After helming Avengers: Infinity War and its upcoming untitled sequel, the Russo Brothers' acclaimed tenure working in the MCU may be coming to an end. However, there is one classic Marvel storyline straight out of the comic books that may entice the directors back for one more film.While at Q&A following a special screening of Infinity War in Los Angeles, the brothers were asked if they would reconsider their self-imposed retirement from making superhero movies now that Marvel Studios was regaining the rights to the Fantastic Four and X-Men to which Joe Russo immediately replied "Not until they make Secret Wars."RELATED: Avengers 4 Directors Refuse to Answer Questions About Trailer

Referring to the classic 1984 comic book story written by Jim Starlin and illustrated by Mike Zeck and Bob Layton, the crossover event had the Avengers, Fantastic Four, X-Men, Spider-Man, and Hulk whisked away to an alien world to fight a collection of their greatest enemies for an omnipotent being known as the Beyonder.

This echoes previous statements from the Captain America: Civil War co-director made in April while promoting Infinity War.

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The untitled sequel to Avengers: Infinity War will release on May 3, 2019. Directed by Joe and Anthony Russo, it stars Robert Downey Jr., Josh Brolin, Mark Ruffalo, Tom Hiddleston, Chris Evans, Chris Hemsworth, Jeremy Renner, Chris Pratt, Elizabeth Olsen, 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.