M1, T3: Marty, Eustace and Tom battle the elements, predators, and time, in their struggle to make it through winter. When night falls and temperatures drop far below zero in Alaska, Marty's snowmobile breaks down, leaving him stranded. As he attempts to make the dangerous journey back to his cabin on snowshoes, Marty's body temperature drops and hypothermia sets in. North, in the Yaak Valley of Montana, Tom Oar needs to feed his family and looks to his dog Ellie for help. But when Tom and Ellie go missing, Tom's wife Nancy knows his time may have just run out. Meanwhile, in North Carolina, Eustace Conway is facing threats of his own. A dispute over his land and a low supply of winter meat leaves Eustace fighting to survive on Turtle Island. After employing the help of troublesome worker Justin, in hopes of a successful hunt, Eustace must make a difficult decision for the greater good of Turtle Island. There's no calm before the storm when you're facing winter as a Mountain Man.