When processors shut down due to outbreaks, Sig bets he can zero in on a rare "crab highway" before there's no place to deliver. Josh and Casey race to deliver live crab after their pump fails, while Harley risks shipwreck to be first to enter St. Paul.

As Sig Hansen approaches "greatest of all time" status as a Bering Sea crab captain of nearly a half century, his hard-won ways are put to the test when daughter Mandy Hansen pressures him to cement her spot as heir to the Hansen Family Legacy.