Captains Joe and Tyler score some bluefin tuna, but second-generation harpooner Niko Chaprales struggles; Niko switches up his tactics in hopes of scoring big.
Oregon homesteaders find their dream in jeopardy after an accident; when the Raneys arrive, they face a daunting rescue where a ruined bridge has cut them off.
The Raneys revamp a treehouse cabin that's on the verge of collapsing, with Marty overhauling its base and Matt adding a workshop for making leather goods.
The Raneys rework Kevin Tubb's faulty electrical work, then build the first hydro-electric wheel on Little Susitna River to ensure the homestead remains safe.
Juan may have met his match trying to help two Montana soldiers hit the jackpot, and with the winter freeze mere days away, he's forced to call in help.
Parker unleashes chaos as the team tries to get four wash plants running; Tony splurges on a new wash plant to get more gold; Kevin tries to broker a deal.
After the government closes down King Crab, the captains rally together to save the industry from fading away; Sig hunts invasive Russian King Crab in Norway.