These are the domestic box office returns for franchises as defined by the-numbers.com, which counts smaller sub-franchises within connected universes (take note, superhero fans) for BOTH the sub-franchise and the connected universe.
Franchises include both canonical and non-canon entries.
Number of movies has been adjusted from the source to include only theatrically released films.
Grosses are not inflation-adjusted and may include re-releases, special editions, etc.
Tried to clarify this in the comments - the source double-counts entries that span multiple franchises. The four Avengers movies are a sub-component of the MCU, just as the three Iron Man movies are. Unfortunately, the source also counts a ton of not-yet-released movies, special format re-releases, direct-to-video movies, etc. toward the total number of movies. And I just realized that I forgot to change the # of movies for Avengers - it should be 4, not 6.
So Avengers is included but not Iron Man, Thor, Captain America? You telling me each of those adds up to less than 1,366 B? And what about Mission Impossible? Indiana Jones?
Any of those could have been included, but their domestic box office return totals are outside of the top 20. Mission Impossible is #22, Thor #24, Iron Man #25, and Indiana Jones #27.
I would add that you accept just the word Marvel for the MCU but you don't accept just DC for the DC extended universe. please be consistent. I would also agree with the first comment that Avengers is just as much a part of the MCU as iron man, or Thor or guardians of the galaxy, etc. etc. should be 33 movies. good quiz otherwise. even if I take those two my score still was only 16/20 so good challenge.