For the second year, an NBC series has taken the title of most-pirated TV show, with 6.58 million downloads from file-sharing sites for a single episode in 2009, reports the Torrentfreak blog.

The show is "Heroes."

This year, for the first time, both NBC's “Heroes” and Showtime's “Dexter” lodged a single-episode download that surpassed their average weekly viewership. “Heroes” draws on average 5.9 million viewers weekly on TV.

http://torrentfreak.com/top-10-most-pirated-tv-shows-of-2009-091231/