Snowpiercer

The Host and Mother director Bong Joon-ho makes his English-language debut with this dystopian sci-fi thriller set in the aftermath of a failed global-warming experiment that ushered in the dawn of a new Ice Age. As a perpetual-motion engine keeps a super-powered locomotive speeding around the planet, the impoverished lower classes occupy the rear cars while the privileged upper classes are pampered in the front. The fragile balance of power between the two begins to shift, however, when an enig…