this is a link to a documentary made on UFOs , it's divided into 7 episodes , this is the one show that will totally change your prospective on UFOs.
The National Geographic rarely delves into the more controversial topics but once it does , it produces outstanding out of the ordinary material , this documentary is no exception.

I was hooked from episode 1 , the depth , the inquiry , the production , the research , the evidence - all absolutely outstanding , I rate this as the #1 documentary ever to be made by mankind on this subject matter.

National Geographic : UFOS The Untold Stories.