The massive press tour for Marvel's Avengers: Age of Ultron is winding down, with the release date just one week away. Two of the Avengers, Chris Evans' Captain America and Robert Downey Jr.'s Tony Stark, will be back, though with a much different dynamic, in the first Phase Three adventure Captain America: Civil War. While promoting Avengers: Age of Ultron in a joint interview with The Washington Post, both actors shed some new light on this sequel, which finds Steve and Tony on opposite sides of the Superhero Registration Act, where every superhero must register themselves with the government and join a global police force. Chris Evans teased that Tony has been changed after the events of Avengers: Age of Ultron, which leads in to Captain America: Civil War.

"Morality hits Tony, humanity hits Tony. All of a sudden he feels responsible. Neither one of them are blindly convicted. It's blurry and that's what makes it great. No one's right, no one's wrong."

Robert Downey Jr. says that both Steve and Tony staunchly believe that their side is right, which will make it harder to find a common ground.

"It's going to make it even harder for them to come to an agreement, which I'm really excited about."

Chris Evans added that Steve's relationship with Tony is like a marriage, with each side having a different approach.

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"It's like a marriage. We love each other but it's explosive. You're working toward the same goal but you have very different approaches to it."

Robert Downey Jr. added that he's looking forward to a time when Tony and Steve have more to do, aside from fight with each other. With Avengers: Infinity War coming up in a few years, there's still plenty of time for these characters to put aside their differences.

"I'm really stoked to see when we have more stuff to actually do together besides like act like we're about to have a fight one day."

Captain America: Civil War is the first of Marvel's nine-movie Phase Three slate, in which the studio will start putting out three movies a year, instead of two. When asked if he thinks fans might be suffering from "superhero exhaustion, Chris Evans had this to say.

"Some people say there's going to be superhero exhaustion. But these movies aren't just superhero movies. The superhero involvement is what's going to bring the audiences because of the familiar properties but then you get into the movie and it's not just him and his suit, it's not just me and my shield. It's people having real life discussions and real life conflicts as characters, that's what people are going to relate to."

Robert Downey Jr. also appeared on Late Show with David Letterman last night, where he spoke more about Captain America: Civil War.

"Well, it's called Civil War, and there was a strain of comics where Captain America and Iron Man, they went on different sides, and they fought each other. I wouldn't call either of them evil, [but they want control.]"

The actor confirmed that production will start in a few weeks, and he also essentially confirmed what many fans already knew, that the new Spider-Man will be present in Captain America: Civil War.

"He may well be... Yeah, I hear that they're looking to cast a new Spider-Man."

What do you think about all of these new details? With production starting soon in Atlanta, hopefully Marvel will share some new details regarding Captain America: Civil War as production gets under way, along with news of who will play the new Spider-Man. While we wait for that information to come in, take a look at Robert Downey Jr.'s appearance on Late Show with David Letterman last night.