Since 2014, the Russo Brothers have been busy helming adaptations of classic Marvel superheroes starting with Captain America: The Winter Soldier. As the directors work on post-production on Avengers: Endgame, they shared their thoughts on adapting DC Comics' flagship character, Superman, for the big screen.

"The more powerful a character is, the more difficult to deal with that character on a narrative level," explained Anthony Russo in an interview with Business Insider. "We always look for vulnerabilities in characters because that's where characters become interesting. They're superficially interesting in their strength, but they get much more depth when you find where they don't have that kind of strength. In general, the more powerful a character is, the more tricky that is."

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Endgame is the fourth Marvel Cinematic Universe film the Russos have directed for Marvel Studios, though as fantastical as the stakes and story can get, they have consistently kept the characters themselves relatively grounded. As for the Man of Steel, the character's incredible power levels make him more difficult for the filmmakers to connect to.

"[Superman's] a very difficult character," admitted Joe Russo. "You have to find an emotional flaw or weakness in the character in order to make them vulnerable."

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Avengers: Endgame will arrive on April 26, 2019. Directed by Joe and Anthony Russo, the film stars Robert Downey Jr., Josh Brolin, Mark Ruffalo, Tom Hiddleston, Chris Evans, Chris Hemsworth, Jeremy Renner, Chris Pratt, Elizabeth Olsen, Chadwick Boseman, Sebastian Stan, Benedict Cumberbatch, Paul Bettany, Samuel L. Jackson, Cobie Smulders, Benedict Wong, Zoe Saldana, Karen Gillan, Vin Diesel, Dave Bautista, Pom Klementieff, Scarlett Johansson, Tom Holland, and Anthony Mackie.