"Game of Thrones" Season 4, Episode 8 is titled "The Mountain and the Viper." The episode focuses on several key events and developments, including the trial by combat between Oberyn Martell and Gregor Clegane, the continued struggles of Daenerys Targaryen in Slaver's Bay, and the arrival of Stannis Baratheon at the Wall.
At the beginning of the episode, Tyrion Lannister's trial for the murder of King Joffrey Baratheon continues. As the last chance for his innocence, he demands a trial by combat, and Prince Oberyn Martell agrees to fight on his behalf.
Oberyn faces off against Gregor Clegane, known as The Mountain, in the trial by combat. Oberyn, seeking revenge for the murder of his sister Elia and her children, puts up a strong fight, but ultimately loses and is killed by The Mountain.
In King's Landing, Tywin Lannister sentences Tyrion to death for the murder of King Joffrey.
Meanwhile, Daenerys Targaryen continues to rule Meereen and struggles to maintain control over the city and its people. She is faced with several challenges, including a rebellion led by the Sons of the Harpy, and the continued resistance of the slave masters.
In the North, Jon Snow and the Night's Watch, along with Stannis Baratheon and his army, prepare to defend the Wall against the advancing army of the dead.
The episode ends with Tyrion being taken away to await his execution, and Jon Snow and Stannis Baratheon leading their forces into battle against the Night King and his army.
In summary, "The Mountain and the Viper" is a pivotal episode that centers around the trial by combat between Oberyn Martell and Gregor Clegane. Oberyn, seeking revenge for the murder of his sister Elia and her children, puts up a strong fight but ultimately loses and is killed. Tyrion is sentenced to death for the murder of King Joffrey, and Daenerys continues to struggle to maintain control over Meereen. In the North, Jon Snow and Stannis Baratheon lead their forces into battle against the Night King and his army, as the Night's Watch and the wildlings defend the Wall against the advancing army of the dead. The episode ends with Tyrion being taken away to await his execution.
