Air date: 2015-06-18

Runtime: 42 min

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

Air date: 2015-06-25

Runtime: 42 min

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

Air date: 2015-07-02

Runtime: 42 min

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.

Air date: 2015-07-09

Runtime: 42 min

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.

Air date: 2015-07-16

Runtime: 42 min

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

Air date: 2015-07-23

Runtime: 42 min

Morgan walks into a death trap in the Alaska Range when a whiteout hits in an avalanche zone.

Air date: 2015-07-30

Runtime: 42 min

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

Air date: 2015-08-06

Runtime: 42 min

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

Air date: 2015-08-13

Runtime: 42 min

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.

Air date: 2015-08-20

Runtime: 42 min

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.

Air date: 2015-08-27

Runtime: 42 min

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

Air date: 2015-09-03

Runtime: 42 min

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

Air date: 2015-09-10

Runtime: 42 min

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

Air date: 2015-09-17

Runtime: 42 min

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

Air date: 2015-09-24

Runtime: 42 min

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

Air date: 2015-10-01

Runtime: 42 min

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