The BEST Episodes of Ancient Aliens

Every episode ever - ranked by fan votes!

Last Updated: Oct 9, 2020

Network: History

Ancient Aliens explores the controversial theory that extraterrestrials have visited Earth for millions of years. From the age of the dinosaurs to ancient Egypt, from early cave drawings to continued mass sightings in the US, each episode in this hit HISTORY series gives historic depth to the questions, speculations, provocative controversies, first-hand accounts and grounded theories surrounding this age old debate. Did intelligent beings from outer space visit Earth thousands of years ago?

The Alien Protocols

#1 - The Alien Protocols

Season 13 - Episode 3 - Aired May 11, 2018

In 2017, a strange, cigar-shaped object enters the solar system from another star system, traveling in such an unusual trajectory it causes some astronomers to suggest that it could be an extraterrestrial craft.

star 8.06
278 votes
The Genius Factor

#2 - The Genius Factor

Season 7 - Episode 4 - Aired Nov 21, 2014

Throughout history, many of the world's greatest thinkers have helped push civilization forward with their profound insights and extraordinary abilities. But the majority of these master minds say their brilliance comes from a place they don't understand-and arrives at times they're not expecting it. In antiquity, people in nearly every culture around the world believed they did not possess genius, but that genius possessed them, like a spirit. Could it be that the forces of inspiration that the ancients attributed to the gods really did emanate from an otherworldly ...

star 7.96
201 votes
Earth Station Egypt

#3 - Earth Station Egypt

Season 13 - Episode 7 - Aired Jul 20, 2018

Ancient astronaut theorist Giorgio A. Tsoukalos explores the latest scientific discoveries at some of the world's most ancient places to find evidence that extraterrestrials visited Egypt in the distant past.

star 7.93
212 votes
The Artificial Human

#4 - The Artificial Human

Season 13 - Episode 13 - Aired Aug 31, 2018

A look at whether or not intelligent robots are a threat to humanity or the next step in human evolution; as man and machine begin to merge, humanity could be fulfilling a destiny prepared for by aliens thousands of years ago.

star 7.92
179 votes
The Alien Phenomenon

#5 - The Alien Phenomenon

Season 13 - Episode 14 - Aired Jan 4, 2019

Erich von Däniken's "Chariots of the Gods?" suggests that aliens visited Earth in the distant past, and there are those who believe that he will be proven right.

star 7.90
138 votes
Aliens and the Secret Code

#6 - Aliens and the Secret Code

Season 3 - Episode 13 - Aired Oct 19, 2011

Megalithic monuments linked together by electromagnetic energy... Prehistoric ruins arranged across vast distances in straight lines... And advanced mathematics carved into landmarks more than 5000 years ago. Were ancient man's spectacular structures built by humans alone? Or do they bear evidence of being designed--and interconnected--by otherworldly visitors?

star 7.85
732 votes
Directors: Kevin Burns
Writers: Kaylan Eggert; Rich Monahan
Aliens and Superheroes

#7 - Aliens and Superheroes

Season 6 - Episode 19 - Aired Aug 22, 2014

From the beginning of recorded history, humans have told stories about beings with super-human strength, super-sonic speed, and supernatural abilities. The ancients had heroic tales about Zeus, Thor, and Hanuman while today we have superhero stories about Superman, Batman, and Spider-man. Mythologists say these epic stories resemble each other because they may have all come from a common set of oral legends created eons ago by our earliest ancestors. But might there be another, more otherworldly reason that the world's heroic myths are so similar? Is it possible, as many Ancient Astronaut Theorists contend, that these stories are actually based on extraordinary-- and possibly extraterrestrial--beings that lived on Earth in the distant past?

star 7.83
173 votes
The UFO Conspiracy

#8 - The UFO Conspiracy

Season 13 - Episode 1 - Aired Apr 27, 2018

In 2017, news breaks that the Department of Defense recently spent millions investigating reports of UFOs; the latest disclosure about a series of secret government UFO projects dating back decades.

star 7.83
301 votes
Aliens Among Us

#9 - Aliens Among Us

Season 7 - Episode 3 - Aired Nov 14, 2014

There are those who believe that the evolution of technology is not entirely of our own making. Ancient Astronaut theorists contend that it is by extraterrestrial design that we have become so technologically interconnected--and that we are being watched by beings from beyond our world. Do stories from the ancient past hold evidence of alien overseers? The Book of Enoch describes divine entities called the Watchers descending to Earth to monitor humankind and aid in our advancement. Inca legend states that the god Viracocha created humans and taught them astronomy,

star 7.82
250 votes
Secrets of the Exoplanets

#10 - Secrets of the Exoplanets

Season 14 - Episode 22 - Aired Nov 29, 2019

Examining some of the thousands of potentially habitable exoplanets discovered over the past 20 years and whether some of them could be home to intelligent extraterrestrial life.

star 7.82
127 votes
City of the Gods

#11 - City of the Gods

Season 12 - Episode 7 - Aired Jun 9, 2017

Researchers suggest that the ancient site of Teotihuacan in central Mexico was once home to a highly advanced, perhaps extraterrestrial, civilization; excavations at Teotihuacan have unearthed discoveries out of place in the ancient world.

star 7.81
487 votes
The Da Vinci Conspiracy

#12 - The Da Vinci Conspiracy

Season 4 - Episode 8 - Aired Apr 6, 2012

Might an examination of Leonardo Da Vinci's masterful paintings, highly technical hand-drawn sketches, and private journals reveal knowledge of otherworldly technology and extraterrestrial beings?

star 7.80
719 votes
Aliens and the Founding Fathers

#13 - Aliens and the Founding Fathers

Season 3 - Episode 11 - Aired Oct 5, 2011

What is the meaning behind secret messages found throughout Washington, D.C.? Did America's Founding Fathers know something about ancient aliens that the general public did not? And if so, could this knowledge have been incorporated into the symbols, architecture, and even the founding documents of the United States of America?

star 7.79
650 votes
Directors: Kevin Burns
Writers: Max Thompson
The Great Flood

#14 - The Great Flood

Season 7 - Episode 8 - Aired Dec 23, 2014

It is a story told in more than twelve hundred cultures around the world–the gods sent a great flood to wipe out humanity for its disobedient and wicked ways. Do these numerous creation myths point to an actual deluge, one that engulfed the world and spared only a chosen few? New evidence suggests that many fabled aspects of these flood myths may, in fact, be true. From traces of a major meteor impact in the Indian Ocean, to a worldwide ash layer, and even remnants of Noah’s grave site, scientists are starting to put the pieces of a very deadly puzzle together–a puzzle that some believe was created by extraterrestrial beings. Did humanity narrowly escape extinction? And are the ancient stories correct–that alien beings are the reason we survived? Ancient Astronaut Theorists believe they are–and that celestial beings are poised to save us again when another catastrophe sweeps across the Earth.

star 7.79
239 votes
Voices of the Gods

#15 - Voices of the Gods

Season 12 - Episode 11 - Aired Jul 21, 2017

India's Sanskrit texts are filled with incredible stories about advanced technology in the ancient world. Highly complex building techniques, brain surgery, flying crafts, and even nuclear physics are described with uncanny accuracy. Hindu scholars attribute this knowledge to a time when "gods" walked among men. Might this period of time actually be referring to an age when extraterrestrials inhabited the planet? Giorgio A. Tsoukalos travels to India to further explore the Sanskrit texts, as well as the structures and technology that have stood the test of time. From a temple that inexplicably survived a major earthquake to evidence of ancient brain surgery and instructions for advanced flying machines, Giorgio studies the sacred knowledge that is said to have come directly from the voices of the gods.

star 7.78
412 votes
The World Before Time

#16 - The World Before Time

Season 15 - Episode 6 - Aired Feb 29, 2020

Shocking new evidence reveals that advanced civilizations might have existed on Earth tens of thousands of years ago. Is it possible that a technologically advanced society thrived on Earth then’ And did they leave behind a record that they lived alongside extraterrestrial beings’

star 7.77
142 votes
The Alien Frequency

#17 - The Alien Frequency

Season 12 - Episode 8 - Aired Jun 16, 2017

The use of mantras and chanting to connect with a higher plane has existed in cultures all over the world dating back thousands of years, but why would people who had no contact with each other all subscribe to this practice? Could there be certain frequencies that connect us with greater--perhaps extraterrestrial--forces? Researchers have found that dozens of megalithic sites stretching across the globe--like the prehistoric Newgrange monument in Ireland, the chiseled labyrinths underneath the island of Malta, and the giant temple complex of Angkor Wat in Cambodia--were all designed to emanate the exact same frequency. The planets in our solar system each give off a distinct sound, and certain places on Earth, like Taos, New Mexico, have been found to produce a hum from an unknown source. Might the best evidence of alien intervention on Earth be found not with our eyes... but with our ears?

star 7.76
452 votes
The Reptilians

#18 - The Reptilians

Season 6 - Episode 15 - Aired Jul 25, 2014

The Reptilian alien is a fixture of science-fiction, from H.P. Lovecraft's tales of Valusians to the Cardassians in Star Trek, to the Visitors of the television series V. But could ancient myths about reptilian creatures provide evidence that they are more than just a pop-culture creation? Legends of serpent beings can be found on every continent. The Bible, the Quran and the ancient texts known as the Nag Hammadi codices all describe reptilian entities interacting with humans. In Central and South America people worship the feathered serpent god called Kulkukan or Quetzalcoatl. In India, the Nagas are half-human half-reptile gods who live underground in a place called Patala. And in China and Japan, many emperors claim to be the descendants of dragons. Could these stories represent real Reptilian beings that people all over the world actually encountered in the ancient past?

star 7.76
172 votes
Alien Messages

#19 - Alien Messages

Season 7 - Episode 7 - Aired Dec 19, 2014

Researchers discuss the possibility that some strange and cryptic communications can help us unlock the mysteries of the universe and contact extraterrestrial beings.

star 7.76
230 votes
Underground Aliens

#20 - Underground Aliens

Season 2 - Episode 4 - Aired Nov 18, 2010

If extraterrestrials influenced human history, can evidence of their existence be found in hidden tunnels and caverns around the world? Could a cave in Ecuador contain metallic books inscribed with secrets of alien technology? Was an ancient underground city in Turkey built with alien help... or as a refuge from an alien attack?

star 7.76
994 votes
Aliens and the Third Reich

#21 - Aliens and the Third Reich

Season 2 - Episode 5 - Aired Nov 25, 2010

If ancient aliens visited Earth in the remote past, could they have given us advanced technology, past down through human history? And could this technology have helped the Third Reich build mysterious weapons and crafts far beyond the limits of 20th century science?

star 7.76
1,172 votes
Alien Resurrections

#22 - Alien Resurrections

Season 7 - Episode 6 - Aired Dec 5, 2014

Throughout history, incredible stories have been told of the dead rising from their graves, mummies journeying into the afterlife, and people on the brink of death mingling with deceased relatives in a celestial netherworld. Are they simply legends--or could some of these stories actually be true? From Jesus and Elijah to mummies and zombies, our culture is filled with accounts of beings who are able to lift the veil between life and death. And even today, scientists are trying to mimic this by suspending death in the operating room for hours at a time. Haitian ...

star 7.75
217 votes
Return to Mars

#23 - Return to Mars

Season 13 - Episode 15 - Aired Jan 7, 2019

An examination of possible encounters humans could have once colonies are established beyond Earth.

star 7.75
163 votes
Secrets of the Mummies

#24 - Secrets of the Mummies

Season 7 - Episode 5 - Aired Nov 28, 2014

For thousands of years, in cultures throughout the world, people have practiced elaborate techniques to preserve the human body after death. The ancient Egyptians believed mummification ensured entrance into the next life. Buddhist monks in Japan practiced a shocking self-mummification process that began before death in the hopes of becoming a "living Buddha." And the Incas consulted the mummified remains of their kings to discuss affairs of state and the future. Ancient Astronaut theorists believe the global practice of mummification is not a coincidence, but proof ...

star 7.75
204 votes
Mysteries of the Sphinx

#25 - Mysteries of the Sphinx

Season 7 - Episode 2 - Aired Nov 7, 2014

The Great Sphinx in Giza is the largest and most studied monolithic sculpture on Earth, yet it remains one of humanities greatest mysteries. This ancient monolith defies explanation, pre-dates our earliest known civilizations and may hide the secrets of our very origins. While mainstream archeology theorizes that the Sphinx was built around 2500 BC, geological evidence suggests it is much older. If this is true, then who--or what--created the Sphinx? Researchers are now proposing the existence of a second, twin Sphinx on the Giza Plateau. If so, has it been ...

star 7.74
294 votes