Iron Man Captain America Avengers Civil War
Iron Man and Captain America share the screen for the first time in Avengers Assemble.Marvel Studios

Avengers: Age of Ultron will set the stage for Marvel's next big film - Captain America: Civil War which will feature Steve Rogers and Tony Stark on opposing sides. And it looks like the dissolution of S.H.I.E.L.D. - that happened in Captain America 2 - is the key factor responsible for the Civil War.

According to Digital Spy, Avengers 2 producer Jeremy Latcham revealed earlier the core reason behind the two primary superheroes turning against each other:

"Much of the Avengers' problem boils down to their lack of a clear leader post-Winter Soldier. SHIELD has fallen apart, so this movie becomes Tony Stark and Steve Rogers trying to put the Avengers together without a parental unit like Nick Fury hovering over them," explained Latcham. "What you realize is that these are guys who work best with rules, and probably do need some adult supervision."

"And as anybody who watched the first film can guess, Tony and Cap aren't an ideal leadership pairing," he added.

"Tony has been paying for everything, designing stuff, building new toys, he's the benefactor of the whole thing. But Steve Rogers is very much in charge of operations and missions, he's the moral compass."

"But how long can Tony Stark have someone else be in charge?" In other words, groundwork is being distinctly laid for the Stark vs Rogers core of Civil War."

Avengers: Age of Ultron opens in theatres on 1 May, 2015 while Captain America: Civil War is slated for release on 6 May, 2016.