Series premiere. Snowpiercer, the great ark train, circles a frozen earth keeping humanity’s last survivors alive - until a murder onboard threatens the established order. Starring Jennifer Connelly and Daveed Diggs.

Layton investigates the murder while gathering intel for his revolution. Melanie faces a resource crisis that could impact everyone.

Layton descends into the black market, while Melanie stages a prize fight to defuse class tension.

A twist in the murder investigation brings Layton face-to-face with the murderer, and dangerously close to Melanie's secret.

Tensions between Third Class and First Class are boiling as Melanie stages the trial of the Snowpiercer killer. Third Class threatens a work stoppage, demanding representation on the jury, and Melanie makes a fateful decision about who to favour.

Layton lays track for revolution, while Melanie faces an engineering emergency that threatens every soul on Snowpiercer.