• Actor Mark Ruffalo attends a news conference to promote the film "Foxcatcher" at the Toronto International Film Festival (TIFF) in Toronto, September 8, 2014.

Actor Mark Ruffalo attends a news conference to promote the film "Foxcatcher" at the Toronto International Film Festival (TIFF) in Toronto, September 8, 2014. (Photo : REUTERS)

The Hulk/Bruce Banner is set to return in "Avengers: Age of Ultron." Mark Ruffalo, who portrays the character of The Hulk, shared details about what fans can expect from his character in the upcoming movie. The actor stated that the character "is kind of wild card."

Mark Ruffalo talked to Empire Online and when asked about what he can say about The Hulk in "Avengers: Age of Ultron," he said that "he's the loose cannon of the group."

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Ruffalo said The Hulk is "more like an atom bomb. You could guess where he's going to go but he could go either way."

The actor added that a war is on between the two egos that reside inside Banner. Ruffalo was also asked about Bruce Banner's status when "Avengers: Age of Ultron" begins. 

Ruffalo also said that Banner has "matured a little bit since the last one." Banner is now becoming much aware of the thing inside of him. Also, he has now become a solid part of the team.

"Avengers: Age of Ultron" is focused more on each character as it not delving into S.H.I.E.L.D. anymore. According to Ruffalo, in the new movie, every character is doing their thing. He teased that The Hulk has a lot of stuff going on in the new "Avengers" movie.

"Avengers: Age of Ultron" will see Mark Ruffalo as Bruce Banner/The Hulk, Scarlett Johansson as Natasha Romanoff/Black Widow, James Spader as Ultron (voice), Chris Evans as Steve Rogers/Captain America and Robert Downey Jr. as Tony Stark/Iron Man on May 1.