TNT | 9:00 pm

The critically praised futuristic action thriller wraps up its first season with two final back-to-back episodes. First, in "The Train Demanded Blood," a dangerous foe defects to the side of the rebel forces, who hatch a scheme to seize control of Snowpiercer once and for all, even though it comes at a grave moral cost. Then, in the finale "994 Cars Long," Layton (Daveed Diggs) struggles to govern the traumatized survivors, while Melanie (Jennifer Connelly) finally makes temporary peace with her demons.