As winter approaches, Morgan battles a bear-infested island for a critical head start on the season; Tom is caught in Montana's deadly wildfires; Eustace wrestles with the aftermath of Preston's death.

The bears keep Morgan on the run as he tries to secure his catch; Eustace struggles to get back to work without Preston; Tom scales treacherous terrain and Jake readies his team to face down the lions.

Marty fights to reclaim his long-abandoned turf; Morgan races to build a shelter in the snow of subzero Alaska; Jason and Mary brace for a home birth; and Jake's lion hunt takes a dangerous detour.

Morgan learns to fly in the extreme winter; Marty battles a predator invasion; Tom faces a new wolf threat; Jake and his hounds hunt a rogue lion; and Jason steps in to bring a new life into the world.

Tom takes the fight to the wolves; a lion chase claims a casualty; Morgan builds bigger; and Eustace goes to battle to defend his land.

Marty brings in a record haul; Margaret's extreme flight training leaves her out in the cold; Tom puts his master craftsmen skills to work; and Jake chases his next meal.

Tom goes on a rescue mission; The deep freeze leaves Morgan and Margaret scrambling for water; Eustace bids on his neighbor's land; and Jason's improvised engineering is a game-changer in the forge.

Tom returns to the field on a rescue mission; The deep freeze leaves Morgan and Margaret scrambling for water; Eustace takes on a risky payday in a bid to buy his neighbor's land.

Morgan's first flight over the peaks leaves him in a dead skid over the edge; Marty fights to double down on a big payday; Jason takes River on a mountain rite of passage.

A mid-winter melt threatens to derail Tom's season; Eustace masters gravity to keep the water flowing at home; Jason and Mary make a move to feed their growing family.

Marty brings out the big guns for a final frenzied push out of the brush; Morgan and Margaret make a major breakthrough; Mike battles Kodiak's most treacherous mountain; Jake faces down a pair of predators; and Jason fuels the forge.

A massive week-long storm tears Morgan's homestead apart; Mike goes on the offensive for the annual awakening of Kodiak's bears.

When a massive mid-winter storm tears across Alaska, Marty pushes his machine to the limit while Morgan and Margaret race to make the cut before the snow hits.

Morgan's big day goes bust when his plane breaks down; Mike's supply run across the bay leaves him high and dry; Tom takes on a rare high value commission; and Jake's dog team hunts down two lions in a marathon high-speed chase.

Morgan's first flight to the homestead hits a wall of bad weather; Tom runs a gauntlet of timber and brush in search of some fur; Eustace revives his furniture business; and Jason forges salvaged airplane parts into high-end cutlery.

Marty wraps up trapping season with a record haul of fur; Morgan flies solo for the first time over the towering peaks of the Great Alaska Range.