As the final 72 hours of the Ice Road season tick away, legendary driver George Spears calls it a career, Lisa Kelly makes a harrowing 300-mile run with no brakes, the rivalry between Alex Debogorski and Hugh “The Polar Bear” Rowland comes down to the final load, and polar bears–real ones–shut down the Ice Road in front of Jack Jessee, as the “Dash for the Cash” comes down to the wire.