If there is one UFO documentary you owe it to yourself to bookmark, it's this one. It's intelligently put together, raises the most pertinent issues we need to have a thoughtful opinion on, and introduces the critical points most in need of proximity to the conceited and corrosive view (we've been brainwashed to believe) that we are the only sentient life in the Universe. The subject is vast and still largely controlled but this is as good a start as I would have wished when commencing my research. If you have any raging questions or criticisms of it please ask in the comments. There's nothing new in it for me except it's a better explanation that I'd be capable of delivering to someone new to the topic.