Game of Thrones' ''Blackwater'' episode was justifiably praised for its movie-worthy vision of an epic medieval battle. But for my money, the best parts of the episode belonged to Lena Headey. Holding court in Maegor's Holdfast with the women, servants, and guardsmen, Cersei Lannister got gloriously drunk and delivered an assortment of drop-the-mic lines like ''The gods have no mercy. That's why they're gods.'' Headey brings a grim determination, at once fatalistic and amused, to every word Cersei says. —Darren Franich