premise: Heroes first season averaged over a million viewers.
hypothesis: Heroes (TV series) . The critically acclaimed first season had a run of 23 episodes and garnered an average of 14.3 million viewers in the United States , receiving the highest rating for an NBC drama premiere in five years . The second season of Heroes attracted an average of 13.1 million viewers in the U.S. , and marked NBC 's sole series among the top 20 ranked programs in total viewership for the 2007 -- 2008 season .