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Examining possible evidence of 20th-century alien contact, including a 1942 aerial battle over Los Angeles and reports of a 1947 UFO crash in Roswell, N.M.

Ancient Aliens

The Return

Ancient people described monsters and visitors from the sky; these beings might be aliens, or the product of alien experimentation on humans.

Ancient Aliens: Special Edition

Faces of the Gods

Reports of encounters with strange beings and UFO sightings have occurred throughout history; a 13th-century history book depicts a creature descending from a craft; medieval art represents disc-shaped objects in the heavens.

Closer Encounters

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.

The Mission

Structures and artifacts throughout the world point to advanced technology in the distant past; exploring the possibility that alien technology may have helped ancient humans.

Mysterious Devices

Investigating possible historic evidence and beliefs around the globe in search of signs that aliens visited ancient Earth; Hopi and Zuni Indians celebrate Kachina sky gods; the Chinese legend of Huangdi arriving on Earth on a flying dragon.

The Visitors

The theory that alien technology helped ancient humans build megalithic stone structures.

Mysterious Structures

Examining stories of strange objects witnessed by ancient cultures and written in mythology and texts.

Alien Transports

Searching for clues about whether aliens visited ancient Earth in Indian Sanskrit texts, megalithic stone structures in Egypt and Jewish Zohar writings.

The Evidence

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Texts, archaeology and legend contain evidence of past human-extraterrestrial contact.

S1 E2 | Mysterious Structures