In the Season 4 premiere, unpredictable extreme conditions lead to the survivalists finding new ways to adapt.

Tom defends his home against the threat of a bear; Morgan makes a fatal miscalculation on thin ice.

Morgan gets stuck in the grips of an ice desert with no shelter in sight; Marty's return to Alaska's Revelation Mountains takes an unexpected turn.

Winter's uneven arrival creates mayhem in the mountains, placing Rich on the front lines of a new war against predators and pushing Tom to the brink.

Morgan climbs into the dangerous Alaska Range; Rich goes to war with the wolves.

Marty finds an unexpected advantage; Rich starts a search for a lost friend.

Morgan stakes out his next meal to battle starvation; Marty finds an unexpected jackpot.

Tom's run of bad luck escalates, but he refuses to give up; Morgan closes in on his goal; Marty prepares for his family's arrival on the line.

Morgan's survival depends on a critical airdrop; gale-force winds threaten to destroy Marty's cabin; Tom finally gets a breakthrough that could end his losing streak.

Eustace Conway and others try to obtain the food and supplies to make it through winter.

A breakdown leaves Marty stranded after dark; Eustace must improvise when he comes up shorthanded.

An early melt halts Marty's record run; Tom receives a surprise boost; and Eustace tries to finish a logging job before spring.

Marty makes a gamble that changes everything; a storm batters Eustace and Preston during their final push.

A predator comes back when Tom can least afford it; Marty runs out of daylight; Rich fights back the wolves.

It's a race against the end of winter, Marty takes a risk on thin ice, and Rich launches a rescue mission.