Nairn’s character, Hodor, appears in episode 10 of season three, Mhysa. He accompanies Bran Stark, played by Isaac Hempstead-Reed, and Jojen and Meera Reed, played by Thomas Sangster and Ellie Kendrick. The group take shelter in a castle on the Wall that has been abandoned by the Night’s Watch. They encounter Samwell Tarly, a Nights Watchman played by John Bradley-West, and his companion Gilly, a wildling woman played by Hannah Murray. After initial mistrust the two groups realise that they are no threat to each other. Samwell gives the other group a valuable gift of magical weapons that can assist against the undead White Walkers north of the Wall. The groups separate with Samwell and Gilly remaining south of the Wall and Bran, Hodor, Jojen and Meera heading north.