Snowpiercer’s two-part finale can't shake the character problems it’s picked up along the way

In the first half of its two-part season finale, Snowpiercer barrels toward an inevitable team-up: Layton and Melanie. Here, the show benefits from its intentional obscuring of Melanie’s motivations over the course of the series. She gets to become the anti-hero that the show has positioned her as. For all of the…