
Truckers with nerves of steel take their lives in their hands driving heavily loaded vehicles across frozen lakes to deliver supplies to remote locations in Canada and Alaska. Whether they're bringing supplies to Canadian diamond mines, supplying offshore oil rigs in Alaska or even charting new territory driving over frozen swamps and rivers to bring much-needed supplies to small towns, these extreme truckers face troubles from their machines and from Mother Nature.

Alex faces the biggest blizzard of the season; Darrell Ward raises the stakes in his rivalry with Jack Jessee; Porkchop struggles to climb Atigun Pass; Austin is sent out on a heavy haul special assignment.

Rick crashes into a superintendent of the road; Austin is given the toughest challenge of his Dalton career; Porkchop is sent to help Jack get a job done; Darrell Ward fights to stay warm when his truck dies.

The season opens and quickly claims its first victim with a wreck; a trucker breaks through to the isolated town of Bettles; Jack returns to defend his title; Greg wants to take him down and has something to prove.

Failing trailer brakes and trash talk over the CB threaten to derail Lisa's comeback; newcomer Greg races to reignite his rivalry with Jack, before a wreck slams the brakes on Greg's need for speed.