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The third season of Game of Thrones is based upon the first half of A Storm of Swords, the third book in George R.R. Martin's A Song of Ice and Fire series, and will see the show's already enormous cast bolstered by several newcomers to Westeros, including Brynden Tully (Clive Russell), Edmure Tully (Tobias Menzies), Beric Dondarrion (Richard Dormer), (Oldenna Tyrell (Diana Rigg), Ramsay Snow (Iwan Rheon), Selyse Baratheon (Tara Fitzgerald), Thoros of Myr (Paul Kaye) and Orell (Mackenzie Crook), as well as Mance Rayder (Ciaran Hinds), the 'King-Beyond-the-Wall'.
Check out the teaser here:
Game of Thrones season three will premiere on HBO on March 31st, 2013.