As the train detours from New Eden, an environmental catastrophe threatens everyone onboard.

Reunited with old friends, the train throws a party. Alliances are tested as the truth is finally revealed.

While Wilford emphasizes his rule aboard his icy train, Layton’s pirate train continues its dangerous quest for warm spots, and comes across something entirely unexpected.

Alex must finally deal with her parental figures as a track obstruction uncovers a painful past.

A series of terrorist attacks threatens to derail Layton and Zarah’s big day.

As the bomber is revealed, Layton comes to terms with his past decisions before making an irreversible call.

On a divided Snowpiercer, Melanie intensifies her search for Layton while Layton is weaponizing her secret. Third Class faces a reckoning when he presents them with a choice.

Revolution has finally come. As Layton leads the lower classes forward in armed rebellion, Melanie’s house of cards collapses.

The rebel forces are on their heels when a dangerous foe joins them. A plan is hatched to take the train, but it may destroy them all.

Melanie fights for survival in treacherous conditions, vying to do what others before her could not.

An engineering catastrophe on Snowpiercer forces Layton to make a difficult choice, one that might cost him everything.

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…

As the train approaches Melanie’s retrieval point, Layton leads a furious attempt to try and pick her up but not without some sacrifices.

Hiding out with help from his allies, Layton lays track for revolution and an engineering emergency threatens every soul on Snowpiercer.

Layton uses his new position as train detective to investigate the murder while gathering intel for the revolution on the side. Meanwhile, Melanie faces a resource crisis, with potentially drastic…

The hospital is still in quarantine as Dr. Shaun Murphy continues to be overwhelmed by the chaos and noise in the emergency room; Dr. Morgan Reznick struggles to keep her…

Dr. Shaun Murphy and Dr. Alex Park treat two patients who collapse at the local airport and whose symptoms point to an infection that may become airborne. The staff races…

The Legends must devise a plan to retrieve the last remaining fragments of the Spear of Destiny from the Legion of Doom. They find themselves in France at the height…

Mitch digs into Jackson’s past to get the answers they need to make the cure. Also, the rest of the team hunts for evidence related to the triple helix inside…