The "Twilight" star was at day three of Comic-Con in San Diego. She told the crowd that doing a sweet, traditional Snow White was not something "I was jumping at." What attracted her was that this Snow White was a bold leader with her feet firmly on the ground.
"Also, I get to have a sword and stuff," Stewart said. "Really cool weapons."
Stewart dons armor and wields a huge sword and shield in the movie.
Charlize Theron will play the evil queen and Chris Hemsworth will play the huntsman.
The movie is due out next June and is one of two "Snow White" movies Hollywood has coming. The other, due out next March, features Julia Roberts as the evil queen.
The Associated Press contributed to this story.