The Mountain and the Viper
Dinklage appears as Tyrion Lannister in the eighth episode of season four, The Mountain and the Viper. Prince Oberyn Martell of Dorne is played by Pedro Pascal, and the knight known as The Mountain, Ser Gregor Clegane, is played by Hafþór Júlíus Björnsson. Oberyn faces The Mountain in Tyrion’s trial by combat for regicide and gains the upper hand with his dynamic fighting style. However the severely injured Ser Gregor is able to win the bout in devastatingly violent fashion, and Tyrion is declared guilty.