In the Revelation Mountains of Alaska, Marty faces off with a vicious wolverine. In Montana, Rich tries to protect a young family from a hungry predator while Tom Oar battles the bitter cold to build a primitive teepee. And in Maine, one wrong step has Charlie Tucker fighting for his life.

Marty is stranded in the Revelation Mountains with one last chance to get home, while Kyle and Ben launch a nighttime stakeout to stop a predator.

Winter has finally come to a close, spelling big changes for Tom, who bids farewell to an old friend and packs his bags for Florida. In the Ruby Valley, Rich grooms his youngest hound to take over the pack, but an influx of cougars finds the pup in over his head. In North Carolina, Eustace takes a dangerous trip down a rapid river to deliver the canoe he built to pay off his loan. In Maine, Charlie takes his furs to market and hopes to break even on his rookie season, while in Alaska, Marty enjoys a reunion with his family, then makes big plans for the future.

Marty is forced to make a mid-flight detour that costs him precious fuel; Rich faces his worst fear when the dogs run off in pursuit of a deadly predator, and Kyle takes down a beast.

Marty rushes to make the most of an extra pair of hands. Tom's grandson comes for a visit but soon learns that there's no such thing as vacation in the Yaak. Charlie heads out on a hunt for shed moose antlers. And in Montana's Ruby Valley, Rich Lewis' dogs are hot on the scent of a mountain lion when their hunt takes a dangerous turn.

As the bitter cold pushes predators to the edge, Tom is caught in a close range battle while Rich goes head to head with a pack of wolves.

A visit from Tom's son Chad goes terribly wrong and Marty's flight back from the Revelation Mountains is delayed.

Tom battles a dangerous ice jam. Marty launches a last ditch escape from the Revelations, and a deadly predator returns to the Ruby Valley.

Kidd and Harry traverse through intense whitewater to reach the spawning grounds of steelhead trout. Jake loses his dogs after they follow lion tracks into remote and unfamiliar territory. Paul checks his traps and takes home the biggest prize on the mountain. Eustace mills massive beams to repair a deteriorating dock at a local marina. Aron and Jen mill all their own lumber and rebuild a cabin roof.

In Alaska, after spending the night under the stars in subzero conditions Marty struggles to get his snow machine out of a stubborn overflow. In the Ruby Valley, Rich takes his oldest dog, Brandy and youngest dog, Hatchet, out on a special training mission. Eustace and Preston set off on a crucial deer hunt, but are interrupted by loud intruders. In the Yaak Valley, Tom is called by his friend, Tim to help with a beaver problem and takes the opportunity to teach an important lesson; and in Maine, Charlie and Jim head to the frozen river to carve out 100 pound ice chunks for Charlie's root cellar.

Tom and Sean brave the bitter cold in search of better trapping grounds; Jake seeks revenge on the lion that injured his hound; Eustace and Raleigh struggle to fix a storm-damaged bridge that connects Turtle Island to the world outside; Mary forges her first Ozark blade; and Josh loses a bison to a pack of hungry wolves.

Jason's bladesmithing business suffers a critical setback when his hand is badly cut on the job; Jake's latest lion hunt turns into a rescue mission when he discovers his dogs are on a collision course with a pack of wolves; Kidd and Harry break a colt for a backcountry client; and Josh salvages all he can from a bison that was killed by wolves.

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In the Yaak Valley, Tom Oar teams up with his brother Jack to help return Jack's prized hunting falcon back to the wild. In southern Montana, Rich Lewis and his wife Diane need to move their cattle herd, but will the predators get to them first? Marty starts wrapping up a successful season, but the elements won't let him leave Alaska without a fight. Eustace and Preston realize they have to contend with coyotes who are putting their wild game at risk. And in Maine, rookie Charlie Tucker struggles to re-start his season after an injury left him with one working arm.

In Montana, Rich Lewis must defend his home from a mountain lion that has invaded his turf. In New Mexico, after a failed first attempt, Kyle Bell's son Ben steps up again to break a wild young colt. In the Revelation Mountains, a voracious wolverine threatens to derail Marty Meierotto's season for good, and in North Carolina, Eustace Conway puts his wood burning truck to the ultimate test.

Marty fights back against a wolverine but it takes him on a treacherous journey; Charlie takes a big risk in uncharted wilderness and Tom claims his place on the food chain.

When winter unleashes its full fury Kyle and Ben get caught in its crosshairs. In Alaska, Marty's gamble on new country pays off. The polar assault brings Eustace's progress in North Carolina to a standstill. And far north in Maine, Charlie breaks the ice to finally cash in on some fur.

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

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

As winter closes in, Morgan and Margaret fly North to track down the great caribou migration and secure meat; Marty preps his trapline for the arrival of his daughter, Noah; Jake starts his season tracking two lions. Eustace takes on an apprentice and uncovers some illicit activity on his new land; Kidd and Harry rescue horses from a pack of hungry wolves.

Mike's bear scout turns into an alpine goat hunt; Jake brings in the big dogs to settle an old score with a problem lion; Tom and Sean check beaver sets to see if their new trapping grounds will pay off; Jason leans on the family to overcome a looming deadline and a broken hand; and Kidd and Harry run a backcountry gauntlet to deliver a young horse to a remote buyer.

Josh witnesses a bison give birth to the first calf of spring; Kidd and Harry load a mule into their boat and transport it downriver through raging rapids; Jake runs two mountain lions up the same tree; Eustace receives help from his neighbors as they rush to repair the roof of a damaged hay barn; Mike adds off-grid utilities to his remote hunting cabin.

Jake and the pups make a grisly discovery in new territory; Josh rebuilds an antique windmill to power his outpost cabin; Kidd and Harry brave raging rapids to retrieve a capsized canoe; Martha and Elli clear the road of fallen trees.

Eustace hunts for his winter meat in the pre-dawn hours. Jake harvests a deer with bow and arrow. Tom helps his friend Paul prepare for trapping season. Ray stalks elk through knee deep powder, and spends a frigid night on the mountain. Aron hauls his winter supplies over a treacherous off-road trail, but the final stretch of the mission proves most daunting.

Tom packs a traditional muzzleloader on a winter deer hunt with Sean and Hank; Jake and Anika complete a successful elk hunt with a backbreaking pack out; Aron and Jen cut down dead trees that threaten to destroy their cabin.