10. Gregor Clegane
It is a shame that the only real lasting image we have of "The Mountain" was back in the very first season; it is difficult to forget a scene that results in the form of a headless horse. Unfortunately, he was barely recognizable in the second season and completely absent from the third. I was thrilled to know that the role has been appropriately cast for the fourth season and am hoping that viewers are finally reacquainted with the type of monster this juggernaut truly is. I'm glad viewers will have another individual they can truly despise and one who poses a real physical threat to almost every other character in Westeros. He is nowhere near as sympathetic as his brother Sandor can at times be and feels absolutely no remorse for any of his horrendous actions. It will be interesting to see if anyone will even bother to rise to the occasion and meet him head on. Perhaps a certain lion? A powerful stag? Who knows, maybe even a viper?