The hit NBC series Heroes chronicles ordinary people who develop superhuman abilities returns for its fourth Monday tonight. During this upcoming season we have to ask if good will be able to outlast evil and will the future be able to be saved? Only time will tell.

Until then, here's what Hayden Panettiere who portrays Claire Bennet, a teenager who has the power of rapid cellular regeneration that allows her to heal quickly and Masi Oka who portrays Hiro Nakamura, a man who has the ability of space-time manipulation had to say about Heroes.

Eric Stromsvold: As we're going into the fourth year of the show, do you feel like you have a tight grip on your character or are you still learning things as you come along?

Hayden Panettiere: It's a little tough because even though we are playing the same characters, you really do have the whole writing staff taking us in whichever direction they want to. And on this kind of show there's infinite amount of possibilities of where you could go, whether you stay good, whether you turn bad [and] who you're working with.

So it's always a surprise. I think you can only -- I mean we know our characters so well now that we can see what they -- or figure out what they would do in these situations and go from there. But really you never know what you're going to be playing.

Masi Oka: Yeah I agree and I think that's what keeps it interesting and challenging. There's definitely something to be said about the familiarity that we want to give the audience with our character portrayals but, you know, the writers put us in very different situations and combinations and I think that's always the fun part.

So we might have a grip on our character, you know, like as we do in life as we grow the characters grow and evolve as well so there's always a constant change and surprise.