Warning: This post contains light spoilers for an existing comic book story that may be turned into a film.
Variety is reporting that Robert Downey Jr. is close to signing a deal that will continue his involvement in the Marvel universe, up to and including joining the cast of Captain America 3 in order to begin Marvel's "Civil War" storyline.
"The new pact is significant for the Marvel cinematic universe considering the plot will pit Stark against Captain America’s alter-ego Steve Rogers, played by Chris Evans, as they feud over the Superhero Registration Act, which forces anyone with superhuman abilities to reveal their identities to the U.S. government and agree to act as a police force for the authorities," Variety states.
"Stark supports the program, but Rogers does not, saying it threatens civil liberties, causing sides to be taken and Rogers, among others, to go on the run to avoid arrest."
This storyline was significant in the comics in that it made Captain America an outlaw, on the run from other superheroes, and it would continue the discontent and questioning of U.S. policy he showed in the second Captain America film, Winter Soldier.
Here's the interesting bit: The Civil War storyline line is being rebooted in the comics, starting in Summer 2015, which will put this particular story arc back in the minds of comic book fans and pop culture at large. The story begins next year, will likely continue across a number of huge comic lines, and will then hit the theaters in 2016. It's not a bad strategy.
Robert Downey Jr. has also expressed interest in Iron Man 4, especially if it's directed by Mel Gibson. Yes, really.