15. 'The Watchers on the Wall' (Season 4, Episode 9)
If you thought that Game of Thrones' second Neil Marshall-directed, episode-long battle might suffer from diminishing returns, you thought wrong. The wildling assault on the Wall was a thing of icy, bloody beauty. From giants to mammoths to enormous ice scythes, the jawdropping spectacle brought out that epic-fantasy feeling. Meanwhile, super-tight fight choreography, including a continuous 43-second crane shot that covered the entire battleground in Castle Black, kept the carnage real. Finally, the deaths of Jon Snow's friends Pyp, Grenn – and especially his savage ex-girlfriend Ygritte – turned triumph into tragedy.