In a world where musical theater devotees and sci-fi fans yearn for common ground, the trailer for Dr. Horrible's Sing-Along Blog grabs you by the lapels and sings, "I am that rare beast of boogie-woogie/for fans of Buffy/and fans of Doogie." Penned during the writers strike (ssshh!), the three-part internet series (helmed by Buffy creator Joss Whedon) stars Neil Patrick Harris as timid villain Dr. Horrible, who's about as skilled at wooing cute girls as he is at defeating good guys — which is to say, not very. Two pressing questions: how will Whedon fare in a medium free of low ratings and premature Fox cancellations? And also, is Neil Patrick Harris doomed to play a blogger for the rest of his career?