The Snowpiercer crew marvel as a rocket shoots through the sky, crashing nearby. Melanie sends Till and Ben to investigate. Flash forward to nine months later, New Eden blooms.
Milius and his Animal Squad storm the train. Melanie realizes something is wrong and shuts the vault doors to the engine. But when Ben's life is threatened, Melanie surrenders the engine.
Layton demands to use Big Alice to rescue Liana. Ruth, now Mayor of New Eden, refuses because it's the town's power supply. Layton makes Javi jury-rig a solution, giving them three weeks of electricity.
Thomas Rainwater and a work crew discover the graves and bones of the bodies buried by Kayce and Danny. A ranch worker is concerned that John should not be riding horses, and it is revealed that he has colon cancer and recently had surgery to have part of his colon removed. Kayce arrives at the ranch with Tate. Tate and John go to the river, where they gather wood to start a fire. Tate falls into the river, and John rescues him. Jimmy struggles with finding his footing in the ranch, and gets int
Layton hears the deal: Liana for Big Alice. He agrees and the trains dock at the silo. While Layton, Ben, Till, Ruth, and Alex stew in a holding room, Josie is taken to Headwood. Milius introduces his partner in crime: Wilford.
Nima needs more samples for his experiments, so Milius sends Wilford and the soldiers to collect. Privately, Milius tells Wolf to kill Wilford. Layton wakes up on an abandoned floor and is approached by humans with toxic gas scars.
Layton learns who was responsible for the experiments on Josie and Liana, before also finding out who froze the world.
Big Alice pulls into New Eden. Layton, Josie, and Liana sit stranded in the middle of nowhere, freezing to death, when a masked soldier appears. Can he rescue them? Alex finds herself in danger.
Alex sabotages the track switch computer and, with Layton's help, escapes to town hall. Till gets the drop on Ace and uses his sniper rifle to save Layton and Alex from Rat. Melanie reveals the identity of Alex's biological father.
Nima heads for Snowpiercer. Layton and the Tailies fight their way uptrain when Ruth is captured. Nima tries to cut a deal and runs to the rocket control room to initiate the launch sequence, but who is trying to sabotage the rocket?