TV Ancient Aliens - Season 4 Episode 3 : The Greys Ancient Aliens - Season 4 Episode 3 : The Greys 7/10 by 287 users Who are the beings with big heads and giant eyes that seem to have been visiting our planet for millennia? Known by researchers as the "greys," these mysterious beings have been depicted in rock-art and carved stone figures throughout the ages and all over the world. Who are they, what planet do they come from, and what do they want? Details Casts Posters Images Title Ancient Aliens - Season 4 Episode 3 : The Greys 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 4 :Episode 1 The Mayan Conspiracy The Mayan Conspiracy 2012-02-17 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 4 :Episode 2 The Doomsday Prophecies The Doomsday Prophecies 2012-02-17 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 4 :Episode 3 The Greys The Greys 2012-02-24 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 4 :Episode 4 Aliens and Mega-Disasters Aliens and Mega-Disasters 2012-03-02 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 4 :Episode 5 The NASA Connection The NASA Connection 2012-03-09 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 4 :Episode 6 The Mystery of Puma Punku The Mystery of Puma Punku 2012-03-16 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 4 :Episode 7 Aliens and Bigfoot Aliens and Bigfoot 2012-03-23 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 4 :Episode 8 The Da Vinci Conspiracy The Da Vinci Conspiracy 2012-04-06 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 4 :Episode 9 The Time Travelers The Time Travelers 2012-04-27 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 4 :Episode 10 Aliens and Dinosaurs Aliens and Dinosaurs 2012-05-04 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...