<P> "The Door" is the fifth episode of the sixth season of HBO's fantasy television series Game of Thrones, and the 55th overall . The episode was written by series co-creators David Benioff and D.B. Weiss, and directed by Jack Bender . </P> <P> Beyond the Wall, Bran Stark (Isaac Hempstead Wright) learns the origin of the White Walkers, and ventures out in a vision where he is caught by the Night King (Vladimir Furdik) allowing the White Walker army to enter the tree and forcing Bran to escape with the help of Meera Reed (Ellie Kendrick) and Hodor (Kristian Nairn). At Castle Black, Jon Snow (Kit Harington) plans to unite the north against the Boltons, and in the Iron Islands, Euron Greyjoy (Pilou Asbæk) is elected in the Kingsmoot with Yara Greyjoy (Gemma Whelan) subsequently stealing his entire fleet . Across the Narrow Sea, Tyrion Lannister (Peter Dinklage) decides to enlist the Red Priestess Kinvara (Ania Bukstein) in Meereen, and Daenerys Targaryen (Emilia Clarke) commands Jorah Mormont (Iain Glen) to heal himself of his greyscale . </P> <P> "The Door" received universal acclaim from critics, who found the episode to be emotional with effective action sequences involving the White Walkers and Hodor, in addition to providing "important answers on the show's mythos ." The adaptation of the Kingsmoot as well as Daenerys's farewell to Jorah were also listed as high points of the episode . It required between 9 and 10 hours to get the full body prosthetic ready for the Children of the Forest . Hodor's origin story was presented to the series co-creators by George R.R. Martin . In the United States, the episode achieved a viewership of 7.89 million in its initial broadcast . For the 68th Primetime Emmy Awards, Jack Bender was nominated for Outstanding Directing for a Drama Series . </P> <P> Sansa Stark confronts Petyr Baelish about his decision to marry her to Ramsay Bolton . He explains that he was ignorant of Ramsay's cruelty and begs for forgiveness . In exchange, he offers her the support of the Vale in her attempt to retake Winterfell from the Boltons, but Sansa declines . As he leaves, Littlefinger reveals that her great - uncle, the Blackfish, has retaken Riverrun with the Tully army; Sansa orders Brienne of Tarth to go and recruit the Blackfish for their cause . </P>

Who plays sansa stark in the play in episode 5