When is the Beware Boiúna release date?

Beware Boiúna premiered at Fantastic Fest on 17 September 2026 and opened in US theatres on 2 October 2026. A US digital release is listed for 3 November 2026.

Where can I watch Beware Boiúna?

As of 24 October 2026, the film is showing in US cinemas. A digital release is listed for 3 November 2026. Streaming platforms are not yet listed in TMDB/JustWatch data as of 24 October 2026.

Who is in the cast of Beware Boiúna?

The cast includes Logan Marshall-Green as Brennan Malloy, Kiana Madeira as Lena, Jessica Rothe as Alli, Jackson Bews as Shawn, Juan Pablo Shuk as Miguel and Will Close as Callum. Vicente Peña, Jaime Newball, Mateo Moreno and Nelson Camayo also appear.

What is Beware Boiúna about?

A humanitarian medical mission in the Brazilian Amazon turns into a fight for survival when Boiúna, a colossal serpent from Brazilian folklore, awakens and hunts the group through the rainforest.

How long is Beware Boiúna and what is it rated?

Beware Boiúna runs 104 minutes (1 hour 44 minutes) and is rated R in the US.

Beware Boiúna (2026): Cast, Plot & Where to Watch

Beware Boiúna Plot Summary (No Spoilers)

A group of people travels deep into the Amazon rainforest on a medical and humanitarian mission, setting out to bring care to remote communities in Brazil. The jungle is vast, isolated and far from any help, and the team soon finds it is not alone. Something ancient has stirred beneath the canopy and along the waterways. Boiúna, a gigantic serpent rooted in Brazilian folklore, has returned to the territory it considers its own.

The mission shifts from saving lives to staying alive. The group must cross unforgiving terrain while being hunted by a creature far larger and older than anything they were prepared for. The film’s tagline, “Witness terror on a gigantic scale,” sums up the approach: survival horror where the rainforest is as dangerous as the monster within it. Logan Marshall-Green plays Brennan Malloy, alongside Kiana Madeira as Lena and Jessica Rothe as Alli. The setting moves between English and Portuguese, which suits a story about outsiders working in a world that belongs to someone else.

Beware Boiúna — Mood illustration, not a still from the film — Mood illustration, not a still from the film

What Makes Beware Boiúna Notable: Cast, Director and Context

Before you read any Beware Boiúna review, here is what defines the film on paper:

Director: Mike P. Nelson
Writer: Alan B. McElroy
Main cast: Logan Marshall-Green (Brennan Malloy), Kiana Madeira (Lena), Jessica Rothe (Alli), Jackson Bews (Shawn), Juan Pablo Shuk (Miguel), Will Close (Callum), Vicente Peña (Pedro), Jaime Newball (Raúl), Mateo Moreno (Diego) and Nelson Camayo (Guilherme)
Genre: Horror, thriller, creature feature
Runtime: 104 minutes (1 h 44 min)
Languages: English and Portuguese
Production: A US–German–Colombian co-production from Constantin Film, JB Pictures, Jaguar Bite and North.Five.Six.

The film belongs to the giant-animal horror tradition and gives it a specific cultural anchor. Its monster comes from Brazilian folklore rather than a lab or a generic mutation, and the international cast mixes North American and Latin American actors. The film premiered at Fantastic Fest, the genre festival in Austin, Texas, before its theatrical release.

Who Will Enjoy Beware Boiúna

Fans of creature features and giant-snake films who want a large-scale monster at the centre of the story
Viewers who like survival horror set in remote, hostile landscapes
Anyone curious about horror drawn from Brazilian and Amazonian folklore
Followers of Logan Marshall-Green, Kiana Madeira or Jessica Rothe
Audiences comfortable with R-rated intensity and animal-attack scenes

Beware Boiúna Release Date and Where to Watch (US)

Festival premiere: 17 September 2026 at Fantastic Fest
US theatrical release: 2 October 2026, rated R
US digital release: 3 November 2026, rated R

As of 24 October 2026, Beware Boiúna is in its US theatrical window, so cinemas are currently the main way to see it. A digital release is listed for 3 November 2026. Specific streaming or rental platforms are not yet listed in TMDB/JustWatch data as of 24 October 2026. Check back closer to the digital date for availability. A trailer has been released and is a good way to get a sense of the film’s tone before buying a ticket.

Trailer

Cast

Logan Marshall-Greenas Brennan MalloySee credits →
Kiana Madeiraas Lena
Jessica Rotheas Alli
Jackson Bewsas Shawn
Juan Pablo Shukas Miguel
Will Closeas Callum
Vicente Peñaas Pedro
Jaime Newballas Raúl

Photo: TMDB

FAQ

When is the Beware Boiúna release date?: Beware Boiúna premiered at Fantastic Fest on 17 September 2026 and opened in US theatres on 2 October 2026. A US digital release is listed for 3 November 2026.
Where can I watch Beware Boiúna?: As of 24 October 2026, the film is showing in US cinemas. A digital release is listed for 3 November 2026. Streaming platforms are not yet listed in TMDB/JustWatch data as of 24 October 2026.
Who is in the cast of Beware Boiúna?: The cast includes Logan Marshall-Green as Brennan Malloy, Kiana Madeira as Lena, Jessica Rothe as Alli, Jackson Bews as Shawn, Juan Pablo Shuk as Miguel and Will Close as Callum. Vicente Peña, Jaime Newball, Mateo Moreno and Nelson Camayo also appear.
What is Beware Boiúna about?: A humanitarian medical mission in the Brazilian Amazon turns into a fight for survival when Boiúna, a colossal serpent from Brazilian folklore, awakens and hunts the group through the rainforest.
How long is Beware Boiúna and what is it rated?: Beware Boiúna runs 104 minutes (1 hour 44 minutes) and is rated R in the US.

Sources

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