The Arctic ice pack descends on the fleet as they make their final runs. Both the crews of the Northwestern and Wizard battle freezing spray. The Cornelia Marie's crew suffers from "Bering Sea dementia" while the Time Bandit's crew is at its breaking point.

As the crab become harder to find, veterans Sig Hansen and "Harley" Davidson form an unusual alliance, however trust doesn't come easy for old school captains. Freddy pays a price for Keith's decision to haul in rough seas and Jake tempts fate to become a boat owner.

As smoke starts to fill the Wizard, Keith and Monte face a dark ship nightmare. Massive breakers shatter Jake's steel anchor forcing him to fight to avoid the rocks of St. Paul Island. Battered by relentless seas, Sig turns to his family to fill the Northwestern's tanks.

The bone-breaking winter unleashes fury on the Summer Bay. A rookie mistake leaves Captain Bill short a hand. Jake hits the jackpot at sea, but forces on land cost him dearly. There's hell to pay when Sean discovers the fatal flaw in his crab count.

Each captain’s next move determines who survives the final winter push. Winds put the Wizard on a collision course with a monster wave. Jake taps a Hillstrand to save the Saga. Josh and Casey hit numbers not seen since Josh’s father, Phil Harris, was captain of the Corneila Marie.

In the season finale, with just ten pots to go, a crushing injury requires Coast Guard rescue. Josh and Casey face a huge loss when their offload gets cancelled. Sig gambles on an early finish, while Monte hauls more crab than the Wizard can hold.

The wrath of Arctic Storm Elsa hits the Cornelia hardest as a breakaway pot thrashes Josh and Casey's crew; Capt. Keith orders deckhands onto the stack as Elsa's icy blasts threaten to capsize the Wizard; the Saga takes a rogue wave.

As arctic super-storm Elsa intensifies, a forecast warns of isolated waves of unusual size; trapped in the crab-rich northern grounds, the Cornelia Marie, Wizard and Southern Wind haul pots as big as the waves, until one boat faces a 60-foot monster.

Atop the king crab super swarm, full pots boil over into conflict as young guns Sean and Jake join forces to set down Sig. Keith and Harley reignite a decades old rivalry, and Sean faces the long arm of Alaska law when crab in his tank come up short.

In storm-driven seas, Cornelia Marie's crane goes off the rails; Sig risks navigating a rocky passage in treacherous conditions, and the Wizard crew face a rogue wave without warning.

The Bering Sea takes a toll on captains and crew. Wild Bill calls the Cornelia for help. Jake confronts a disorderly crew, forcing his toughest decision yet as captain. Josh mans the helm as Casey makes a risky ship-to-ship transfer in high seas.

As winter intensifies, Sean faces an engine room fire. Summer Bay deck boss suffers a season-threatening injury. Harley offers a newfound nephew a trial run at greenhorn. Monte races to fill Wizard's quota so Keith can say farewell to their father.

Josh and Casey risk a 500 mile trek north to the icy Russian line. Jake tracks his own fast-moving crab horde. Sig does double duty on the Northwestern. The Bering sea cracks the Wizard's steel hull as the Colburns face the loss of their dad.

Josh and Casey haul in their biggest pots ever, starting a gold rush to the Russian line. Captain Bill gets some inside intel, while Harvey confirms the numbers his own way. As Arctic Storm Elsa strengthens, the fleet realizes the ice queen casts a deadly spell.

In storm-driven seas, Cornelia Marie's crane goes off the rails, smashing Josh and Casey's wheelhouse and injuring deckhand Taylor; Sig risks navigating a rocky passage in treacherous conditions, and the Wizard crew face a rogue wave without warning.

Deckhands pay in blood as captains make up for time lost to the storm; on the Cornelia Marie, Josh takes the wheel as Casey conducts surgery at sea; Brenna A tests the mettle of a former Marine; a call from home has Sig facing a worst-case scenario.

The fleet battles a freight train of back to back storms. Sig's crew pays a price for some stuffed pots and Harley risks his gear to cash in on an elusive crab hoard under the ice. Freddy attempts to perform self surgery on the Wizard and on the Summer Bay the crew gets news on Nick's future.

Monte returns to co-captain the Wizard just as massive storms slam the fleet from the south. Jake risks hauling his pots in 30 foot seas to return to his family. Wild Bill goes farther north into the icy Arctic than any other boat in the fleet.

Hours before king season, a huge new boat with a renegade captain finds the crab are all in one spot. The fleet races to find the hoard and fight for their share.

The crews and battered boats are feeling the brunt of one of the hardest Opilio seasons on record. While some crew members battle potentially catastrophic breakdowns to stay on the grounds and keep fishing, others throw in the towel and call it quits.

The Cornelia Marie uses US satellites to spy on the Russians, Scott pioneers a dormant fishery and Wild Bill faces off with a Russian greenhorn.

As wintry weather pounds the fleet, a 30-foot wave crushes a Titan Explorer deckhand, threatening Jake's captaincy. On the Time Bandit, Johnathan loses a generator and goes dark. The Aleutian Lady drives into the weather to reach Dutch Harbor for repairs.

When Sig and Mandy disagree on a fishing strategy, Clark is caught in the middle. Wild Bill comes down hard on deckhands as Linda gets too close to danger. Keith pulls the Wizard alongside the Saga and unleashes unexpected bad blood.

Captains scramble to meet an expanded quota in the path of a violent system dubbed "Squall-pocalypse". A breakdown on the Wizard puts Monte in debt to the Time Bandit and Josh and Casey exceed their own quota when it comes to injuries on deck.

When Sig's fishing information falls into the wrong hands, he deals his protégé a lesson he won't soon forget. After his crew gets slammed by back-to-back waves, Rick faces a gun-shy deckhand. Sophia contends with a crewman with a badly infected tooth.