A boy experiences doubt in Santa after his younger sister brings it up, and he falls asleep on Christmas Eve with this question in mind. His thoughts materialize in a dream led by the conductor of the Polar Express train who resembles his father. Both his mind and the events of the Polar bound train travel the ups and downs twists and turns of the idea of what is necessary for belief. We witness the child of strength and the child of noncommittal, along with joys and distraction of his Christmas Eve dream. What present do you take with you?