Return to Mars-S11/E15

As humanity prepares to establish colonies beyond Earth, are we simply realizing mankind's future or returning to its extraterrestrial past? And when humans become the alien visitors on other planets, what—or whom—will we encounter?

The Alien Phenomenon-S11/E14

Erich von Daniken’s Chariots of the Gods? challenged everything we thought we knew about mankind’s history, suggesting that aliens visited Earth in the distant past. Fifty years after the book’s publication, is he about to be proven right?

The Artificial Human-S11/E13

Are intelligent robots a threat to humanity--or the next step in human evolution? As man and machine begin to merge, are we fulfilling a destiny prepared for us by aliens thousands of years ago?

They Came from the Sky-S11/E12

Ancient cultures from around the world believed that meteorites were not merely rocks that fell from the sky, but sacred stones imbued with the power of the Gods. Ancient Astronaut theorists ask: Could these space rocks be pieces of extraterrestrial technology?

Russia Declassified-S11/E11

A secret alliance hidden in plain sight. Joint space missions with undisclosed agendas. Have the United States and Russia been working together from the very beginning of the Space Race--in preparation for the ultimate extraterrestrial encounter?