O'Connor big break was in 2014 as Olly in the HBO fantasy television series Game of Thrones. The character was introduced originally as a one episode character, to further the story between the Wildlings and the Night's Watch at Castle Black, but was kept on the show to provide more backstory surrounding the deaths of Ygritte and Jon Snow in the fourth and fifth seasons, respectively. O'Connor appeared in seventeen episodes throughout the series, with his last appearance in the sixth-season episode "Oathbreaker," when he was hanged by a resurrected Jon Snow.
