This episode suggests that aliens made contact with primitive humans, and cites as evidence, Indian Sanskrit texts from around 300 BC that are suggested to describe flying machines called Vimanas. Egyptian megaliths that are said to show precision cutting work thought too advanced for the time and Jewish Zohar writings that are said to describe a "manna machine" similar to chlorella algae processing of today

There are 5 incredibly interesting episodes, and after watching this serie, you have more questions than before LOL