User blog comment:DarkIngRidley/What ''old friend'' do you think is gonna appear in Season Seven, Episode Twelve??/@comment-3481504-20120103190920/@comment-3481504-20120103195107

You're right, it would be cool to see him again! I too think he'll make at least more appearance. But there are others with the capability of killing the Leviathans, e.g., God and archangels.