Turns out, the genius who gave us not only the "Once More, With Feeling" musical episode of Buffy the Vampire Slayer but also Dr. Horrible's Sing-Along Blog is a big fan of Ryan Murphy’s new phenom. So when Twentieth (the studio behind Glee) approached him about the gig, pretty much his only reservation was scheduling.

"Joss directed one of the great musical episodes in the history of television on Buffy," gushes Murphy, "so this is a great, if unexpected, fit. I'm thrilled he’ll be loaning us his fantastic groundbreaking talent."