Nairn appears as Hodor in The Children, the tenth episode of season four, with Isaac Hempstead-Wright as Bran Stark, and Thomas Sangster and Ellie Kendrick as Jojen and Meera Reed. The group are continuing their journey north of the Wall of Westeros, and as they reach the point of exhaustion Bran realises that they have found their destination, the heart tree that he has seen in his dreams. They are suddenly attacked by undead creatures that rise out of the snow, but a mysterious child comes to their rescue. The group is forced to abandon one of their members, but the rest find safety in a cave with the unknown girl and other children. An old man reveals to Bran that he is the three-eyed raven who has brought him visions in his dreams.