Experts open previously off-limits files in a bid to answer some of the most mysterious questions surrounding UFOs and extra-terrestrial life. (S1, ep 7)

Experts open previously off-limits files in a bid to answer some of the most mysterious questions surrounding UFOs and extra-terrestrial life. (S1, ep 6)

A look at the possibility that life began on Mars and travelled to Earth. Plus, if aliens exist, what plans do they have in store for us? Experts investigate. (S1, ep 5)

Previously sealed documents hint at compelling new theories about extraterrestrials. Could aliens be living among us? And could former US Presidents know something we don't? (S1, ep 4)

Experts investigate why so many UFO sightings take place in Los Angeles, determining that the answer may lie underwater. (S1, ep 3)

Recently-declassified FBI files cast new light on the existence of aliens, as well as question whether the Vatican could be hiding proof of extra-terrestrial life. (S1, ep 2)

Series investigating compelling UFO and alien cases by opening previously off-limits secret files. Does the mysterious Blue Planet Project hold the answers? (S1, ep 1)

First Contact: As humanity continues to search for alien life, experts give their analysis on how close we are to First Contact. (S4, ep 20)

Alien Achilles Heel. Many believe aliens are already here on Earth. Could they be plotting an attack? And if so, can humans survive their weapons' terrifying capabilities? (S2, ep 20)

Artificial Alien Intelligence: Is biological life merely a stepping stone for a universe dominated by alien artificial intelligence? (S4, ep 19)