Beware Boiúna recap, summary, and ending explained

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Plot Overview

A medical team carrying out a humanitarian mission along Brazil’s Curuçá River in the Amazon rainforest disturbs a mythical creature known as Boiúna—a colossal, ancient serpent that rules both land and water. When the doctors unknowingly intrude on her domain, Boiúna awakens and attacks. The team’s mission devolves into a desperate fight for survival in which the lines between hunter, prey, and hero blur as they try to escape the jungle’s unforgiving power.

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Key Details

Cast includes Logan Marshall-Green (as Brennan Malloy), Jessica Rothe, and Kiana Madeira, among others.

Directed by Mike P. Nelson; written by Nelson along with Tony Giglio and Alan B. McElroy. Filmed in Colombia’s Amazon Jungle.

Runtime is about 1 hour 44 minutes. R-rated for bloody violence, intense creature attacks, grisly injury, strong language, and overall horror-thriller tone.

Release date is October 2, 2026, in the U.S., with limited theatrical release.

Key details:

• Lena, the main character, reconnects with her brother and faces her grief, suggesting personal growth but not triumph over the creature’s power. - The final showdown takes place on a construction site, where human tools are attempted against Boiúna—but this only highlights how little control people really have in the jungle. - There's a standout sequence near the end where Lena is submerged in thick, muddy water with the snake circling—a visually striking moment that underscores humanity’s vulnerability. - The film ends without defeating the monster; instead, it underlines that the jungle—and Boiúna—are ever-present and untamable forces.

So, the ending doesn’t offer a clean resolution. Lena survives in the sense she’s alive and changed, but ultimate survival over Boiúna—nature’s primal force—is left unsettled.