Warning: "Game of Thrones" book spoilers and TV show spoilers contained in this article.
In the "A Song of Ice and Fire" novels, a creature known as the Night's King has been mentioned and subsequently speculated about by fans of the series. In "Game of Thrones" Season 4, episode 4 "Oathkeeper," viewers finally meet him.
The crowned White Walker at the end of the episode that turns one of Craster's sons into a White Walker is the Night's King, according to the official HBO synopsis of the episode. That's pretty game-changing news for the TV series, as it is officially giving answers and exposition not in the George R.R. Martin "A Song of Ice and Fire" novels.
Update: HBO seems to have altered its posted synopsis and taken out the mention of the Night's King. Here is a screenshot of the original posting, which was posted to Reddit.
Will the Night's King reappear any time soon in "Game of Thrones"? Not likely, as that was Craster's last son. But it's a fantastic tease about the character, and proof that he is in fact alive and leading the White Walkers. It's unconfirmed who the other White Walkers standing around him are, or what his origin is.
There has been plenty written about the Night's King that can be found online, but for a spoiler-filled explanation of his character, read the Wiki of Ice and Fire entry here.
"Game of Thrones" airs Sundays at 9 p.m. ET/PT on HBO.
Photo/Video credit: HBO