'Game of Thrones' Season 2 primer: Who are the players?

Spoiler alert! If you have not caught up with "Game of Thrones," read at your own risk. As Season 2 of HBO's "Game of Thrones" begins Sunday, King Joffrey's beheading of Lord of Winterfell Ned Stark has brought war to the kingdom. So many factions are challenging Joffrey's right to the Iron...
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