"Snowpiercer" is a science fiction film directed by Bong Joon-ho, set in a post-apocalyptic world where a failed climate-change experiment has frozen the Earth. The last remnants of humanity live on a massive train called the Snowpiercer, which travels endlessly around the globe. The train is divided by class, with the wealthy in luxurious front cars and the poor in cramped, squalid conditions at the back. The story follows Curtis, a member of the lower class, as he leads a rebellion to reach the front of the train. Along the way, he confronts the train's enigmatic creator, Wilford, and uncovers dark secrets about the train's operation and the survival of humanity. The film explores themes of class struggle, survival, and the consequences of human actions.