In the third episode "The Long Night", the Army of the Dead marches on Winterfell and nearly wipes out the combined armies of the living. The Night King eventually reaches the Godswood, kills Theon Greyjoy, and prepares to strike down Bran. However, the Night King is ambushed and killed by Arya Stark with the Valyrian steel dagger that Bran had previously given her ("The Spoils of War"), which causes both him and the other White Walkers to shatter and results in the complete obliteration of the Army of the Dead.