It’s official. NBC has cancelled “Heroes.”
The network seriously mulled bringing back “Heroes” for a shortened final season to wrap up the serialized show, possibly as a two- or four-hour movie.
In the end, given the fairly high cost of the drama, the show’s consistently declining ratings and the number of new hour-longs coming to NBC next season, the network decided the UMS-produced series wasn’t worth an additional episode order. [Source]