'Avengers' co-star Hulking mad

Do not let Mark Ruffalo has clarified the behavior fool you. He admits that there is somewhat of an Incredible Hulk temper lurking underneath.

Ruffalo, who comes off as a guy who could give Clark Kent a serious challenge in the gentle department plays brilliant scientist Bruce Banner and his big green alter ego, The Hulk, the superhero adventure "The Avengers" opens Friday in the U.S.

The actor said there was a time when he had anger issues.

"When I was a young actor, if you came to my apartment, you would have seen pictures and photos hung in the most bizarre places where they covered the holes in the wall from the auditions that I did not get or slights that I felt I had just when things were thrown, cups were thrown on the walls, "Ruffalo said. "I am no stranger to that kind of anger and rage.

"But over time I have, as a stone that is used many times, tumbled into the sea, I've kind of got the edges sanded out of me. I do not fight the same battles as I was then, the same demons. "

An Academy Award nominee for 2010 "The Kids Are All Right," the 44-year-old Ruffalo has built an impressive list of credits in independent and studio films, including "You can count on me,"'' Shutter Island, "'" Zodiac "and" Eternal Sunshine of the Spotless Mind. "

He never saw himself as a superhero material, let alone Hulk, in view of the Marvel Comics character was played by Eric Bana as Edward Norton in two big-screen movies in the past decade that failed to please the fans.

The beauty of "The Avengers" is the Hulk does not have to carry the film. Banner is a reluctant recruit to the superhero Dream Team. It is writer-director Joss Whedon keep Banner back, pick up the man's trail after he had found a certain sense of serenity uncertain through which he holds the "other guy" Hulk, from breaking out.

It makes more emotional power to Hulk when he finally unleashed. And through motion-capture technology where Ruffalo's body language and performances are digitally recorded as a base for the Hulk, was crowned with computer animation, see the green giant truer and moves more credible among real people than he did in the earlier film.

The Hulk's face even resembles Ruffalo's, tinted green and tense and swollen in tremendous fury.

"It's scary, I have to say," Ruffalo said when he looked through a photo album with stills of him turned into Hulk. "That's exactly what we would be like. Even my chest hair, gray in my hair. Wow. It's pretty amazing, but it is a little shocking."

With the foundation built Ruffalo in "The Avengers," Whedon said he would love to see him in a solo Hulk movie.

Hollywood may be reluctant to go there again, but Ruffalo said he would be playing, and plenty of fans seem to like the idea.

"I have not heard anyone talk about it from the producing side of the table, but people have been Tweeting it. There has been a growing campaign. I would have to do it, I would think if we could come up with the real story line, "Ruffalo said. "And if they want to see a 50-year-old Hulk. It can be big things. No one may want to see me do it again."