Oathkeeper

Missandei continues to teach Grey Worm the Common Tongue, the language of Westeros. Grey Worm and other Unsullied infiltrate the city, arm the slaves and incite a slave uprising that leaves Daenerys in control of the city. Despite Barristan's suggestion to offer mercy, Daenerys orders 163 masters crucified as justice for the 163 slave children crucified along the road to Meereen.

Jaime visits Tyrion in his cell and tells him that Cersei is still searching for Sansa.

Olenna prepares to return to Highgarden and implies to Margaery that she had a hand in Joffrey's death to protect Margaery from his cruelty. She also suggests that Margaery ingratiate herself with Tommen to curtail Cersei's influence; at night, Margaery visits Tommen in his chambers to discuss their marriage.

Jaime sends Brienne to find and protect Sansa and gives her armor and his Valyrian steel sword, which she names "Oathkeeper", and Podrick as her squire.

On the way to the Eyrie, Petyr tells Sansa that he plans to marry her aunt Lysa. He tells her that Joffrey's death will help him and his new allies grow strong, referring to House Tyrell, and that the missing stone in her necklace contained the poison used for the murder.

Slynt convinces Thorne to send Jon to kill the group at Craster's Keep, as Jon may be killed and not become Lord Commander. Jon gathers volunteers to join him, including Locke who arrived as a new recruit.

Karl orders Rast to give Craster's last son to the White Walkers. Bran's group hears the baby's cries and are captured by the mutineers when they investigate. A White Walker retrieves Craster's son and brings him to a fortress in the Lands of Always Winter, where their leader, the Night King, transforms the baby into a White Walker.

"Oathkeeper" established a new series high in ratings, with 6.95 million people watching the premiere.[11][12] In the United Kingdom, the episode was viewed by 1.598 million viewers, making it the highest-rated broadcast that week. It also received 0.112 million timeshift viewers.[13]

Like the season's other episodes, "Oathkeeper" received acclaim from critics, with Rotten Tomatoes counting 97% positive reviews from among 36. The site's consensus is that "If it's a bit more subdued than its predecessors, 'Oathkeeper' is nonetheless a rock-solid installment of Game of Thrones – one that features assured direction, strong action scenes, and intriguing plot developments."[14]

Eric Goldman and Roth Cornet of IGN commented on the episode being a "game changer" because it diverges from the book series more than any other Game of Thrones episode; a few of the changes include Jon's and Bran's storylines, how Daenerys conquered Meereen, and new information with regard to how White Walkers multiply their army. Goldman and Cornet stated that much of the episode feels like a spoiler for readers of the series because of the changes, including the show creators, who know how the ongoing book series will end, possibly having incorporated aspects that happen later in the books. Though Goldman and Cornet indicated that significantly diverging from the books could be detrimental to the show, they credited "Oathkeeper" with adding an element of surprise and intrigue for all viewers.[9]

Writing for The A.V. Club, Emily St. James (writing for viewers who have read the books) and Erik Adams (writing for viewers who have not) both gave the episode a B.[15][16] St. James commented that the scenes between Jamie and Cersei "seems to truly want us to think that what happened last week wasn't, in any way, rape" and wondered "whether the show is going to acknowledge it at all."[15] Adams notes how the episode serves as a "bridge" between episodes and plotlines well under way, but that there are "thematic riches" to be found; namely, the multiple searches for justice.[16]