King Crab's return ignites a derby-style race. After losing the Saga, Jake joins Sig as co-captain. A serious hip injury tests Sophia. A fire on the Wizard traps Keith's deckhand below deck. Wild Bill faces his hardest test yet.

As competition heats up on the King Crab grounds, Jake's next move puts him at odds with Capt. Sig. Wild Bill battles heavy seas and side effects, while Sophia "Bob" Nielsen attempts to pop in a deckhand's dislocated hip to avoid a steam back to town.

After leaving Sig's boat, Jake has a lot to prove on the massive Titan Explorer. Sig and Johnathan jockey to get ahead of a migrating king crab hoard in an underwater canyon. Rick faces Keith's wrath when his captain-in-training launches a rogue set.

A below-deck brawl puts Sophia "Bob" Nielsen's captaincy to the test on the Seabrooke. A hydro leak on the Summer Bay threatens to send Wild Bill's King Crab season into the red. Rick must make a crucial decision when Jacob's deckmate crosses the line.

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 aballoon-shy deckhand. Sophia contends with a crewman with a badly infected tooth.

On the Northwestern, Captain Sig contends with a man overboard for the first time in his career. Johnathan comes up short on crab but sees the tide turning when thousands of porpoises guide the Time Bandit in a new direction. Jack tangles with Wild Bill.

As the first Siberian storm slams the grounds, Sig sets into 40-knot winds, risking capsizing when his tank floods. Sophia must prove she can drive a boat and lead her crew in severe weather while Jake battles insubordination from his own new crew.

Sig deploys tactics from the old country to zero in on the Bairdi crab motherlode. Jack earns a windfall of new quota, but it comes at the cost of drug testing his crew. Jake gets burned by his own generosity when the Aleutian Lady overstays its welcome.

Johnathan alters time in an attempt to get to port for an anniversary he promised Heather on land. Rick battles a Bering Sea gale that knocks his deckhand out of commission while Sophia helms the Seabrooke in the roughest weather she's ever seen.

With the clock ticking on the fall season, Sig devises a clever way to simultaneously silence his crew and fish faster. As Wild Bill goes under the knife, he elevates Landon to captain the Summer Bay. After giving Jack fishing intel, Keith smells a rat.

Mother Nature blows back as the four remaining captains battle to tank their fall quotas. Landon prays for deliverance on his first solo mission, while Sig persists in fishing in 20-foot seas. Ferocious tides risk washing a Time Bandit crewman overboard.

In the winter season premiere, Sig and Keith risk fishing far from land despite a forecast Super El Niño season and encounter a gauntlet of Bering Sea weather. After sand fleas consume his bait, Johnathan strategically sets pots near a submarine volcano.

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.

Aboard the Wizard, Keith must retrieve his lost anchor in 50-knot winds. Sig attempts a risky new strategy before finding himself racing to secure the next offload slot. Rick starts to turn his season around, only to lose a greenhorn to a gruesome injury.

Sig gets blown off course when an Arctic storm strikes the Northwestern on its opening set of Golden King. Jake faces the devastating loss of his longtime engineer. Monte takes the wheel of the Wizard when Keith inexplicably collapses in the wheelhouse.

After Keith suffers a cardiac event at sea, Monte races to get his brother to the nearest airstrip for medivac. As the fleet prays for Keith's safety, the Wizard crew must navigate the notoriously dangerous port entry at Saint Paul in perilous conditions.

As Keith fights for his life at Anchorage General, Sig helps his brother Monte to get back on the crab. Aboard the Titan Explorer, Jake's deckhand is knocked out by 900 pounds of swinging steel. Rick's new engineer crosses a line he can't come back from.

John risks capsizing after being forced to fish with a slack tank. Jake hauls in the largest seas of his career. Under pressure to get home for the arrival of Mandy's second child, Sig and Clark fish deeper than ever before as mechanical problems mount.

Four boats race to beat closing canneries as conditions intensify on the water. Sig suffers a major outage with hours to port; Jake uses his only gear to back out of trouble, and John doubles down on sea mammals, this time, orcas.