Aidan Gillen (Tommy Carcetti)
Most Recent Projects: Game of Thrones (2011-2013), The Dark Knight Rises (2012), Shadow Dancer (2012), The Good Man (2012)
The Prognosis: Like the big studios during the early days of Hollywood, HBO has a grip of regular actors the network uses to populate its shows. Irish actor Aidan Gillen has benefited from this, and landed a recurring role as Petyr Baelish, aka Littlefinger, aka the man with the keys to the brothel, on Game of Thrones. Wheeling and dealing in Baltimore, forging alliances in King's Landing—it's all the same.