In "Snowpiercer," those who have survived through Earth's second ice age live on a luxury train that runs through Earth's icy terrain, but they're separated by class, with the poorest residents banished to the train's grubbiest carts at its tail end. Sick of their situation, the poor residents hatch a plan (led by Evans's character, Curtis) to take over the train's engine room and, in doing so, the rest of the train.