Josh Schwartz, creator of The O.C., fills the ironic-teen-soap void that's been open since, well, The O.C., was canceled. Manhattan prep schooler Serena (Blake Lively) returns from a mysterious exile and shakes up Upper East Side society. Packing a sharp designer shiv, this clever saga of haves vs. have-mores proves the East Coast can be as enjoyably sudsy as the West.