Game of Thrones season 4 episode 9 will be airing this Sunday, June 8, after last week's bloody battle, in which Tyrion was sentenced to death.

The official synopsis for this week's episode entitled "The Watchers on the Wall" is as follows: " on Snow and the rest of the Night's Watch face the biggest challenge to the Wall yet."

The episode title is the oath sworn by Night's Watch recruits. "I am the sword in the darkness. I am the watcher on the walls. I am the shield that guards the realms of men." This title hints that the Wall will be defended. In the book, this is about the Battle of Castle Black, a battle between the wildlings and the Night's watch.

Sunday's episode could also feature the return of Lady Stoneheart/ Catelyn Stark. Actress Lena Headey, who plays Cersei Lannister, teased fans on her Instagram page with a photo of stones placed in a shape of a heart. Fans speculate that she could appear through magic and hunt down those responsible for the Red Wedding and the downfall of the House of Stark.

Game of Thrones Season 4, episode 9 "The Watchers on the Wall," will be airing Sunday, June 8, at 9 p.m. ET on HBO, or alternatively can be watched online through live stream with HBO Go and HBO Connect.

Watch a promo video for Game of Thrones season 4 episode 9 below: