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Iron Man to join 'Captain America 3' film?

Robert Downey Jr. is reportedly in contract discussions to play Tony Stark for the next installment of Captain America, which may launch Marvel's civil-war storyline.

Iron Man and Captain America won't see eye to eye in the Super-human Civil War. Marvel

Tony Stark is never one to run away from a fight, and this next one may end up being with a fellow Avenger. If reports are true, Robert Downey Jr. could be reprising his role as Stark, aka Iron Man, in the upcoming film "Captain America 3," which will bring Marvel's civil-war storyline to the big screen.

"The actor is in final negotiations to play the billionaire in the yet-to-be-titled third installment, that is slated to begin production in the spring for a May 6, 2016, release, according to sources close to the discussions," Variety reports. "Downey suits up as the superhero in next summer's 'The Avengers: Age of Ultron' as part of a previous deal that also calls for him to reprise the role in 'The Avengers 3.'"

Downey Jr. has already starred as Tony Stark/Iron Man in three "Iron Man" films, plus "The Avengers" and next summer's "The Avengers: Age of Ultron."

The civil-war storyline has Stark and Steve Rogers, aka Captain America (played by Chris Evans), butting heads over the Super-human Registration Act -- a legislative bill requiring all people with superpowers to reveal themselves to the government instead of hiding behind their true identities. They would also be required to act as a form of police, under the jurisdiction of the U.S. government. While Stark supports the law, Rogers says it threatens civil rights.

This week, Marvel revealed plans to release a new comic book miniseries that will introduce fans to the civil war in 2015, before "Captain America 3" is released. Marvel also tweeted "#CivilWar #1 -- Summer 2015" with the cover image.

"Captain America: The Winter Soldier" directors Joe and Anthony Russo are slated to return for "Captain America 3." The script will be penned by Stephen McFeely and Christopher Markus.

Fans may want to keep a close watch on Marvel's social-media accounts for more teasers and news as it's released.