Beware Boiúna
Upcoming 2026 survival horror film directed by Mike P. Nelson
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Beware Boiúna is an upcoming American survival monster horror film directed by Mike P. Nelson and written by Alan B. McElroy, from a story by McElroy and Tony Giglio. The film stars Kiana Madeira, Jessica Rothe, and Logan Marshall-Green. It follows a medical mission deep in the Amazon rainforest that encounters a colossal mythical serpent.
- Alan B. McElroy
- Tony Giglio
| Beware Boiúna | |
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Theatrical release poster | |
| Directed by | Mike P. Nelson |
| Screenplay by | Alan B. McElroy |
| Story by |
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| Produced by | |
| Starring | |
| Cinematography | Nick Junkersfeld |
| Edited by | Tom Elkins |
| Music by | Stephen Lukach[1] |
Production companies |
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| Distributed by | Lionsgate Films |
Release date |
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| Countries | United States Germany |
| Language | English |
The film was developed under the working titles Titan and Boiúna: Legend of the Amazon[2] before receiving its final title. It is scheduled to be theatrically released in the United States by Lionsgate on October 2, 2026.
Premise
Deep in the Amazon rainforest along the Curuçá River, a routine humanitarian medical mission turns into a desperate struggle for survival when the group's presence awakens the "Boiúna"—a colossal, ancient mythical serpent determined to reclaim its domain.
Cast
- Kiana Madeira[3]
- Jessica Rothe[4][5]
- Logan Marshall-Green as Brennan Malloy[6]
- Jackson Bews as Shawn
- Juan Pablo Shuk as Miguel
- Will Close as Callum
- Vicente Peña as Pedro
- Mateo Moreno as Diego
- Jaime Newball as Raúl
- Christophe de Geest as Proctor
- Nelson Camayo as Guilherme
Production
Development
The project was first announced under the working title Titan, bringing together director Mike P. Nelson and screenwriter Alan B. McElroy following their collaboration on the 2021 Wrong Turn reboot. Production later shifted under the working title Boiúna: Legend of the Amazon before being finalized as Beware Boiúna. [7][8]
The film is produced by Robert Kulzer of Constantin Film and Jeremy Bolt of JB Pictures, continuing a collaboration with producers from franchises like Resident Evil.[9]
Writing and Research
The screenplay was penned by Alan B. McElroy with a story co-developed by McElroy and Tony Giglio. The narrative draws heavily from Brazilian folklore, specifically the legend of the Boiúna (or Cobra Grande), a gigantic mythical serpent said to inhabit the Amazon river basin. Director Mike P. Nelson noted that the production aimed to ground the creature feature in realistic stakes, focusing heavily on character development, regional atmosphere, and authentic environmental tension before introducing the massive legacy predator.[10]
Filming
Principal photography took place in Amazon rainforest, requiring the crew and cast—including Madeira, Rothe, and Marshall-Green to shoot around the Amazon River and the jungle regions near Leticia, Colombia.[11] Because of the remote setting and local ecosystem, the production utilized professional animal wranglers on set to protect the cast and crew from potential wildlife hazards, such as venomous and poisonous species native to the Amazon.[12][13]
Release
Beware Boiúna is distributed by Lionsgate Films. The official trailer and promotional rollout debuted in August 2026, featuring viral marketing campaigns.[14][15] The film is scheduled for a theatrical release in the United States on October 2, 2026.[16][17]