Full spoilers for Game of Thrones’ Season 7 premiere, “Dragonstone,” continue below.
“The cold open wasn’t initially the cold open,” explained co-showrunner Dan Weiss. “We had organized the episode a bit differently. But when we saw David Bradley’s performance, and seeing the subtle move that he made to not quite be Walder Frey but to start as Walder Frey and end as Arya Stark, that made us realize that this was the best way to open the episode of this season.”
In the cold open, Arya disguises herself as Walder Frey, summons all the Freys to a new feast, and then proceeds to poison and kill them all, wiping out all of the Freys.
Source:: IGN -Reviews