William Moseley arrives for the World Premiere of his film, The Chronicles of Narnia, The Lion, The Witch, and The Wardrobe, at the Royal Albert Hall, London, Wednesday Dec. 7, 2005. (Photo: Max Nash/AP Wide World)

William Moseley plays Peter Pevensie in the upcoming Disney movie, The Chronicles of Narnia: The Lion, the Witch, and the Wardrobe. Peter is the oldest of three siblings who discover another world in the back of a wardrobe while playing hide-and-seek. At 17, this is Moseley's first film.

Snagging the role of Peter was no easy task. Moseley realized he wanted to pursue acting at the age of 10, when a woman came to his elementary school looking for a child actor for a TV drama. He didn't get that part, but he got an agent and continued auditioning for the next five years. Although Moseley went to many callbacks, he never got a part—until now. The same woman who came to his elementary school was also casting Narnia. She remembered him and asked him to audition for the part. A year and a half later, after a long series of auditions, he was cast as Peter.

"I'd been rejected so many times [that I was shocked] just to get the part…I was crying, I was so happy. I couldn't actually believe it," said Moseley in an interview.

The movie was filmed in New Zealand, and Moseley said he was "blown away" by the sets. Many scenes bring together the actual landscape and computer graphics. Part of his challenge in this film was acting opposite characters like Aslan the lion and the Beavers, who were created completely from special effects. When he finally saw Aslan on screen, he was convinced that someone had tamed a real lion!

"I honestly believed it was a real lion they got from the zoo and got to walk down the street," he said.

Look for Moseley and the entire cast in theaters on December 9.