When we try to rank movie franchises, we must remember that such a thing did not really exist until recently. Serials from the early 20th century weren't expected to be blockbusters, and after those died out, few movies had sequels before the age of home video. If you go by box office take, you have to keep in mind that the older a movie is, the less expensive the tickets were. Also, there's the problem of defining a franchise. The Spider-Man series is not considered part of the Marvel Cinematic Universe because those movies are from a different studio. The Marvel Cinematic Universe includes both the Avengers movies and Guardians of the Galaxy, even though one takes place on earth and the other in space. Yet X-Men is a different franchise, even though they are also about comic book characters produced by Marvel. Confused yet? Maybe it will be clearer when you see how the top ten movie franchises ranked, in a list at Mental Floss. Or maybe not. The list tells us that Batman v Superman: Dawn of Justice is officially a part of the Batman franchise, but not tell us whether Suicide Squad or Justice League are included.