A revival of the beloved Dexter series, this one is set fifteen years before the events of the original and dives into the formative years of Dexter Morgan, the forensic prodigy who moonlights as a meticulous serial killer. The cancellation came as a surprise, especially since the show had climbed Prime Video’s Top 10 streaming charts just days before the announcement and was #6 on the Nielsen TV charts in the US in the week of its debut. Despite topping Nielsen and Prime Video’s internal charts during its summer run, Countdown was canceled in October 2025, with Amazon noting “global viewership below expectations” as a reason for pulling the plug.