Gaunt and sharp-featured, Benjen is Lord Eddard’s only surviving sibling. He joined the Night’s Watch in the aftermath of Robert’s Rebellion, and has since risen to the rank of First Ranger, making him one of the chief officers on the Wall and a potential successor to the office of Lord Commander. Very skilled in ranging beyond the Wall, Benjen’s name commands respect.
On the show, Benjen is around 40 whereas he is around 30 in the novels.
Coming to Winterfell to meet with King Robert, Benjen finds that Jon is interested in joining the Watch. He departs with Jon and Tyrion in his company, taking them to the Wall. There, Benjen insists Jon complete his training, just as any other man of the Watch, while revealing his distaste for Tyrion Lannister. He is sent ranging beyond the Wall by Lord Commander Mormont to try and find sign of Ser Waymar Royce, and is not heard from again. The body of his two companions, Othor and Jafer Flowers, are found in the weirwood grove north of Castle Black. Brought back within the castle to be examined, at night they awaken and attempt to murder Lord Commander Mormont and other men of the Watch.