Kristen Bell—who has become a cult favorite for her roles in Heroes, Fanboys and Veronica Mars—is likely to extend her following as she lends her voice to the ultimate sci-fi franchise: She plays the new girl in Imagi Studios' upcoming 3-D animated feature-film version of the venerable Japanese Astro Boy series. "I play Cora, who is a girl who befriends Astro when he comes down from Metro City onto the surface of Earth," Bell said in an interview last week at the Saturn Awards in Burbank, Calif.