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In this series, investigators looks for evidence to back up theories that aliens visited Earth long ago and helped humans to build advanced civilizations. Also addressed is the possibility that aliens are still around, but their presence is being kept secret by a shadowy global conspiracy.

Ancient Aliens is a Documentary & Biography series that is currently running and has 15 seasons (193 episodes). The series first aired on March 8, 2009. It has moderate reviews from critics and viewers, who have given it an IMDb score of 7.3.

Ancient Aliens is available for streaming on the History website, both individual episodes and full seasons. You can also watch Ancient Aliens on demand at Philo, IMDb TV Amazon Prime, Netflix, Amazon, Hulu, History, Vudu, Microsoft Movies & TV, Sling, Google Play, Hoopla, iTunes, Philo, IMDb TV online.

Friday 9:00 PM et/pt on History
15 Seasons, 193 Episodes
March 8, 2009
Documentary & Biography
Cast: Robert Clotworthy, Giorgio A. Tsoukalos, David Childress, William Henry
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Ancient Aliens Full Episode Guide

  • The White House has consistently denied having any knowledge of alien craft visiting Earth, but presidential encounters with UFOs and other strange phenomena can be found going all the way back to George Washington. It is discussed whether it is possible that extraterrestrials have been monitoring and even influencing America's presidents.

  • Nestled within a remote valley in Utah is a ranch that some believe is a hotbed of strange, inexplicable phenomena including terrifying creatures, paranormal apparitions, and lights in the sky. It is discussed whether the bizarre activity could have a connection to an alien entity known as the Skinwalker.

  • Could ancient and modern-day alien abduction stories prove that alien shapeshifters are real?

  • Shocking new evidence reveals that advanced civilizations might have existed on Earth tens of thousands of years ago.

  • The allegations that the U.S. government is plotting with space aliens.

  • The Chilean government questions whether new footage from a Navy helicopter indicates a connection to geoglyphs in the Atacama Desert.

  • In 1947 the U.S. military collected the debris of what they claimed was a crashed weather balloon outside of Roswell, New Mexico. But new evidence may prove the conspiracy theorists right--that the wreckage actually belonged to an extraterrestrial spacecraft.

  • A look into the man-made islets in Nan Madol and the mysteries they hold.

  • Over the past 20 years, thousands of potentially habitable exoplanets have been discovered outside our solar system. Could some of them be home to intelligent extraterrestrial life? Perhaps even alien beings that have visited Earth?

  • Are governments around the world preparing mankind for the most startling event in human history

  • In 2019, millions responded to an internet post advocating to storm the gates of the world’s most top-secret military installation

  • Tattoos, piercings, and body modification account for a nearly one-billion-dollar industry. But are these practices being adopted by mainstream society as a bold form of self-expression or could it be motivated by a profound link to our ancestors? By studying these human hieroglyphs, might we uncover extraordinary secrets?

  • Divine substances were consumed by the gods but sometimes gifted to humans to impart great power or wisdom; could the food of the gods be sustenance for alien visitors and does it lend insight into humanity's future.

  • A shocking DNA study released in 2018 reveals that the original builders of Stonehenge mysteriously vanished. But where did they go? Could Stonehenge's mysterious "Bluestone circle" have activated a portal that transported the ancient culture back to their former home amongst the stars?

  • A mountain in Northern Italy witnesses strange sightings in the sky.

  • The UFOs are reported to be present at nuclear facilities all over the world.

  • Examining some ancient world structures and the possibility they were designed as messages for extraterrestrial visitors.

  • The native Hawaiians trace their ancestry to beings from the Pleiades star system called the Akua. Could these islands have once been inhabited by extraterrestrials?

  • Could paranormal activity be explained by beings entering our world from other dimensions? According to some Ancient Astronaut theorists, entities that have been described as ghosts, angels, and extraterrestrials are actually visitors from unseen realms

  • It is discussed whether extraterrestrials are altering human DNA and repopulating the Earth with alien/human hybrids. A trail of evidence is followed from ancient cultures to modern-day animal mutilations and alien abductions.

  • In 2016, scientists made the astonishing discovery that 30 percent of all protein adaptations since humans’ divergence with chimpanzees have been driven by viruses. Could ancient aliens have shaped human evolution by introducing viral epidemics on Earth? And if so, for what purpose? Are they making us more like them?

  • Serpent gods are found in the religious traditions of Mesopotamia, Central and South America, India, China and Japan.

  • Investigating if ancient Druids travel to New England and New York's Hudson Valley centuries ago, bringing with them the beliefs and technologies of their alien mentors, the Shining Ones of Irish myth; and if they left behind vital clues in the form of mysterious stone structures still visible on the landscape.

  • Looking into the secrets of the Mayans and how they are connected to extraterrestrial beings.

  • Did aliens from a tiny star visit humans in the past, imparting the knowledge of civilization? And did they leave behind a vital clue in the form of a word that's embedded in languages all over the globe?

  • According to physicist Bob Lazar, "Element 115" is the fuel source for an alien spacecraft he was hired to reverse-engineer by the U.S. government--and if we can harness its awesome power, it will change our world forever.

  • Satellite images have revealed a giant face that appears to be carved into the Earth in Alberta, Canada, which has now become known far and wide as "The Badlands Guardian." Exploring the idea that it could be part of a cosmic communication system, one that when deciphered will link this planet to its extraterrestrial origins.

  • Exploring Antarctica and the truth behind the rumors of aliens inhabiting the continent.