The balance of power is turned upside down. Darrell tries to turn his upstart company into a force by poaching an ice road legend from Polar, sparking an all-out war on the frozen frontier.
Art crosses one of the longest winter roads in the world; Todd must dig himself out from snow; Darrell takes a load over a newly-opened road littered with abandoned trucks.
Todd tries to deliver the heaviest haul in Polar history; Art’s on a high-stakes mission; Lisa lands a contract; Darrell steals a load from Polar, leading to a clash with Mark.
Mark brings in Mike who has a rocky trip with Art; Todd and Darrell hit a newly opened trail; Alex gets relies on instinct to find his way; Lisa faces a trucker nightmare on a dangerous crossing.
New owners Darrell and Lisa get a jolt from a high-stakes mission; Todd runs into trouble with a government contact; Art’s season is headed for the gutter; Mike tries his first solo trip.
Darrell and Lisa could lose everything when Darrell’s truck breaks down; Todd tries to recover lost freight; Rookie Mike’s inexperience costs him; Art fights for his life on the ice.
Art struggles to keep his rig above ground; Alex fight up a mud-covered mountain; Lisa and Darrell travel a trail at ground zero of the thaw, where getting stuck could doom their company.
During an early thaw, Darrell and Lisa struggle to make it home over a hard trail; Art and the King of Obsolete reunite; Alex races against the clock to deliver; Todd conquers a melted ice crossing.
The two rivals join forces to take on the biggest challenge in IRT history—pulling a cat train across the Hudson Bay. But it becomes a desperate fight for survival.