John Manard · CC BY-SA 4.0

Voiced the title character in Pixar's Finding Nemo while still a child, giving one of the most-heard performances of any young actor of his generation. He went on to play Shane Botwin, the drug-dealing suburban teenager at the center of Showtime's Weeds, earning two Screen Actors Guild Award nominations for a role that required real dramatic range rather than just kid-voice charm.