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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 to continued mass sightings in the US, each episode gives historic depth to the questions, speculations, provocative controversies, first-hand accounts and grounded theories surrounding this age old debate.
Season 1
5 Episodes
April 20, 2010
Season 2
10 Episodes
October 28, 2010
Season 3
16 Episodes
July 28, 2011
Season 4
10 Episodes
February 17, 2012
Season 5
12 Episodes
December 21, 2012
Season 6
11 Episodes
September 30, 2013
Season 7
8 Episodes
January 24, 2014
Season 8
8 Episodes
June 13, 2014
Season 9
12 Episodes
October 31, 2014
Season 10
10 Episodes
July 24, 2015
Season 11
15 Episodes
May 6, 2016
Season 12
16 Episodes
April 28, 2017
Season 13
15 Episodes
April 27, 2018
Season 14
22 Episodes
May 31, 2019
Season 15
12 Episodes
January 25, 2020
Season 16
10 Episodes
November 13, 2020
Season 17
7 Episodes
August 5, 2021
Season 18
20 Episodes
January 7, 2022
Season 19
20 Episodes
January 5, 2023
Season 20
20 Episodes
January 4, 2024
Season 21
17 Episodes
February 6, 2025
Season 22
15 Episodes
January 15, 2026
In every corner of the world, archaeologists have found strange, elongated skulls. Did our ancestors modify the shape of their skulls to resemble extraterrestrials? And might it even be possible that some of these skulls are of otherworldly origin?
High above the Giza Plateau stands Egypt's most mysterious ancient site: the Lost Pyramid of Abu Rawash; today, it lies in ruins, but some researchers believe these stone blocks hold profound secrets about an extraterrestrial civilization that existed in ancient Egypt long before our recorded history.
In the western Pacific Ocean is a vast area known as Oceania that is home to the world's most remote and mysterious islands. They are known for massive stone structures, statuary strange figures, and countless legends of otherworldly visitors. Could it be that these islands are the remnants of a lost alien civilization?
Host Giorgio Tsoukalos probes the series archives to explore remarkable ancient structures that defy conventional explanation. From the precisely cut stone blocks at Puma Punku, to the gigantic temples of Malta, and the megalithic city of Nan Madol, could these mysterious sites contain evidence of extraterrestrial contact in the distant past?
Found along the California coast to New York’s Hudson Valley, and Northern England to Southern Chile, could these mysterious locations provide evidence of an extraterrestrial presence on Earth?
From a stone circle in Turkey that challenges the timeline of human history to gigantic stone spheres in Bosnia and Egypt’s most unusual tombs, could these monuments provide proof of extraterrestrial visitation?
The oceans are the most mysterious places on Earth. Countless legends tell of powerful beings living in the waters, and today they are major hotspots for UFOs. Is it possible that the deepest depths of our planet—are home to otherworldly beings?
Ancient scriptures called the Vedas form the foundation of Hinduism. These manuscripts are thousands of years old and describe a time when Earth was inhabited by gods who traveled the skies in flying machines and possessed extraordinary technology. Might the secrets of the Vedas reveal the truth about extraterrestrial contact in the distant past?
Ancient legends describe a war in heaven that was fought by otherworldly beings with extraordinary weapons. Is it possible that our planet still bears the scars of battles fought by extraterrestrials?
Host Giorgio Tsoukalos probes the series archives to present the most compelling UFO SIGHTINGS. From footage of extraordinary aircraft taken by fighter pilots to a strange object filmed flying over a military base in Iraq and mysterious glowing orbs that are reported all over the world, are these remarkable sightings evidence of extraterrestrial visitation?
The rapid development of artificial intelligence has made it a powerful tool for historians and archaeologists. But might it also reveal evidence of an extraterrestrial presence on Earth?
Host Giorgio Tsoukalos examines series archives to investigate theories of historical extraterrestrial contact; the broadcast reviews aerial geoglyphs, crop circles and mathematical codes embedded in ancient global architecture to assess claims of early astronomical communication.
A documentary examines how researchers utilize remote-sensing technology, such as lidar, to map previously undocumented ancient urban networks beneath the Amazon canopy; the broadcast investigates alternative history theories regarding potential extraterrestrial influence at these newly mapped archaeological sites, evaluating whether the design of these pre-Columbian settlements aligns with ancient astronomical patterns or cosmic structures.
Host Giorgio Tsoukalos opens the series archives to celebrate ALIEN INVESTIGATORS that have been brave enough to ask the question, "Are we alone in the universe?" Could these investigators have uncovered proof of an alien presence on earth?
The origins of humanity can be traced back to Africa, and some of the oldest religious traditions across the continent describe mysterious beings who descended from the sky in thunderous vehicles. Could it be that the ancient mythology of Africa describes our first encounters with extraterrestrials?
