2. Episode 2

Most people think that UFOs are just machines in the sky. But legendary researcher Jacques Vallée and writer Whitley Strieber believe that the explanation is much stranger and more terrifying... a terror that Strieber has experienced firsthand.

3. Episode 3

Academics and scientists are finally able to study UFOs and alien encounters without risking their careers. Some subjects remain taboo, though - including materials allegedly left by UFOs, and the frightening stories of "experiencers."

4. Episode 4

A number of mavericks believe that unexplained phenomena like remote viewing and near-death experiences have a strange connection to UFOs - and this connection threatens to change everything we thought we knew about human consciousness.