Beware Boiúna is a 2026 creature-feature thriller directed by Mike P. Nelson. The movie is being released in Brazil under the Portuguese title Boiúna – Terror no Amazonas and brings an ancient Amazonian legend into a survival-horror story.
The film stars Kiana Madeira, Jessica Rothe and Logan Marshall-Green as members of a medical mission that travels deep into the Amazon rainforest. Their arrival awakens a gigantic predator known as the Boiúna, turning their humanitarian mission into a fight for survival.
In Brazil, the movie will be distributed by Paris Filmes and is scheduled to open in theaters on December 3, 2026.
Beware Boiúna (2026) Quick Wiki
| Information | Details |
|---|---|
| Original Title | Beware Boiúna |
| Brazilian Title | Boiúna – Terror no Amazonas |
| Year | 2026 |
| Genre | Horror, Thriller, Action |
| Director | Mike P. Nelson |
| Writers | Tony Giglio, Alan B. McElroy, Mike P. Nelson |
| Main Cast | Kiana Madeira, Jessica Rothe, Logan Marshall-Green |
| Country | United States / Germany / Colombia |
| Runtime | Approximately 104 minutes |
| Brazil Distributor | Paris Filmes |
| Brazil Theatrical Release | December 3, 2026 |
| Original Language | English |
| Brazilian Title | Boiúna – Terror no Amazonas |
The Spanish film classification database lists the production at 103 minutes, while current movie listings generally give it approximately 104 minutes.
What Is Beware Boiúna About?
The story follows a group of young doctors who travel deep into the Amazon rainforest as part of a humanitarian medical mission.
Their journey takes them into an isolated environment where they expect to deal with the challenges of the jungle and the needs of local communities.
Instead, their arrival attracts something far more dangerous.
An ancient predator known as the Boiúna awakens and begins defending its territory.
The creature is portrayed as a gigantic serpent capable of moving through both land and water. What starts as a medical mission soon becomes a desperate battle in which the group must figure out how to survive in an environment controlled by a predator they barely understand.
The official Brazilian synopsis describes the Boiúna as an ancient predator returning to defend its territory, with the jungle becoming the setting for a struggle between hunter and hunted.
Boiúna – Terror no Amazonas Story
The movie takes place around the Amazon rainforest and the Rio Curuçá region.
The medical team enters the jungle with different personal motivations, but those differences become less important once the Boiúna begins hunting them.
The creature is not presented simply as an ordinary giant snake. The film connects it with Amazonian folklore and portrays it as an ancient predator associated with the waters and territory of the region.
As the characters attempt to escape, the distinction between the people being hunted and the environment around them becomes increasingly important.
The jungle itself becomes part of the survival challenge.
What Is the Boiúna?
The Boiúna is a legendary giant serpent associated with Amazonian folklore.
It is also known in Brazilian cultural descriptions as cobra-grande, mãe-do-rio and senhora-das-águas.
The movie uses this folklore as the foundation for its giant-creature story, transforming the legendary serpent into the central threat of a modern survival thriller.
Rather than adapting a traditional legend literally, Beware Boiúna uses the creature as the antagonist of a cinematic Amazon survival story.
Beware Boiúna Cast
Kiana Madeira as Lena
Kiana Madeira stars as Lena, one of the central characters caught in the Amazon survival crisis.
Madeira is known for projects including the Fear Street trilogy and Trinkets.
In Beware Boiúna, she joins the medical mission that becomes the target of the giant predator.
Jessica Rothe as Alli
Jessica Rothe plays Alli.
Rothe is best known for the Happy Death Day movies, where she played Tree Gelbman.
Her role in Beware Boiúna places her in a very different kind of thriller, with the Amazon rainforest and a giant predator replacing the time-loop horror of her earlier franchise.
Logan Marshall-Green as Brennan Malloy
Logan Marshall-Green plays Brennan Malloy.
The actor has appeared in films and television projects including Upgrade, Prometheus and The Invitation.
He is one of the primary members of the group attempting to survive the Boiúna.
Supporting Cast
The supporting cast includes:
- Juan Pablo Shuk as Miguel
- Will Close as Callum
- Jackson Bews as Shawn
- Vicente Peña
- Jaime Newball
- Mateo Moreno
- Nelson Camayo
- Christophe de Geest
Current cast listings identify Madeira, Rothe and Marshall-Green as the principal stars.
Who Directed Beware Boiúna?
Mike P. Nelson directed Beware Boiúna.
Nelson previously directed Wrong Turn (2021) and Silent Night, Deadly Night (2025).
For Beware Boiúna, he moves into giant-creature territory, combining action, survival thriller elements and horror.
The screenplay credits include Tony Giglio, Alan B. McElroy and Mike P. Nelson, with Giglio and McElroy also credited with the story/screenwriting development.
Beware Boiúna Release Date
The movie had its world premiere at Fantastic Fest in the United States on September 17, 2026. Its U.S. theatrical release is scheduled for October 2, 2026.
Brazil Release Date
For Brazilian audiences, the movie will be released as:
Boiúna – Terror no Amazonas
Brazilian theatrical release: December 3, 2026
Paris Filmes is handling the Brazilian distribution. The distributor announced the film’s Brazilian release and promotional materials in September, with the December date subsequently announced.
Is Beware Boiúna a Portuguese Movie?
No.
The movie’s original language is English, although it has a Brazilian Portuguese title, Boiúna – Terror no Amazonas, for its Brazilian theatrical release.
The production itself is an international project involving the United States, Germany and Colombia, and current listings identify English as its primary language.
Brazilian viewers can check their local cinema listing for the available Portuguese subtitle or dubbing option when tickets and showtimes are released.
Where to Watch Boiúna – Terror no Amazonas in Brazil?
The movie is receiving a theatrical release in Brazil through Paris Filmes.
Brazilian audiences will be able to look for Boiúna – Terror no Amazonas at participating cinemas beginning December 3, 2026.
The film is not being presented as an immediate streaming release in Brazil. Its confirmed Brazilian distribution is theatrical.
Beware Boiúna Trailer
The official trailer introduces the medical team as they enter the Amazon rainforest.
The atmosphere quickly changes when the group realizes that the jungle contains a massive predator.
The trailer highlights:
- The Amazon rainforest
- The medical mission
- The giant Boiúna
- River and jungle sequences
- Survival scenes
- Chase sequences
- Giant-snake attacks
- The struggle between humans and the creature
The official Lionsgate trailer describes the movie as a fight for survival after the ancient predator awakens to reclaim its domain.
Beware Boiúna Genre
The movie combines several genres:
- Creature Horror
- Action
- Thriller
- Survival
- Adventure
Its central concept is closer to a giant-animal survival thriller than a traditional supernatural horror film.
Beware Boiúna Runtime
The movie runs for approximately 104 minutes, although some official classification information lists the runtime as 103 minutes.
Is Beware Boiúna Based on a True Story?
No.
The movie is a fictional creature thriller inspired by the legendary Boiúna of Amazonian folklore.
The giant serpent and the events involving the medical team are part of the film’s fictional story.
Is Boiúna a Real Snake?
The Boiúna is not a scientifically documented giant snake species.
It comes from Amazonian folklore, where the legendary serpent is associated with rivers, water and the Amazon environment.
The movie takes that legendary creature and turns it into a large-scale cinematic predator.
Beware Boiúna Production
The movie was produced with Robert Kulzer and Jeremy Bolt among its producers.
Executive producers include Mike P. Nelson, Michael J. Rothstein, Samuel Hall, Warren Goz and others.
The film was shot in and around locations connected with its Amazon setting, helping the production create a more authentic jungle-survival atmosphere.
Beware Boiúna vs Traditional Giant-Snake Movies
At first glance, Beware Boiúna may remind viewers of other giant-snake movies.
However, the film’s main distinction is its connection to Amazonian folklore.
Instead of introducing a completely fictional laboratory-created monster, the movie builds its central creature around a legendary serpent associated with the Amazon.
The story also combines the creature with a humanitarian medical mission, giving the characters a reason to travel deep into the jungle.
Is Beware Boiúna Coming to Theaters?
Yes.
The movie is receiving a theatrical release in multiple territories.
Major Release Dates
| Country / Event | Release |
|---|---|
| Fantastic Fest, USA | September 17, 2026 |
| United States | October 2, 2026 |
| Brazil | December 3, 2026 |
| Germany | October 8, 2026 |
| Spain | October 16, 2026 |
Release dates can vary by territory.
Beware Boiúna 2026 FAQs
What is the Brazilian title of Beware Boiúna?
The Brazilian title is Boiúna – Terror no Amazonas.
When does Boiúna – Terror no Amazonas release in Brazil?
The movie is scheduled to arrive in Brazilian cinemas on December 3, 2026.
Who stars in Beware Boiúna?
The main cast includes Kiana Madeira, Jessica Rothe and Logan Marshall-Green.
Who directed Beware Boiúna?
Mike P. Nelson directed the movie.
What is Beware Boiúna about?
It follows a group of young doctors on a humanitarian mission in the Amazon who encounter a gigantic ancient predator known as the Boiúna.
Is Beware Boiúna in Portuguese?
The movie’s original language is English. Its Brazilian theatrical title is Boiúna – Terror no Amazonas.
Is Boiúna a real creature?
The Boiúna is a legendary creature from Amazonian folklore rather than a scientifically recognized animal.
How long is Beware Boiúna?
The runtime is approximately 104 minutes.
Is Beware Boiúna a horror movie?
Yes. It is primarily described as a horror, thriller and action/creature movie.
Is Beware Boiúna on Netflix?
No official Netflix release has been announced. The movie’s current confirmed releases are theatrical.
Is Beware Boiúna available on OTT?
There is no confirmed Brazilian OTT release date at this time.
Final Thoughts
Beware Boiúna, released in Brazil as Boiúna – Terror no Amazonas, takes one of the Amazon’s most recognizable legendary creatures and turns it into a modern giant-snake survival thriller.
With Kiana Madeira, Jessica Rothe and Logan Marshall-Green leading the cast and Mike P. Nelson behind the camera, the film combines Amazonian folklore with action, horror and creature-feature elements.
For Brazilian moviegoers, the key date is December 3, 2026, when Paris Filmes is scheduled to bring Boiúna – Terror no Amazonas to theaters.
