Despite the recent Fox deal, there are still several important characters from Marvel Comics that the Disney-owned Marvel Studios has limited or no rights to.
Years before the Marvel Cinematic Universe began with 2008’s Iron Man, Marvel had sold off the rights to many of its iconic characters, such as the X-Men and the Fantastic Four. In December 2017, Disney bought the rights to the majority of Fox’s intellectual properties, including those franchises. Yet, may not realize that some characters remain at least partly outside of Disney’s control.
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• Hulk: Bruce Banner and his cast are owned by Universal Studios; they and Disney struck a deal to make the MCU’s Incredible Hulk. Disney can now use the character in any OTHER films they want, but Universal has the distribution rights to any Hulk solo films. Hence why he now shows up in Avengers and Thor movies.
• She-Hulk: The Hulk’s cousin, who has a similar condition to his but is quirky rather than uncontrollably angry. She is considered a Hulk character and thus is also owned by Universal.
• Spider-Man: Owned by Sony. The web-slinger exists in the MCU due to a similar deal as the Hulk has. Disney can make three solo films and two Avengers flicks with him; beyond that, new negotiations will have to take place. Meanwhile, Sony is making their own spin-off films about characters like Venom, Black Cat and Silver Sable.
• Namor the Sub-Mariner: One of Marvel’s oldest character, the King of Atlantis, like Hulk, has his distribution rights owned by Universal (apparently; Joe Quesada claims otherwise). Marvel has reportedly been trying to give him a film, however.