premise: There are one or more seasons of Heroes.
hypothesis: Heroes is an American psychological thriller science fiction television drama series created by Tim Kring that appeared on NBC for four seasons from September 25 , 2006 through February 8 , 2010 . Four complete seasons aired , ending on February 8 , 2010 . 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 .