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.
https://youtu.be/At_NxSmdR4I
https://youtu.be/l-SrJuuWCIQ
https://youtu.be/TFDvtXDFJes
https://youtu.be/58aaAiIhL0I
https://youtu.be/GDbPvaicYoY
https://youtu.be/bEQame19KVY
https://youtu.be/TiorUtiAJoU
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.