1. Invisible Enemies

Josh Gates examines an alleged alien abduction, the bizarre death of an American hero's son, and invisible attacks made upon CIA operatives in Cuba.

2. Monsters Unmasked

New information reveals Jack the Ripper's identity. DNA suggests the existence of a Yeti. Max Headroom hijacks a live broadcast, shocking the world.

3. Tragic Endings

Josh Gates investigates the curse of Tut's tomb, the strange demise of students hiking in Siberia, and the disappearance of a man in the desert.

4. Lost Civilizations

Josh Gates studies the vanishing of the 16th-century inhabitants of Roanoke, the purported discovery of the city of Sodom, and Stonehenge's secrets.

5. Code Breakers

Clues from the Zodiac Killer are finally deciphered. A million-dollar treasure is revealed. An ancient manuscript may explain the origins of life.

6. Mysterious Relics

A new study shows the Shroud of Turin could be real. Old ghost photos are analyzed with new tools. The creator of the Georgia Guidestones is revealed.