Game of Thrones - Season 4, Episode 7 Synopsis
 

Episode 4-7
Title: "Mockingbird"
Directed by Alik Sakharov
Written by David Benioff & D. B. Weiss
Original Air Date -- May 18, 2014

After learning that Cersei has appointed Gregor Clegane as her champion in the upcoming trial by combat, Tyrion is desperate to search for someone to be his champion. When both Jaime and Bronn refuse to fight for his cause, Oberyn Martell steps up, seeing a chance to avenge his sister. Daenerys has sex with Daario, before sending him off on a mission to deal with the resurgent slavers at Yunkai. Melisandre and Selyse prepare for their departure of Dragonstone, and Jon Snow faces off against Alliser Thorne over the incoming Wildling threat. Arya and the Hound come across some people from her past: Rorge and Biter. The Hound is wounded but refuses to cauterize his injury. Brienne and Podrick meet another of Arya's former companions, Hot Pie, and learn of her survival and her time with the Brotherhood. They then resolve to travel to the Vale, reasoning she would go there in search of living relatives. In the Vale, Sansa is kissed by Petyr Baelish in the snow, raising the wrath of her Aunt Lysa, who witnesses the event and later threatens to push Sansa through the Moon Door. However, Baelish intervenes in time and instead pushes Lysa to her death.

Source: http://en.wikipedia.org/wiki/Game_of_Thrones_(season_4)