8. The Mountain and the Viper
Season 4, Episode 8: "The Mountain and the Viper"
Played with swagger and style by Narcos' Pedro Pascal, Prince Oberyn Martell was the breakout star of the show's fourth season — horny, funny, and deadly in equal measure. The Red Viper had come to King's Landing to seek vengeance against House Lannister and its chief goon for their role in the death of his family back in the day. There's just one problem: Gregor "The Mountain" Clegane, portrayed by world-class strongman Hafþór Júlíus Björnsson, is the biggest, scariest, toughest creep in the Seven Kingdoms. Just when it seemed the prince had defeated the behemoth, the Mountain rallied just long enough to confess his crimes … and crush the Viper's skull like a casaba melon. Gross even by GoT standards, the moment left us as shocked as the Imp.