A dramatic change in the Russian crab industry rocks global markets and drives new competition between Dutch Harbor captains and their Russian adversaries. As crab prices skyrocket legendary captains return to claim their piece of a historic payday.

Just as the fleet begins its race to beat the Russians, ferocious typhoon Hagibis turns its deadly gaze on the Bering Sea. Captains must choose whether to risk life and limb for a big payday, or to sit out the storm and fish another day.

Still reeling from deadly typhoon Hagibis, the fleet claws its way back into competition against the Russians. The pressure to make up ground has mounted and it's do-or-die for the captains, even if it means danger or even war.

With the Russian menace looming, co-captains Johnathan and Jake blast a shotgun at their problems while a vicious fist fight breaks out on the Seabrooke. Meanwhile, Wild Bill blows an engine and Mandy bets on science to get back on crabs.

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.

Johnathan finds himself going under the knife at sea as King season comes to an end. Junior chases the elusive Golden King and Wild Bill faces off with a greenhorn.

Junior risks crossing into Russian waters to tank golden crab. Co-captains Jake and Johnathan attempt an alliance with longtime rival Keith Colburn. Josh Harris bets his season on instinct. Short on quota and options, Wild Bill seeks work in Russia.

The Coast Guard responds to a mayday call as captains and crew brace for the loss of friends during a brutal winter storm. Sig and Monte track an opilio hoard at the Russian line, and the clock is ticking for Wild Bill & Junior during the cod derby.

As the crab biomass migrates across the Russian line, Josh and Casey dump 175 pots on the border. Sig and Mandy go dark ship in towering seas. Jake's new deckhand gets injured while Junior attempts to steam through False Pass in a nighttime blizzard.

Facing a 500-mile wide Siberian storm, Josh takes a big risk to keep the Cornelia Marie crew safe. Junior loses control of his rudders putting his boat at the mercy of heavy seas. Jake’s greenhorn problems get a lot worse when one clogs the toilet.

Listing heavily and taking on water, Junior calls on chase boat rescue for the first time in series history. Wild Bill sends Nick 20 feet off the deck in spite of his fear of heights. Josh and Casey hit a massive wave that knocks out greenhorn Maria.

On the Summer Bay there's hell to pay when Bill's backup block goes missing. Cornelia Marie skippers Josh and Casey navigate a tenuous partnership at the Russian line. Weighed down by three full tanks, Sig puts a heavy Northwestern in Mandy's hands.

The Wizard catches fire in a violent storm known as a bomb cyclone. Josh and Casey attempt to fish in 30-foot seas, while two rogue waves slam the Southern Wind. Wild Bill grinds his crew 72 straight hours bringing himself to the brink of collapse.

Battling exhaustion, Wild Bill and his crew face the full wrath of the bomb cyclone. A snapped tendon puts the Summer Bay down a man. Josh gambles on crab-rich grounds in a costly venture north. An injured Mac fights to get Junior through the storm.

As an injury knocks Sig out of his wheelhouse, Mandy takes the helm to face a disgruntled Northwestern crew.

Stuffed pots come at a price as Jake scrambles to repair a slack tank before it kills his crab or capsizes the Saga.

Josh and Casey race to haul pots as engine failure threatens their delivery window. As seawater destroys his hydraulic motors, Junior attempts a risky high seas delivery of three new motors. Harley and his crew bang heads over his fishing strategy.

Sig and Mandy conspire to get Jake to do their prospecting, but the former deckhand seizes the moment to fill his own tanks. The Wizard crew must break through ice to rush Keith to a doctor. Junior fears the worst as a deckhand falls from the stack.

A rare weather event churns up rogue waves as supermoon tides collide with a cyclonic snowstorm. Josh and Casey face a 55-foot monster, while Jake risks capsizing to repair his rudder in unruly seas. Monte's big move north pays off in massive pots.

As the super snow-moon storm peaks, the Cornelia Marie's deck becomes a gauntlet for Josh and Casey's greenest greenhorn. Ice fog overtakes the fleet as Monte scrambles to stay afloat, Harley loses an engine and Junior fights a sea-flea infestation.

As the fleet mounts a final Winter season push, sad news rattles the Cornelia Marie wheelhouse. Lady Alaska greenhorn, Gabby, overcomes a painful injury to support her crew. Wild Bill's deckhands must devise a bush fix or face hauling pots by hand.

Saga loses a veteran deckhand, forcing Jake to steam a greenhorn army to the Russian line. Amid scuttlebutt that ports are closing due to a virus, Josh fights to get home for a reunion with his brother and Sig's daughter gets rushed to the hospital.

The Cornelia crew fights to save its gear from sea ice; Jake risks the far north to fill his tanks before his son's birth; amid news of a looming pandemic, Russian boats mysteriously disappear and captains race to dock before crab prices crash.

With half the crab boats tied up, Sig devises a plan to save the fishery from destruction. As Bering Sea legend Johnathan Hillstrand returns with the Time Bandit to help, veterans struggle to prove they can work together to defend the American dream.

When Mandy devises a plan for partnering, Sig must rethink his own hard-won tactics. On the Time Bandit, John and Josh conspire to outmaneuver a Russian captain who tells them what to do in US waters. All hell breaks loose as two vessels collide.

As hundreds of dolphins lead the Summer Bay into an approaching cyclone, Jake attempts a daring nighttime rescue in high seas. Scott Campbell Jr. finds himself out of options, leaving Sig to make a controversial call to save the fishery.

Driving the Time Bandit and Cornelia Marie, Josh and Casey attempt Johnathan's strategy for tracking King Crab across time and space. On the Summer Bay, Wild Bill's crew fights a mid-gale power outage, but the days are numbered for their greenhorn.

As a typhoon rocks the Bering Sea, the Summer Bay suffers a collision. Sig gambles all his pots in one spot, while Casey takes a scientific approach to finding the elusive Bairdi crab. John and Josh rush a pit stop to get the Time Bandit back in the hunt.

Time Bandit and Northwestern are struggling so they decide to join forces and throw cages down on either side of the restricted zone. Will their new technique work out?

With the Bairdi fishery open for the first time in years, Josh and John on the Time Bandit reopen the Phil Harris playbook and ask Casey and Sig to help tank the fleetwide quota. Wild Bill bets on Nick McGlashan to turn the tide for the Summer Bay.

Time Bandit and Cornelia Marie race for the last spot at the cannery, but as word spreads of an emergency shutdown of the Bairdi fishery, they return to the grounds as Sig Hansen rallies his fellow captains with an unconventional plan.

In the Winter premiere, the fleet reels from the loss of Summer Bay deck boss Nick McGlashan. Wizard and Cornelia launch early into a massive Arctic storm. Johnathan can't see eye-to-eye with an old friend and shocking news forces Sig to change his plans.

When Johnathan trusts his instincts more than his partners, the Time Bandit makes a surprise appearance in the Northern Grounds just as Josh and Casey need him most. Sig puts his crew exactly where they need to be in a matter of life and death.

As seawater floods in, Wild Bill's crew scrambles to locate a hole in the Summer Bay's hull. Johnathan faces a fire on the Time Bandit and a catastrophic hydraulic failure forces Jake to send his chief engineer 25 feet above the Saga's rolling deck.

As a polar vortex storm slams the Cornelia Marie in the far north, Josh navigates the biggest seas of his career while Casey performs emergency surgery. A catastrophic collapse of the Northwestern's crane leaves Sig and Mandy with no way to haul pots.

Sig makes a desperate bid to save his gear from the descending ice pack while Jake dumps pots to avoid capsize. When Wild Bill gets a line caught in his propeller far from Dutch Harbor, he enlists Jake's diver to attempt a risky underwater repair.

As the fast-moving ice edge crushes all in its path, Sig and Mandy rush north to rejoin the fray. On the Cornelia Marie, Josh and Casey's race to save their pots comes at a cost in blood and pain. Heavy freezing spray threatens to capsize the Wizard.

Skirting the ice line to the deepest set of their careers, Josh and Casey apply frontier medicine to a bleeding deck boss. A block wound sidelines Wild Bill's new rail man, while injuries on the Time Bandit take out two crewmen and threaten family bonds.

As canneries unexpectedly change delivery rules, captains must race to get to the front of the line. Jake risks a daring entry into St. Paul harbor, as Johnathan seeks help from Wild Bill. Josh and Casey bet their season on a deep set at the Russian Line.

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.

An Arctic storm blasts the fleet as Sig ventures to deep waters he hasn't fished in 17 years. Johnathan steers the Time Bandit into 30-foot waves in a hail Mary run toward Russia. Captain Keith attempts a risky maneuver to save the Wizard's pots.

Cornelia Marie skippers Josh and Casey follow a blind tip from an unknown fisherman into uncharted waters. Johnathan fears for the worst when Freddy lands in the icy Bering Sea. On the Wizard, Captain Keith tempts fate, risking thousands in crab gear right at the ice edge.

Jake battles a hurricane in the fleet's smallest boat while Keith orders crew over the rail to avoid capsizing. When Johnathan discovers crab in his cod pots, his crew scrambles to locate the hoard as "Blind Dog" finds himself in a bone-crushing position.

When processors shut down due to outbreaks, Sig bets he can zero in on a rare "crab highway" before there's no place to deliver. Josh and Casey race to deliver live crab after their pump fails, while Harley risks shipwreck to be first to enter St. Paul.

In the season finale, Keith risks pushing through jagged ice in search of the Wizard's lost pots. Attempting a risky harbor entry, Wild Bill overturns the Summer Bay and a beloved crewman makes the ultimate sacrifice on the deck of a veteran crab boat.