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Big heroes are big business, and untangling who owns the rights to put your favorite Marvel characters on-screen is a tricky affair.
Here's who owns who in the Marvel universe.
Let's start with Marvel itself.
Marvel entertainment is the company in charge of everything Marvel related, including comics and movies.
Marvel Entertainment was bought by Disney in 2009, but in the years before this Marvel had been selling the rights to make movies about its characters to other studios.
For example, in the mid 90s, 20th Century Fox got the rights to super-powered mutant gang X-Men and has been making successful movies about them ever since.
Fox also still gets to make movies about the Fantastic Four and the fourth wall breaking Deadpool.
Meanwhile Sony has long owned the movie rights to your friendly neighborhood Spider-Man which in a recent alliance decided to allow the character to pop up in Marvel cinematic universe a deal that would see Marvel not taking a cut but Sony's own Spider-Man standalone film.
Some super hero movie deals specify that as long as films about the heroes keep getting made, the rights remain, which is why Marvel is unlikely to get complete ownership of Spider-Man and X-Men back anytime soon.
Some heroes have made a return however, including Punisher, Ghost Rider, Blade, and the man without fear, Daredevil, who's currently starring in his own Netflix series.
Determining who owns who isn't always so clear cut.
It's thought that there are entanglements concerning Universal Pictures and the ocean-dwelling Namor, or a standalone feature about The Incredible Hulk.
While the super speedy Quicksilver has actually appeared in both X-Men and Avengers films, because both 20th Century Fox and Marvel are allowed to use him.
With new deals being forged all the time, however, everything could change.
We might get to see Wolverine fighting Thor after all, although, I'm sure Iron Man would rather Magneto stayed out of his fictional universe.
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