As the train approaches Melanie’s retrieval point, Layton leads a furious attempt to try and pick her up but not without some sacrifices.
Those who are close with Layton grow anxious to learn their fates; Josie tests her newfound ability.
An engineering catastrophe on Snowpiercer forces Layton to make a difficult choice, one that might cost him everything.
Layton and Till investigate the murders. Wilford leads Miss Audrey down a dark path.
Melanie fights for survival in treacherous conditions, vying to do what others before her could not.
Layton and Miss Audrey make a risky play for Big Alice, but Wilford has his own plans.
As the Big Alice crew are granted shore leave on Snowpiercer, Layton and Wilford have differing opinions on the future.
Mr. Wilford has arrived. And as this new threat rattles Snowpiercer to its core, Melanie makes a move that can’t be undone.
Melanie embarks on her most dangerous mission yet, while Layton reckons with his personal choices.
An exchange is made between the two trains, but a greater revelation might be just over the horizon.