When the government closes the king crab fishery, captains must save an industry they worked to create. Plus, Sig pursues invasive Russian king crab in Norway.

Captain Sig suddenly loses power as he battles to launch his new Norwegian fishing operation. Plus, Captain Rip Carlton races to save an injured deckhand.

A deckhand who thinks he knows more than Captain Sig fights for his life tangled in a potline. Wild Bill struggles to save his vessel from impacting the jagged fjords.

In the extreme north of Norway, Sig risks dropping pots on the Russian line. As water floods the Saga's engine room, Jake scrambles to save his boat and his niece. Josh and Casey call in an undeserved favor from Johnathan as canneries close their doors.

Sig scrambles to get home for Bairdi and Mandy's baby as his crew finds a honey hole of Russian King Crab. Josh's brother Shane gets caught in the bight as a typhoon slams the Cornelia Marie. Rip faces a crisis when a greenhorn collapses unconscious.

Johnathan searches for a pot of Golden Kings at the end of a double rainbow. A medical mystery confounds Captain Rip when his greenhorn regains consciousness on the Patricia Lee. Keith partners with Josh and Casey until John steps in.

Johnathan pulls an unknown species with mile-deep commercial crab pots. Jake's niece gets injured on the Saga and Clark takes the helm in Sig's wheelhouse.

Mandy's pregnancy complication forces Sig and Clark to reconsider their stand. Jake and Rip team up in deep waters to battle powerful Aleutian tidal currents.

Jake hits pay dirt taking his niece to an ancestor's fishing grounds, but after a crewman leaves a hatch open, their prized black cod escape by the hundreds. When the Time Bandit ventures into freshwater, Johnathan risks killing his entire live catch.

With dock prices spiking, the fleet races to deliver. Jake witnesses a freighter severing his longline, forcing the Saga crew to drag the bottom for a valuable string of pots. Rip helps Johnathan locate the motherlode only to pay with a broken block.

In an epic Fall season finale, Clark scuttles Sig's partnership with Harley to get home for the birth of his and Mandy's baby. An orca leads the Cornelia Marie to the season's best pots. When John's autopilot fails, Jake is the star that leads him home.

In the Winter premiere, nautical weather slams the fleet as Josh and Casey race north in hopes of beating the coming ice pack. Sig and Keith attempt to find common ground, and on the Time Bandit, Johnathan finds his co-captain a bit wobbly. 300th episode.

The Northwestern has a risky encounter with a bald eagle. Josh and Casey place a bet on a hard-to-find quota, while casualties mount on the Patty.

New-mother Mandy returns to Sig's wheelhouse, but as heavy ice builds on the Northwestern, she reckons with the risks the family is taking; Jake unveils a new super pot to stake his claim in the cod derby as winter weather blindsides the fleet.

Sig is forced to jettison pots lest he capsizes the Northwestern; Jake and the Saga hit bottom; Sean Dwyer devises creative motivation for his greenhorns.

Keith recruits Johnathan to intercept a Russian trawler fishing illegally in US waters but the situation intensifies when the Time Bandit crew spots a missile streaking across their position. Bill and Sean fight to defend their pots from rogue trawlers.

Josh and Casey race to the approaching ice edge as an Aleutian storm slams the opilio grounds. Jake discovers his niece and engineer have been hooking up more than crab gear as they risk life and limb climbing the 30ft crane to make a critical repair.

The Cornelia Marie crashes into the ice pack when the greenhorn on watch falls asleep at the wheel; Jake's crew experiences a stunning phenomenon when a flock of seabirds bombards the Saga; Wild Bill tackles an unsafe sea state on the Summer Bay.

After risking his crew salvaging gear from the ice pack, Sig changes tactics deploying an experimental bait from Norway. On the Time Bandit, frustration boils over as Freddy tests Johnathan. Jake hauls in seas so volatile his crew must take shelter.

With intense currents holding back the Arctic ice pack, Keith drives into deck-wrecking waves to retrieve his catch before the ice bounces back. Jake and Sean face losing everything when ice swallows their gear as Rip enters a pot cemetery of his own.

The icy depths of the Bering Sea threaten to claim Sig and Wild Bill's gear unless they can move quickly enough to beat the rapidly freezing waters; Rip take on a massive amount of extra quota, and if he can't catch it, he'll have to buy it.

As ice blocks St. Paul Harbor, captains race to deliver their final snow crab. Sig deploys a risky tactic his father pioneered, while Jake battles a slack tank to save the Saga. Keith and John scuttle a plan as the Wizard's 77-year-old hull cracks open.