Snowpiercer

To reverse global warming, chemicals are released into Earth's atmosphere to make the planet cooler. The plan backfires and freezes most of the inhabitable world.

Snowpiercer starts shaking because of rough tracks, triggering avalanches. Meanwhile, the Tailie rebellion's leaders are put into stasis, and Ruth oversees a little girl's punishment for her involvement.

As unrest grows, Melanie organizes a fight night as a distraction with a promise to upgrade the winner to Second Class, but the fight turns into a riot that must be broken up.

Nikki is murdered by the man who had visited her. He is now on the loose. With the border between different parts of the train closed due to the riot, he is trapped in Third Class.

Till moves to Second Class after she and Jinju marry. In the Drawers, Layton has nightmares about stopping the cannibal gangs that used to terrorize the Tail. LJ's tribunal begins.

A recovering Layton is taken to Dr. Pelton by Josie. There turns out to be a blacklist for the Drawers, people Pelton believes to be enemies of the state targeted for imprisonment, a list which contains Layton, Josie and her.

Melanie promotes Miles to Engineer Apprentice to replace the man killed stopping the derailment and he is taken by Melanie to work in the Engine itself; when Josie makes contact with him, Miles promises to do his part in the upcoming rebellion.

Miles shows LJ the truth about Melanie; after LJ informs her parents, Ruth turns on Melanie and imprisons her to await execution.

First begins executing captured revolutionaries while offering Layton an ultimatum through Pike: surrender or they will kill everyone; after learning that Zarah is pregnant with his child, Layton agrees to take the deal.

In the aftermath of the revolution, Melanie officially hands over control of Snowpiercer to Layton who plans to set up a democratic government.