Josh Hartnett battles a sea monster in creepy Netflix show

When you think of rugged landscapes and deep, unsettling mysteries, you think of Newfoundland. Now, Netflix is diving into that icy, isolated world for a thrilling new miniseries called Below, starring Josh Hartnett.

The teaser trailer has dropped, hinting at a story far more captivating than just a simple fishing trip. It casts actor Josh Hartnett as Calvin Penney, a fisherman whose quiet life is violently upended when his entire village is attacked by an unseen sea monster. Faced with this terrifying reality, Calvin must venture deep beneath the waves to uncover the truth, relying on the cooperation of his fellow residents.

The premise is pure cinematic gold: an isolated community grappling with a supernatural threat lurking just beneath the surface. The trailer doesn’t reveal the creature’s full design, but it masterfully sets the stage, showing haunting glimpses of a house swallowed by the sea, emphasizing the terrifying isolation and danger of their environment.

This isn’t just an adventure; it’s a journey into the unknown, framed by the dramatic, stark beauty of Newfoundland. The showrunner, Jesse McKeown, emphasized that choosing this specific location was key to the series’ unique atmosphere. “It’s such a unique landscape and so rugged, dangerous, isolated, and scary in a lot of ways,” McKeown noted about filming on location.

The cast brings a dynamic ensemble to this underwater mystery. Alongside Hartnett, the series features Mackenzie Davis, Charlie Heaton, Natasha Henstridge, Ruby Stokes, Kaleb Horn, Willow Kean, and Rohan Campbell. Davis herself compared her character’s interplay with Hartnett’s to that of “two buddy cops solving a mystery,” suggesting an engaging blend of action, character drama, and investigative suspense.

The actors immersed themselves in the setting during production, reflecting the authenticity of their portrayal. While Hartnett spent time listening to local radio daily, Heaton explored the bars outside St. John’s, Newfoundland’s capital, bringing a genuine flavor to the experience.

Below is set to stream on Netflix and will be released on October 8, 2026. Prepare to dive into a world where the dangers of the deep are just the beginning of the mystery.