18. "Second Sons" (Season 3, Episode 8)
Sex and sorcery drive this Season Three highlight. This being Game of Thrones, there's some venn-diagram overlap between the two categories, courtesy of the fiery priestess Melisandre's leech-based sex magick ritual with the hunky young blacksmith Gendry. Elsewhere, nerdy Night's Watchman Samwell Tarly slays a fearsome White Walker, and Daenerys slithers out of her bathtub in the buff, "When Doves Cry"–style, to impress a macho mercenary. But it's what doesn't happen — Tyrion Lannister refuses to force himself on his miserable child bride Sansa Stark — that elevates the episode.