Dexter Cancelled But Could Get Prequel Despite becoming the most-watched series in the premium cabler’s history, “Dexter: New Blood” is not getting a second season. TV Line says Showtime has officially cancelled the revival, even though it averaged eight million weekly viewers when it aired in 2021 and 2022. The finale was the biggest Showtime finale in more than eight years. Reports indicate that very early talks have taken place about a possible prequel series. What other show or movie needs a prequel?