Game of Thrones - Season 7, Episode 6 Synopsis
 

Episode 7 - 6
Title: "Beyond the Wall"
Directed by Alan Taylor
Written by David Benioff & D. B. Weiss
Original Air Date - August 20, 2017

At Winterfell, Littlefinger plots to isolate Sansa. Tensions between Arya and Sansa increase following Arya's discovery of the letter Sansa was forced to write, begging for Robb's fealty to Joffrey. Sansa, in turn, finds Arya's collection of faces she took from Braavos. At Dragonstone, Tyrion counsels Daenerys about the upcoming negotiations with Cersei. Beyond the Wall, Jon and the men hunt for a wight to prove the White Walkers' existence. After capturing one, the group is beset by the White Walker army. Jon sends Gendry to Eastwatch to dispatch a raven to Daenerys requesting help. During the night, an injured Thoros freezes to death. Right as the wight army is about to overwhelm Jon's party, Daenerys arrives with her dragons and rescues the men. However, the Night King, leader of the White Walkers, kills Viserion, one of Daenerys' dragons, with an ice spear. Daenerys flies off with the men, but is unable to save Jon. Benjen Stark intervenes and sacrifices himself to allow Jon to escape. When Jon and Daenerys are reunited, Jon pledges himself and the North to Daenerys as Queen. The Night King reanimates Viserion, making the dragon a part of his army.


Source: https://en.wikipedia.org/wiki/Game_of_Thrones_(season_7)