Netflix has released the first spinge-tingling teaser trailer for the thriller series “Below.”

In the teaser for the six-episode series, which can be seen in its entirety below, a small seaside town is terrorized by a mysterious sea creature. “Below” will have its world premiere as part of the Primetime program at TIFF 2026 on Sept. 10 before its debut on Netflix on Oct. 8.

Josh Hartnett stars along with Charlie Heaton, Mackenzie Davis, Ruby Stokes, Kaleb Horn, Rohan Campbell, and Willow Kean.

The official description of the series states:

“Calvin Penney (Hartnett) is a big‑hearted but stubborn fisherman living in a small Newfoundland town, who’s still haunted by his father’s mysterious death from decades ago. When an unidentified sea creature begins terrorizing his hometown, Calvin must fight to hold his close-knit community together. Determined to keep his son Wade (Heaton) and the rest of his family safe, he teams up with a visiting marine researcher (Davis) to confront the creature and reveal the island’s buried secrets before it’s too late.”

The show was originally announced in February 2025, with Hartnett officially joining the series not long after. He previously starred in shows like “Penny Dreadful,” “Die Hart,” and “Paradise Lost.”

“Below” hails from creator, showrunner, and executive producer Jesse McKeown. Hartnett is an executive producer in addition to starring. Jessica Rhoades executive produces via Pacesetter, with Chris Hatcher, Jamie Childs, Louise Sutton, and Sharon Hall also executive producing. The series was filmed on location in St. John’s, Newfoundland, Canada.