Q: Since you're the title star of this film, they have you on all the advertising material. Is it surreal to see yourself on the billboards?

BEN: L.A. is a really dangerous place to be this week if you're me. You just don't drive down Sunset Boulevard because it's dangerous. They just leave me completely breathless. You get this slight tingle of nerves. You're not quite sure why because it's this eight-story man on a building looking down at you. You know it's you and a character you've played, and there's a part of you that refuses to acknowledge that, and you think, "Who's that guy?" It's a very difficult emotion to explain. It's almost quite confusing to see yourself on those things and then you rationalize and think it's a marketing campaign, it makes sense. They put on hair extensions and they look good. It's a tan; it's not really me. A few weeks ago I met a journalist and he said, hi and slammed an action figure in front of me, and said, what do you think? Someone says there's going to be an action figure and you think, aw, amazing, I played with He-man and Transformers, and you realize what you did with your He-man and Transformers, which is smash them against each other and chew their arms off. You think it's cool to have an action figure if it's a collectible in a box, but what they're there for is for people to smash them up, which is kind of weird again.

Q: You came into this project with four young actors who already knew each other from the first one. Did they make you feel welcome?

BEN: Completely. When I got the part, I got the DVD and watched all the DVD extras. I listened to Georgie sit there and go, "William [Moseley] is like my brother. And Andrew [Adamson] is like the dad when the dad's not there, and it's all nice," and I'm like, "Get me a bucket. I don't believe you." Then I walked in the production office on the first day and they were playing table tennis with each other and they were sitting on each other's laps and sharing ice cream. It was something out of a Disney film. It really was a family atmosphere on set. They were all very welcoming and Anna and Will were a little emotional last night knowing this was their last one. What people don't realize is that Anna is now 19 and Will is 21, and they were 13 and 15 when they first auditioned for these movies. It's a big part of your childhood to give up to a project of this size. I think it's 100 percent worth it. They've got something really to show for it. It's emotional for them. It's hard for him to give me the sword at the end of the movie.

Q: When you saw yourself, were you pleased with your performance?

BEN: It's difficult to watch yourself, to suspend your disbelief that far to not see yourself in the character you're playing. My heartbeat rate was heightened every time I was on screen, which is about the ego, isn't it. I was nervous I hadn't done myself justice because it seems like such a long time ago and such a different world.

Q: So are you now a master swordsman and horseman?

BEN: Hell yeah.

Q: What was the training? And how will you use it now?

BEN: Winning the hearts of damsels in distress on the streets. (Laughs) I did some solid horse training when I got there because I hadn't gotten any experience on a horse even though I might have suggested I did. I was literally on a horse five or six hours a day. I bought some padded cycling shorts to ease the comfort. And I had these great Spanish teachers who went through everything with me and eventually after a couple of weeks it clicked into place and as you can see I'm going through rivers and riding with flaming torches up and down ramps and through trees and it was amazing. It's totally exhilarating. It's like a ride at Disneyland. It's fantastic.

Q: And the sword skills?

BEN: I actually had to do more throughout filming. The battle sequences were at the end so we knew we had time. The sword fighting is as fun as it looks and I can't lose because I'm in the next film.

Q: Are you going to add more humor into the next one given that this movie and book is more heavy emotionally?

BEN: I was talking to my brother about it last night and he said, you're parents have been killed and they're chasing you trying to kill you, why wouldn't you take it seriously, and I thought, "Good point." So he made me feel better about that. So I think it works. Caspian is an earnest character. That's who he is. In the next film he's not suddenly going to become this macho musing quipping king. I think he's a bit of a lost soul. He hasn't been parented. He's been brought up by someone who essentially doesn't care about him at all and is just waiting to have his own heir so he can get rid of him. That's not a very loving environment to be brought up in. The closest thing he has is his professor. If you read the book, he only had a couple of years with him and before that, a nurse. So it skips those years because the film can only be so long. There's only so young I can play. We're pushing it as it is. He's an interesting character. I'm curious to see how he develops.

Q: You're shooting the next movie in October. Do you have time to shoot anything else before then?

BEN: I shot a film with Colin Firth and Jessica Biel called "Easy Virtue." it's a Noel Coward play adaptation. It's a very different British farce, kind of a posh "Meet the Parents." It's very different again. And I hope to be doing something in the summer. I don't know exactly what yet.

Q: How many Narnias are you signed on for?

BEN: We're definitely making Dawn Treader, but beyond that I don't know.

Q: How many more books is Caspian in?

BEN: He's in the "Dawn Treader" and then he's much older, much older in "The Silver Chair." He's like 70. So who knows what they'll do with that.

"The Chronicles of Narnia: Prince Caspian" opens in theaters May 16th.