Gallery: 'I was fed up of dealing with idiots. . . ' The movie roles that made these stars QUIT Hollywood! (BANG Showbiz)The former 'Game of Thrones' star - who played Theon Greyjoy on all eight seasons of the HBO fantasy series between 2011 and 2019 and won an Emmy Award for Outstanding Supporting Actor for his role - went on to explain that his fellow castmates were "so supportive" and that while he grew up taking part in amateur dramatics, he still gets nervous backstage.