Every generation produces a counterculture icon. Joss Whedon, creater of the long-running television series Buffy the Vampire Slayer, is famed for his subversive wit, rich characters, and extraordinary plotlines. His renown has only grown with subsequent creations, including Angel, Firefly, Dollhouse, and the innovative online series Dr. Horrible's Sing-Along Blog. Through premises as unusual as a supernatural detective agency run by a vampire and...