I’ve sometimes wondered what the largest and most complicated fictional universe is. Star Wars would be an obvious contender, though the Marvel and DC comics universes have been around longer and have been producing material on a weekly basis, so one of them probably takes the prize. The Warhammer 40,000 universe is also surprisingly detailed, maybe not as detailed as Star Wars, but new stories set in two different time periods are coming out on a regular basis. Star Trek is a pretty big universe too, but new material is not being created very quickly these days. Doctor Who is also pretty big, but it does tend towards standalone stories that don’t have lots of connections to other stories.