From Arya to Tyrion - 'Game of Thrones' season 3 primer
Where were Arya, Cersei, Bran, Tyrion and Hodor when Season 2 ended?
Brienne of Tarth (Gwendoline Christie)
After beating herself up for failing to prevent the assassination of her sworn liege Renly, Brienne takes a new oath in support of Catelyn Stark, and follows Catelyn's orders to liberate Jaime Lannister from Robb's camp and escort him to King's Landing in an attempt to exchange him for Sansa and Arya Stark.
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