Joe and Anthony Russo have helmed some major films for Marvel Studios, including Captain America: The Winter Soldier, Captain America: Civil War and Avengers: Infinity War. They're not currently slated for any films after Avengers: Endgame, but they do know which event they'd return to direct.
In an interview with MTV, the co-directors were asked which Marvel comic event would bring them back to Marvel Studios. "I keep saying Secret Wars cause that was one of the first books that I really fell in love with as a kid... this notion of, event storytelling," Joe Russo said.
Russo also explained that Secret Wars is part of the reason for them doing event films for Marvel, saying, "And I think that's part of the reason that we gravitate so strongly towards these event films and these ensemble films is that the notion that you can contain so many different characters, and so many different points of view, and galvanize them around a story point is really compelling to us."
In a previous interview, the directors said that Secret Wars was the comic book story that would bring them back to Marvel, but it wasn't clear at that time if they meant 1984 classic by Jim Shooter, Bob Layton and Mike Zeck, or the 2015 storyline of the same name by Jonathan Hickman and Esad Ribic. However, given that Joe mentions reading the story as a child, it's clear that he is talking about the original series.
Secret Wars was originally published between May 1984 and April 1985. The story was a sprawling crossover event that featured the likes of the Avengers, Spider-Man, the Fantastic Four and the X-Men. The event saw the Marvel Universe's biggest characters fighting on Battleworld after getting abducted by the Beyonder. The series was particularly famous for introducing Spider-Man's black suit, after the superhero first came into contact with the Klyntar symbiote.
Directed by Anthony and Joe Russo, Avengers: Endgame stars Robert Downey Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, Jeremy Renner, Don Cheadle, Paul Rudd, Brie Larson, Karen Gillan, Danai Gurira, Benedict Wong, Jon Favreau and Bradley Cooper, with Gwyneth Paltrow and Josh Brolin. The film arrives April 26.