—Investigators circle the globe in search of evidence in their quest to determine whether life on Earth began in outer space and if aliens influenced mankind in ancient times. Did extraterrestrial beings visit Earth and share information about technology and influence human religions? And more importantly, if aliens visited the planet before, will they return? Alien theorists believe that the answer to both questions is a resounding yes.

10 seasonsFree episode availableDocumentary, ParanormalTV-PG

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Season 2020 of 20 Episodes

Giorgio Tsoukalos looks at mysterious teachers who have appeared throughout history, including a biblical patriarch, a race of fish-people and Egypt's most controversial Pharaoh.
Giorgio Tsoukalos takes a look back at the top 10 reports of encounters with strange and mysterious beasts that have been investigated on "Ancient Aliens."
Counting down the top 10 locations around the world that may be hiding alien bases, including a cavern beneath the ice of Antarctica, a lake in China that is a hotspot for UFOs, and a pyramid under the slopes of Mount Denali.
Counting down the top 10 scariest encounters that just might be evidence of extraterrestrial visitation, from an encounter in rural Texas that left onlookers with unexplainable injuries, to mysterious cattle mutilations, and more.
Counting down 10 intriguing symbols and codes found across the globe that might contain proof of otherworldly contact; from glyphs in the Peruvian desert, to spiral petroglyphs embedded with advanced math, and a language with an unexplained origin.
Counting down the top 10 devastating disasters that might have an otherworldly connection; from a flying monster at a nuclear incident, a meteor that wiped out the dinosaurs, and a deadly virus that might be from another world.
More than 7,000 years ago, the ancient Sumerians established what is considered the world's first civilization; but it may be possible that these powerful beings were, in fact, extraterrestrial visitors.
Along the Earth's north 37th parallel, there have been so many reports of unidentified flying objects, animal mutilations, and other mysterious events that it has been dubbed The UFO Superhighway.
For thousands of years, Scotland has been an epicenter of otherworldly phenomena; it is home to mysterious ancient stone circles, stories of strange beings, and is a major hotspot for UFO sightings.
Throughout the world there are mysterious ancient stones shaped into perfect spheres; many of them show clear evidence of being manmade and some completely defy explanation; the mystery of the stone spheres could provide clues about humankind's past.
Considered by many to be the greatest civilization in the history of the Americas, the Maya thrived for more than 2,000 years; today new evidence is being discovered that completely upends our understanding of this ancient culture, and might provide evidence that the Maya came in contact with extraterrestrial visitors.
For thousands of years, cultures around the world have held a belief in stargates through which beings have traveled to Earth from distant points in the universe and even other dimensions.
For decades, incredible claims have been made about an extraterrestrial presence on Earth, and the government has gone to great lengths to discredit them.
For thousands of years, humankind has attempted to make contact with beings from beyond Earth; now, the search for extraterrestrial intelligence is ramping up, with new technologies allowing individuals to explore the universe.
On Jacques Vallee's work in the field of UFOs and his theories on alien life.
Stories of god-like beings providing instruction to early humans, helping establish the first civilizations; exploring if mysterious figures who appear throughout history provide evidence that these otherworldly teachers have been here all along.
Deep beneath the sands of Egypt lie 24 enormous sarcophagi, and every one of them is empty; discussing what purpose those giant tombs had served.
For more than four decades, award-winning journalist Linda Moulton Howe has covered the most mysterious phenomena on Earth. Could her investigations on everything from bizarre animal deaths to crop formations and alien abductions lead us to a profound new reality?
From biblical patriarchs to modern day alien abductees, throughout history, there have been people who claimed to have contact with otherworldly beings; often bearing important messages for humanity.
Puma Punku in Bolivia features stone blocks, each carved with precision; the blocks lie scattered across the landscape, confusing archaeologists as to what the ancient site might have been.

According to the earliest Tibetan traditions, Shambhala, the kingdom of the gods, is hidden high in the Himalayas; examining if it's possible that this mystical realm truly exists.
Upcoming
The mysterious symbol of the keyhole exists in mystic texts, sacred architecture and ancient artwork found all over the planet; exploring if this cryptic shape represents a profound connection to the cosmos.
Upcoming
Strange evidence in cultures throughout history indicates aliens came to Earth on missions to explore, obtain raw materials, experiment on humans and conquer; Sumerian tablets describe an alien race; Egyptian hieroglyphs depict hybrid creatures.
Upcoming
Investigating whether angels might really be travelers visiting Earth from distant planets.
Upcoming
Children being born on Earth today can access their alien DNA to utilize special gifts and the power to transform society.
Upcoming
In numerous sacred traditions, the number 12 holds a divine significance; it can be found repeated in ancient architecture, groups of 12 wisdom keepers and even the latest scientific principles.
Upcoming

Investigators circle the globe in search of evidence in their quest to determine whether life on Earth began in outer space and if aliens influenced mankind in ancient times. Did extraterrestrial beings visit Earth and share information about technology and influence human religions? And more importantly, if aliens visited the planet before, will they return? Alien theorists believe that the answer to both questions is a resounding yes.

Robert Clotworthy, Giorgio Tsoukalos, Erich von Däniken, David Childress, William Henry, Linda Moulton Howe, David Wilcock, Jonathan Young, Jason Martell

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In numerous sacred traditions, the number 12 holds a divine significance; it can be found repeated in ancient architecture, groups of 12 wisdom keepers and even the latest scientific principles.

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Ancient Aliens

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