Hold the door, because we haven’t seen the last of Hodor yet.
Hodor, after saving Bran’s life by literally holding the door as the White Walkers tried to claw their way through (we still haven’t fully recovered), was turned into a White Walker and will be present (according to the theory) at the Battle of Winterfell in episode three.
The theory goes even further, suggesting that if/when the Night King arrives at the Godswood to kill Bran (whom Theon is supposed to be protecting), he’ll bring giant White Walker Hodor along with him for more psychological trauma. Perhaps Bran will have to watch Hodor come attack him before Theon kills him. Or Jon Snow will have to kill Hodor, since it would be pretty distressing for Jon, too. Plus, there’s an image of Jon wielding a sword in the Godswood in the episode three trailer. Benioff and Weiss, you’ve gone too far.