Prime Video's Countdown could return for a season 2 - but will Eric Dane reprise his role amid his ALS battle? The show, which premiered in June 2025, follows an LAPD detective (played by Jensen Ackles) who is recruited for a covert task force of undercover agents from various law enforcement agencies after a Department of Homeland Security officer is killed in plain sight. The group must track down the murderer - but there is a larger conspiracy at work that they need to uncover while racing to protect Los Angeles.