'Game of Thrones': Everything You Need to Know About the White Walkers

Game of Thrones is almost back (thank the Old Gods, the New Gods, the Lord of Light, the Many-Faced God, and The Drowned God), so it's time for a refresher on one of the most important elements of the show: The White Walkers. These ancient, terrifying, mummy-like antagonists with their ice zombie army are becoming increasingly vital as Game of Thrones races towards its inevitable conclusion. As everyone and their mother (i.e. Cersei) is vying for the Iron Throne, a desperate few know that the tr...