If you haven't seen any of the videos produced by the Templin Institute, then you are in for a real treat. Templin is a shadowy online organization of deep sci-fi, fantasy, and game geeks who post a prolific number of extremely well-done documentary video essays covering the histories, politics, factions, cultures, and characters behind dozens of sci-fi and fantasy universes.
I have binge-watched dozens of episodes covering aspects of Star Wars, Star Trek, Fallout, Mad Max, Dune, Harry Potter, Warhammer 40,000, Aliens, and many more. They do a really impressive job of putting together these essays using film clips, screen caps, concept and fan art. The writing and narration are also well-done and extremely informative. I learned a lot, even about fictional universes that I already know way too much about.
Recently, the Templin Institute has announced a crowd-contributed sci-fi universe that they are creating themselves. They are going to allow their viewers to submit planets, races, factions, and the like, and the best/most popular ones will be incorporated into the world and future videos. I love this idea. I just hope it doesn't take too much away from their weekly coverage of existing fictional worlds.
You can follow them on their YouTube channel, Twitch, and Facebook. And you can support them on Patreon, if you like what they are doing.