List of documentaries about aliens ranked by the community. This list includes popular and recognizable titles, along with a lot of independent films about aliens and UFO sightings. What are the best documentaries about aliens? Vote on the films below to find out or add your favorite documentary about aliens if it isn’t already on the list. As you vote, the order of the list will be changed to see which documentary about aliens comes out on top. If you don’t see your favorite on the list, add it along with the titles below so that others may vote on it, as well. This list currently includes titles such as Out of the Blue, with producers traveling around the world to investigate some of the most famous UFO events on record.