Recently, a leaked video clip of the upcoming film, 'Avengers: Age of Ultron', revealed just how the Marvel Civil War sparks from an argument between Steve Rogers (Chris Evans) and Tony Stark (Robert Downey Jr.).

While the two are set to butt heads in another upcoming film, 'Captain America: Civil War', it seems that fans will catch a glimpse of that in 'Avengers: Age of Ultron' which premieres May 1, 2015.

In the film, the team is forced to retreat to Hawkeye's rural farm where the two are talking about a encounter with Wanda Maximoff/Scarlet Witch (Elizabeth Olsen). Apparently, that fight did not end well for the Avengers, as an enlargement between the two superheros ensues.

"Earth's Mightiest Heroes...She pulled us apart like cotton candy," The Cap said to Iron Man after pointing out that he was unaware of what the Scarlet Witch did to him.

The Cap claims that Tony Stark was reportedly "brainwashed" by Maximoff, and made him "do something stupid."

The video also revealed that Thor went away to find "answers" to an undisclosed issue, and Tony Stark apparently did something "stupid" causing Captain America to rip a log in two using his bare hands out of anger.

Meanwhile, Stark replied to Rogers saying that he "walked away" from the fight, which angered Rogers, saying that "every time someone tries to win a war before it starts, innocent people die, every time."

Additional spoilers come from 'Avengers: Age of Ultron' director Joss Whedon who reveals that the film will show the growing rift between Captain America and Iron Man, which will culminate in the upcoming 2016 film 'Captain America: Civil War', where Iron Man and Captain America clash.

The Cap doesn't agree to with the Superhero Registration act requiring superheroes to disclose their identities, while Iron Man believes otherwise. This partition will end up in chaos as every superhero ends up choosing a side.

"This is a very global film. We wanted the world perspective on the Avengers. What they are doing and who they are. They're being the Avengers and that's a global things. It doesn't make everybody love them, so we wanted to see both sides of that," Joss said.