'Avengers: Age of Ultron' seems to have so much in store for fans with all their announced appearances of our favorite Marvel heroes and villains, but many are still curious to what we'll see from some of the original cast.

Mark Ruffalo, actor who portray Bruce Banner/The Hulk, sat down with Empire Magazine to discuss some things we can expect from his character in this movie and how he's developed.

Bruce Banner is one of the more complex characters of the cast and the franchise hasn't yet had the opportunity to dive into his origin or being. He's also one of the most fun to watch on screen when he does turn into the Hulk.

His role is definitely integral, and he speaks on why that is so:

"I think he's definitely matured a little bit since the last one. He's become more acclimated to this thing and to being part of the team. I think he feels more a part of them all. But in this particular take on it, it's a much more character-driven version of The Avengers than the first one. It gets a little deeper into each character. S.H.I.E.L.D. is not happening anymore, so there's not that much time spent with the S.H.I.E.L.D. stuff. I feel that every character has their own cool little thing happening. I had great stuff in the last one but there's even more stuff in this one. It's nice, because I know this character now after playing him twice..."

When asked about the internal struggle between the Hulk and Banner he answers:

"Hulk is the kind of wild card. He's the loose cannon of the group. He's more like an atom bomb. You could guess where he's going to go but he could go either way. I think that there is, obviously, the day when everyone expects it to go wrong and that day comes. And they're ready. And Bruce designed the contingency plan. As much as you feel Bruce has some mastery over it - certainly, with 'I'm always angry' and he can turn into it at will - I still feel that there's some part of him that doesn't completely trust it and doesn't completely trust himself.

"There's a battle going on between these two opposing egos that live inside him. He's definitely worried that the day is going to come when the Hulk gets the best of him, and maybe won't release him, maybe won't give him back. The Hulk knows this too. There's a moment in here where he, begrudgingly, decides to go back to Banner. Who knows where these things will go, but as Bruce is able to impress his will on the Hulk, going into The Hulk and being inside the Hulk when he's raging, The Hulk's will is also growing and able to impress upon Bruce. That makes for some wild things. We're laying the groundwork for that here. It'll be interesting to see if that ends up being what would be the next Hulk movie."

There is currently no word on a standalone Hulk film.