Some television shows end exactly when they should. Others leave fans convinced there was still one more great story waiting to be told. Even after all this time, many viewers would happily come back for just one more season to see where the story could have gone. IMDbMindhunter (2017–2019)The show’s slow build toward the BTK Killer and other infamous cases made its indefinite hiatus especially frustrating for crime drama fans. IMDbFirefly (2002)Canceled after just one season, it became one of television’s greatest cult classics, with fans still hoping to spend more time aboard Serenity.