Oathkeeper

Nairn appears as Hodor in season four, episode four, Oathkeeper, with Isaac Hempstead-Wright as Bran Stark, Thomas Sangster and Ellie Kendrick as Jojen and Meera Reed. North of the Wall of Westeros, Bran uses his psychic powers to enter the mind of his direwolf, Summer, to investigate the sounds of a child crying nearby. Summer is trapped by mutineers from the Night’s Watch who have taken over a keep north of the Wall. The rest of the party is then also captured. Bran is forced to reveal his identity as a Stark. The mutineers torment Hodor as he is chained to a wall.