Gods Skulls of the Gods 1970-01-01 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings... Ancient Aliens Season 21 :Episode 19 Islands of the Gods Islands of the Gods 1970-01-01 Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings...