8. The Truth Behind: UFOs
Rating: 5.2
This documentary ranks 9th in our list of best alien documentaries to watch on Netflix in 2017, and it comes directly from National Geographic. You can expect the high degree of polish that we all know and love from National Geographic documentaries. However, like every other documentary mentioned in this list, you have to take the information found in it with a grain of salt, as it is very difficult to distinguish fact from fiction when it comes to UFOs and extraterrestrial encounters.
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