I found the information offered in this documentary series tremendously insightful and refreshing given that it does not attempt to conform to the accepted boundaries of mainstream beliefs. The information is not portrayed as hard fact as other reviewers have suggested. The theories put forth in support of alien presence on earth are extremely compelling and essentially left up to the viewer to decide.
Whilst I would not recommend this series for those who are either prejudiced or easily offended by views that conflict with religious beliefs, I think it is important for all others to be aware of certain events and facts contained within as many were not comprehensively reported on by mainstream media.
I feel fortunate to have stumbled upon this documentary series and I thank the producers.