After a monster ice age puts the entire world under a frozen ice spell, a group of survivors seek comfort and shelter on the Snowpiercer, a luxury train whose carriages confine and organise passengers based on class. As time slowly passes with little to no improvement, the train's poorest travellers devise a plan to take control of the engine room on New Year's, while the wealthier passengers are distracted with their extravagant celebrations. Under the leadership of their new lower-class captain, Curtis (Chris Evans), they set forth. But in order to reach the front of the train, they'll have to make their way through every carriage and its increasingly wealthy guests.