An average of 3.5 million viewers tuned in for Sunday's season finale of
That's the biggest audience ever for the 9 p.m. cable drama and 50% higher than the 2.3 million who watched the show's premiere.
The show's big closer faced heavy competition on cable and broadcast networks, including the premieres of
McConaughey and Harrelson played investigators hunting for a Louisiana serial killer.
A total of 11 million people have watched the series to date, which marks the highest gross viewership for a first-season HBO series since