All Available Season All Season Specials Jan, 0001 2 episodes 0.0 Season 1 Apr, 2009 7 episodes 6.7 Season 2 Mar, 2010 6 episodes 8.5 Season 3 Jan, 2011 10 episodes 8.3 Season 4 Jan, 2012 10 episodes 8.2 Season 5 Feb, 2013 10 episodes 8.1
