The ever-expanding capacities of computing offer new narrative possibilities for virtual worlds. Yet vast narratives--featuring an ongoing and intricately developed storyline, many characters, and multiple settings--did not originate with, and are not limited to, Massively Multiplayer Online Games. Thomas Mann's Joseph and His Brothers, J. R. R. Tolkien's Lord of the Rings, Marvel's Spiderman, and the complex stories of such television shows as Dr. Who, The Sopranos, and Lost all present vast fictional worlds. Third Person explores strategies of vast narrative across a variety of media,...