A knife incident plunges the Northwestern into chaos.

“ Deadliest Catch ” is returning for the 4th episode of its 21st season on the Discovery Channel, and it’s set to debut on Friday, Aug. 22 at 8 p.m. You can watch live as it airs three ways: Sling TV , Philo (FREE trial) or DIRECTV (FREE trial).

WATCH: New episodes from Season 21 of “Deadliest Catch,” and more Discovery Channel content, here

In the 4th episode of this season, Sig will find himself in an increasingly chaotic situation aboard the Northwestern in the aftermath of an incident involving a knife, while, aboard The Confidence, a crew member will quit causing a different kind of chaos there.

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“Deadliest Catch” has, over its lon

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