In the season premiere, a young generation ventures to the Bering Sea forging unlikely wheelhouse alliances across the fleet. But as high prices draw illegal foreign boats, captains young and old must band together to defend America's prized crab grounds.

Sig gets tough news at sea forcing the Hansens to make a critical decision as John and Andy lend a hand. With wheelhouse ambitions, Jacob hits a wall with Keith on the Wizard. New captain Jack crosses a line when Harley makes a deal with Jake.

Sig buries his beloved mother and the last of his family's pioneering generation. Sean Dwyer joins forces with Rick Shelford but the two captains don't see eye to eye on rules. Jacob fights back on the Wizard and finds no safe harbor from Captain Keith.

A new deckhand falls ill on the Time Bandit, raising questions for Andy and warning signs for John. A bait pallet breaks loose, forcing Captain Rick to deal with a severe crew injury. When Wild Bill's plan A fails on the Summer Bay, Maria tries plan P.

Sig returns from his mother's funeral only to find his gear in harm's way. Rick and Keith forge a beneficial partnership. Jack makes his first offload as captain. The Coast Guard gets a call to extract a sailor with broken legs 200 miles out to sea.

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

On the Saga, Sean Dwyer joins Jake for a high-risk trek west to Adak Island. Rick attempts a dangerous shortcut through the treacherous tides of Unimak Pass. Sig’s deckhand Lauritz takes a brutal fall while Johnathan bids farewell to a lifelong friend.

As a storm of continental proportions batters the fleet, John and Andy battle to save their anchor and the boat. Rick navigates stormy seas and feuding deckhands. An orca befriends the Northwestern; Sig and Mandy see a sign of life until it stops them from fishing.

With a storm threatening his record-breaking run, Johnathan allies with Keith to triangulate the crab. Jack braves treacherous tidal currents, staking his redemption on loaded pots. In 30-foot waves, chaos strikes the Wizard when its stack breaks loose.

An early closure forces captains to work together to get their catch safely to port. Sig crosses a line when he repositions a rookie captain's pots. Jake and Sean race back from Adak while Linda bolsters her east coast reputation in the Bering Sea.

In the winter premiere, Johnathan hunts for crab in a secret location to which he's won exclusive rights. Sig tries his luck at a derby fishery. Keith risks an at-sea deckhand transfer, and Bob joins a fisherman's strike for higher crab prices.

Captain Keith eagerly repositions his pots when Johnathan makes an offer he simply can't refuse. Bob follows a pod of porpoises to her first big solo haul. Fired from the Wizard, Jacob chases his dream of becoming a captain to a wholly different boat.

Bob's breakout haul as a solo captain takes a turn when another vessel collides with the boat she inherited from her late parents. Cascading engine failures put Sig in a tough spot as the Coast Guard makes a surprise inspection.

With $1 million in crab at stake, the Wizard battles unrelenting 30-footers. Jake faces a devil's bargain to aid another captain, but the high road may come at a cost. Sig fights to eke out a profit from the derby. The Kodiak crew assesses the damage.

Winter unleashes its fury, slamming the fleet with tidal surges and storm-driven waves. When Keith's winch seizes, the Wizard crew must work a double shift to retrieve their pots. Wild Bill's erroneous chart leaves the Summer Bay beached on a sandbar.

When a deckhand suffers a possible heart attack on board, Keith goes into emergency mode, attempting to save his crewman's life. An explosion rocks the Time Bandit, burning Freddy and shaking Johnathan to his core. Facing capsizing, Jake must dump pots.

When Sig loses GPS navigation in crowded waters, Mandy must work a decades-old magnetic compass with no margin for error. OJ’s replacement on the Wizard makes a misfit crew a bit more awkward. Bob’s Bairdi haul earns her bragging rights and breakdowns.

On the Time Bandit, crew conflict in winter weather puts Johnathan's leadership to the test. Sig and Mandy risk a heavy fine chasing the biomass along a boundary line. Jake struggles with managing an injury-prone crew member hellbent on earning his share.

As a monumental king tide amplifies the sea state, Johnathan drives the Time Bandit into towering waves to haul the riskiest set of his career. Jake faces a potentially unstoppable magnesium fire, while Sig deploys evasive maneuvers to defend his catch.

Hampered by damage, Sig must outmaneuver an unknown captain to hold onto his ground. Jake allies with Wild Bill to make a critical deadline -- but when Bill calls in his own favor, time runs short. Rick devises a strategy to ensure Jacob makes it home.

Johnathan scrambles to save his pots from a Bering Sea grave. Sig revives a decades-old fishing computer to find a Bairdi hotspot, while Jake's manpower shortage forces him to put his niece on the hydraulics.

An uncharacteristic error traps Sig's family in unsurvivable seas. A wayward crane breaches Jake's wheelhouse, killing critical systems and his way home. Rick attempts to turn a heart-wrenching tragedy into a triumph for Jacob.