Josh Hartnett is alone on a boat in the cold North Atlantic, and something underneath him is big enough to move the water on its own. That is the image Netflix leads with in the new trailer for Below, and it is smart enough not to show us what is doing the moving.
All six episodes of the limited series land on Netflix on October 8, 2026.
Calvin Penney Has More Than One Thing to Answer For
Hartnett plays Calvin Penney, a fisherman in a small Newfoundland community that is running out of fish, money, and reasons for its young people to stay. When a mysterious sea creature starts working its way through the town, Calvin ends up defending a way of life that was already halfway gone.
He is also carrying something older. Calvin’s father died decades ago under circumstances nobody ever resolved, and the series threads that unfinished business through the present-day creature story. Netflix has kept the creature itself out of the marketing so far, which is the correct instinct and also the oldest trick in the genre.
Mackenzie Davis and Charlie Heaton Anchor the Supporting Cast
Mackenzie Davis plays Fonda Howander, a marine researcher whose expertise puts her in the middle of the mystery. Charlie Heaton, still best known to a lot of horror viewers from his years on Stranger Things, plays Calvin’s son Wade.
The wider cast includes Willow Kean as Ruth, Ruby Stokes as Mary, Rohan Campbell as Jay, Kaleb Horn as Noah, plus Natasha Henstridge and Mary Walsh. Jesse McKeown created the series and serves as showrunner.
Newfoundland Is Doing Real Work Here
Below filmed on location in Newfoundland, working out of St. John’s and drawing on local crew and local performers rather than dressing up somewhere cheaper and calling it the Atlantic. That choice shows in the trailer, where the coastline reads as a genuinely hostile place long before anything surfaces.
McKeown has framed the show around that contrast, the unforgiving landscape against a warm and tightly bound community, and the story leans as hard on family drama, local mythology, and the collapse of a fishing economy as it does on the thing in the water.
Netflix officially files Below under thriller. Horror audiences can read the assignment for themselves: a creature nobody has seen, a coastal town with a body count problem, and a family secret buried offshore. That is a genre lineage running straight back through The Fog and Jaws, whatever the category tag says.
All six episodes arrive on Netflix on October 8.
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