Check out the official trailer for Countdown! Streaming on Amazon Prime June 25, 2025. After a suspicious murder in broad daylight, LAPD officer Mark Meachum is recruited to join a secret task force of undercover agents from all branches of law enforcement to investigate. But as the truth of a more sinister plot comes into focus, the team must overcome their conflicting personal agendas to unite and save a city of millions. © Amazon MGM