Who Is the Night King on Game of Thrones? Theories About Bran Stark and Other Origins

The prevailing theory is that, in his constant travels back in time, to try to save humanity, he’s basically created a series of time loops that sealed their fate. And it runs deeeeep. We’ve now seen evidence of Bran manipulating events in history at least twice and possibly more. 

For one, he caused a young Wylis to witness his own death in the future, which is what led him to be unable to say anything other than “Hodor” a truncation of the phrase “Hold the door,” which Meera shouted over and over as the White Walkers closed in.