While various factions of Westeros are busy battling each other for the Iron Throne, a mysterious, supernatural being is lurking in the North with an army of undead. The Night King is featured prominently in the new teasers for season 7 of “Game of Thrones,” which means we are likely to see a lot more of the character. Here’s a quick guide to catch you up before the new season airs. WARNING: POSSIBLE SPOILERS AHEAD
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