Fans hoping to see the X-Men or Fantastic Four crossover on the big screen with the Marvel Studios heroes will have to just keep waiting. Ever since the Marvel Cinematic Universe launched back in 2008, film rights have kept the FF and the mutants from joining in on the shared universe fun. Fox owns their rights while Marvel Studios owns everything else -- and that's how it'll be staying.

While speaking with Variety, Marvel Studios president Kevin Feige responded to a question about sharing the heroes' rights with Fox. "It’s an impossibility at this juncture," said Feige of the prospect of working with Fox. "We certainly have enough films to keep us busy for a number of lifetimes."

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Fans might have gotten their hopes up when Marvel Studios reached a deal with Sony Pictures to share Spider-Man's film rights, bringing him into the Marvel fold after starring in a number of solo pictures. The wall-crawler, played by Tom Holland, made his Marvel debut in this year's "Captain America: Civil War" and will return in 2017's "Spider-Man: Homecoming."

"It takes place inside the cinematic universe that we have built across 14 films," said Feige of the new Spidey film. "In the previous films, Spider-Man was the only superhero who existed in that world. In the comic books, Spider-Man always existed in a world where the Avengers existed, and Iron Man existed, and the Hulk would run through the streets, and Captain America had been thawed out of the ice. In the film, he’s a young kid who has to be home at curfew so his Aunt May doesn’t get worried, and go to school, and do his homework. That’s in contrast to Tony Stark’s life or Stephen Strange’s."

And speaking of those films keeping Marvel busy for "a number of lifetimes," there's also 2019's "Captain Marvel" coming up. Feige spoke about casting the role with Brie Larson. "With Captain Marvel, who has powers that approach a level that we haven’t seen before in our films, you need to counter-balance that by finding somebody who is also very human and very relatable and can get into a groove with the audience, where they’re willing to see her fly through the sun and punch a moon away from a spacecraft," said Feige. "At the same time, we need her to land and have relatable flaws. Brie is a person you’re going to want to go on this journey with, just like Benedict [Cumberbatch] or Robert [Downey Jr.] or Chris Pratt."

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Feige also added that it is a top priority to find a female director for "Captain Marvel." "Having a female director at the helm to tell the story of a woman who is also our most powerful hero by far is very important to us," said Feige."

The next installment in the Marvel Cinematic Universe, "Guardians of the Galaxy Vol. 2," will arrive in theaters on May 5, 2017. "Spider-Man: Homecoming" will swing into cinemas on July 7, 2017." "Captain Marvel" arrives on March 8, 2019.

On the Fox front, the next X-Men film "Logan" arrives on March 3, 2017.