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.

As an injury knocks Sig out of his wheelhouse, Mandy takes the helm to face a disgruntled Northwestern crew; on the Wizard, damaged hydraulics and an umbilical hernia deal Keith a double gut punch; Josh and Casey suffer tragedy on the Cornelia Marie.

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.

A big decision weighs on Sig Hansen; rookie captain Sean Dwyer gambles on a new venture with a new crew; Jake Anderson struggles to replace a lost anchor before his quota is taken away.

A massive leak fills the Time Bandit; a fistfight tests Jake's resolve while heavy winds and a snapped anchor threaten to wreck his boat; Sig's greenhorn has an awkward question.

Johnathan and Andy Hillstrand fish together for the last time; Keith's inattentive crew sends the Wizard on a collision course; a belligerent deckhand tests Jake's resolve as captain.

Wild Bill uncovers the truth about Nick McGlashan's terminal illness; a damaging mechanical issue threatens to crush Jake's future; warming seas force Keith into the unknown.

Rising sea temperatures test the fleet; toxic smoke engulfs the Saga; Sean struggles to save the family business on the Brenna A; Wild Bill fears he could lose Nick to a terminal illness.

The fall season begins with uncertainty; a seismic shift in sea temperature sends the fleet searching for displaced crab, while also fighting a large first storm.

The fleet struggles as crabs vanish; Capt. Sig resumes the helm after a major heart attack; Wild Bill debuts his own brand new boat in a crisis season; attempting to rescue a heart attack victim.

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's rudder fails in heavy traffic and Wild Bill's new greenhorn makes an easy target for an out-of-control picking hook.

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

A rogue wave forces Zack to make a life-or-death decision; Josh bets on a Bering Sea myth against his co-captain and crew; giant seas roll Sean Dwyer; Sig turns to daughter Mandy for help.

Shedding blood on the Time Bandit; a fight breaks out on the Wizard; the Northwestern grapples with a burnt-out boat; a lost bet leads to cod guts on the Brenna A.

Sig fights to survive a massive heart attack; Bill learns a dark secret about his son; Josh fights to prove himself; Jake learns a valuable lesson; Jonathan appeals to the gods.

Intense weather and more damage to his battered boat take a toll on Sig's heart; the USCG attempts a dangerous medevac; Bill struggles with a water leak; Jake recruits an old friend.

Captain Sig and crew fight for their lives against an engine room fire; faulty hydraulics and a flying 800-pound pot create a deadly situation on the deck of the Saga.

The Northwestern catches fire days away from land; a family emergency forces Johnathan to make a desperate move on the Time Bandit; Josh Harris' judgment is tested.

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.

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.

The Northwestern, helmed by Captain Edgar Hansen, nears the brink of mutiny; the Saga is at risk from drunk deckhands; Captain Jonathan gambles big; Freddie Maugatai honors his skipper to the extreme.

Fueled by the chance discovery of Phil Harris' old Hawaiian charts, Josh Harris is on a mission to find out about his father's secret dream and pick up where he left off by using the maps to follow in his dad's footsteps fishing in Hawaii.

Fishing for bluefin tuna is a way of life for many residents of Gloucester, Mass. "Wicked Tuna" takes viewers into the unrelenting North Atlantic waters infamously spotlighted by the novel-turned-feature film "The Perfect Storm," to follow captains who are relied upon by their families, their shipmates, and by Gloucester itself, to haul in boatloads of the large but elusive bluefin. The pressure to deliver is unforgiving -- the fishing season is short and tuna populations are dwindling -- but one "monstah" catch can reel in just as large of a payday.

The gold rush in Alaska isn't confined to the state's precious ground. It's taking place on the sea ... or more accurately, on the bottom of the frigid Bering Sea. This series, from the creators of the Emmy-winning "Deadliest Catch," follows four gold dredges and their eccentric and driven crews who risk their lives to find as much gold as possible before winter sets in and it's too dangerous to dive. The custom-built rigs, some barely seaworthy, include an 80-foot barge run by the most successful gold dredger in Nome, Alaska, and a modified skiff that seats only two people.

When bluefin tuna season ends in Gloucester, Mass., it's just beginning in North Carolina's Outer Banks, a perfect opportunity to pit North vs. South in a pro fisherman contest for the ocean's most lucrative prey. Venturing south are the best crews from Gloucester to take on top local fleets in the treacherous Outer Banks, where the weather is more unpredictable than up north, and the seas can be extremely rough. The Gloucester rod-and-reel vets must master "greensticking" -- trolling artificial squid from a 30-foot fiberglass pole to lure the elusive species to the surface. Top-dollar bluefin can be worth as much as $20,000 each, but a short season and small government catch quota means explosive rivalries surface quickly.

A fearless guy apprentices himself to people who perform dangerous or disgusting jobs, ranging from rattlesnake catcher and zoo cleaner to road-kill collector.

Tradition collides with transformation in McCarthy, Alaska. The isolated town -- once considered to be the state's version of "Sin City" -- flourished during the Gold Rush but is now home to roughly 40 people, a mix of mavericks, risk takers and rabble rousers willing to brave extreme conditions to live free. While some believe in continuing the town's frontier way of life, others feel the future of McCarthy depends on dragging it into the modern age. Long-standing resident Jeremy Keller fights to protect its roots, while Neil Darish has purchased multiple properties in town and plans to restore its vibrancy. "Edge of Alaska" tells the story of a hinterland at a crossroads.

The breathtaking beauty of Alaska sometimes hides the fact its winters can be incredibly harsh, especially for those who live in the state's outlying areas. "Alaska: The Last Frontier" perfectly illustrates this reality, as the series profiles life for the Kilcher family in the isolated community of Homer. For four generations the Kilchers have lived off what their 600-acre homestead has provided, but cultivating that living is never easy. Led by patriarch Atz Kilcher and his brother Otto, the family spends the short summer and fall gardening, hunting and fishing for food, gathering supplies from the land and preparing their animals for the winter. Viewers, who may or may not have a fancy phone by their side while watching on their big-screen high-def TV, also see the Kilchers living off the grid, where running water and electricity aren't daily staples, nor is contact with the outside world. Atz, by the way, is the father of music superstar Jewel.

"Alaskan Bush People" is a reality-documentary series that introduces the Brown family -- Billy, wife Ami and their seven grown children who -- according to Discovery -- are interesting because "they are unlike any other family in America." The channel says they are so far removed from civilization that they often go six to nine months each year without seeing an outsider. They refer to themselves as a "wolf pack" and, perhaps due to isolation, have their own accent and dialect. The Browns live in the Copper River Valley, where temperatures can drop to 60 degrees below zero, and the family recently relocated and built a cabin there because, they say, their former home of many years was seized and burned down for being in the wrong location on public land.