The series, which also stars Jessica Camacho, Eric Dane, Violett Beane, Uli Latukefu and Elliot Knight, follows Ackles's character, an LAPD detective called Mark Meachum.
However, as they hunt the killer they soon uncover a far more sinister plot than they could have imagined, which starts a race against time to a city.
Read on for everything you need to know about the release schedule for Countdown.
When will Countdown episode 4 be released on Prime Video?
The remaining episodes will now arrive weekly on Wednesdays, meaning that episode 4 will be released on Wednesday 2nd July.
The series has been created by Derek Haas, who is one of the creators of the One Chicago franchise.
Countdown release schedule
You can find the full release schedule for Countdown right here:
Episode 1 – Wednesday 25th June (out now)Episode 2 – Wednesday 25th June (out now)Episode 3 – Wednesday 25th June (out now)Episode 4 – Wednesday 2nd JulyEpisode 5 – Wednesday 9th JulyEpisode 6 – Wednesday 16th JulyEpisode 7 – Wednesday 23rd JulyEpisode 8 – Wednesday 30th JulyEpisode 9 – Wednesday 6th AugustEpisode 10 – Wednesday 13th AugustEpisode 11 – Wednesday 20th AugustEpisode 12 – Wednesday 27th AugustEpisode 13 – Wednesday 3rd SeptemberCountdown trailer
You can watch the trailer for Countdown right here now.
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