Keith and Junior form a covert alliance on the Bering Sea; Elliot debuts his new boat on the dangerous blue crab grounds; the Northwestern crew faces a surprise challenge.

Injuries and sickness plague the Seabrooke and the Wizard.

Junior and Elliott team up.

Tempers flare aboard the Northwestern.

Sig reclaims the Northwestern; Jake pursues his dream of becoming a captain.

Junior tends to his father; a newcomer thinks about quitting.

Crew members are pushed to their breaking point.

Tensions rise aboard the Wizard.