In AVENGERS: AGE OF ULTRON, Mark Ruffalo Will Begin to Explore HULK Being Terrified of BRUCE BANNER

What happens when you put a scientist and a green rage monster in the same room? You definitely wouldn't think the monster is afraid of the scientist. But this is exactly what actor Mark Ruffalo is exploring between the relationship of Bruce Banner and the Hulk.

In Avengers: Age of Ultron, Banner and Hulk return to the big screen and Ruffalo spoke to Entertainment Weekly about how he is developing their respective characters.

"There’s a very cool thing happening: Hulk is as afraid of Banner as Banner is afraid of Hulk.

"[Y]ou haven’t really been able to get inside of Hulk’s head, because the [cinematic] technology wasn’t available to make it nuanced enough to do that, and now it is. So now I think there’s a way to do it. Both of these guys are obviously the same guy, and they have got to come to peace somehow with each other. And I think that this confrontation is building along the lines of this film. He’s terrified of [Banner]. 
"What makes Hulk afraid? It’s himself. It’s a version of himself that’s weak. It’s a version of himself that’s vulnerable. It’s a child inside of him. It’s very interesting, and I’m stumbling on this. And I don’t know if this is where the next version will go. But if it is in the cards that we’re doing the next version of this, I see some fertile ground there."

By not having his own solo Hulk movie, like most of his Avengers comrades in Phase 2, Ruffalo has been able to think a lot about where he wants to take Banner and Hulk in Avengers: Age of Ultron and beyond to Phase 3.

"I’ve been mulling this over now for a few years. And I haven’t pushed for it because I honestly didn’t know what hadn’t been done. And this time, there’s an interesting confrontation on the horizon between these two."

"On the horizon" is a little teaser clue. Could this confrontation between Banner and Hulk boil to something so terrible the Hulk becomes a threat to his teammates and Earth? Fans will have to wait for that answer. Until then, Hulk is set to smash next summer.

Avengers: Age of Ultron is currently filming in the U.K. and is set to release on May 1, 2015