Ancient Aliens

Giorgio A Tsoukalos and David Childress explore the mysterious chain of man-made islets in Micronesia's Nan Madol. Could local legends be true? (S12, ep 23)

In 1947, the US military collected debris of what they claimed was a crashed weather balloon outside Roswell, New Mexico. But was there more to it? (S12, ep 25)

Chile has the highest number of UFO sightings of anywhere on Earth. Now, incredible footage of a strange craft has people asking again about the reasons why. (S12, ep 26)

From Egypt to Easter Island, towering figures built by ancient man stand watch over Earth. But do they depict visitors from another world? (S12, ep 27)

New evidence reveals advanced civilisations might have existed on Earth thousands of years ago - is it possible that they lived with extraterrestrials? (S12, ep 28)

In numerous ancient cultures, stories were told of ancestors from the Pleiades star cluster - could new scientific findings reveal the truth? (S12, ep 29)

In the Mojave Desert, there is a structure built to bestow everlasting life, and according to the architect, its blueprint is from another world. (S12, ep 30)

Accounts of creatures that can shapeshift from one form to another can be found throughout history. But are they real and do they have otherworldly origins? (S12, ep 31)

The Mystery of Skinwalker: Nestled in Utah lies a ranch some believe to be a hotbed of strange phenomena. Is it all connected to an alien entity known as the Skinwalker? (S12, ep 21)

UFO witnesses have reported a variety of objects in Earth's skies for centuries - could they offer clues about more intelligent life in our galaxy? (S12, ep 32)

The White House has consistently denied any knowledge of aliens, but is it in fact possible that extraterrestrials have been influencing presidents? (S12, ep 33)