
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.

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The truckers and their rigs are run ragged as they race to haul their last loads; Lisa accepts a load of high explosives; Jack spins out for the first time during the season; Ron's truck springs an oil leak.
As the final 72 hours of the season tick away, George Spears calls it a career; Lisa Kelly makes a harrowing 300-mile run with no brakes; the rivalry between two drivers comes down to the final load; polar bears block the road.
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.