What Is Beware Boiúna About?
The premise of Beware Boiúna in 330 words, with nothing given away. The full story follows below.
Beware Boiúna plunges viewers deep into the heart of the Amazon rainforest, where a small medical boat called the R.R. Hermes carries a team of physicians on a humanitarian mission to remote river villages. The crew includes the warmhearted Allison, the steady Callum, the seasoned Miguel, the paternal Raul, and Lena, a young woman whose devotion to the journey runs deeper than medicine alone. Lena has come to the Amazon searching for her brother Jorge, lost years ago in the jungle, and she carries that hope alongside the gratitude she feels toward Raul, who has long been a guiding presence in her life.
As the boat drifts along the winding waterways, the landscape reveals itself in layers of beauty and unease. The rainforest pulses with life, but it also hums with warnings whispered by the locals — stories of the Boiúna, a colossal serpentine guardian said to decide who lives and dies beneath the river’s surface. The crew’s efforts to earn the trust of the villagers unfold gently at first, with laughter shared between Allison and the children, yet every kindness seems to brush against something older and less forgiving in the jungle’s memory.
The atmosphere grows heavier as the crew presses further inland, where outsiders are unwelcome and the river holds secrets of its own. Tensions between those who respect the forest and those who exploit it simmer beneath the surface, hinting at conflicts the physicians are only beginning to glimpse. With every village visited, the sense of being watched — by the people, by the jungle, by something ancient lurking just beneath the water — becomes harder to ignore.
Built on creeping dread and the stark contrast between healing intentions and primal survival, Beware Boiúna crafts a survival tale where compassion and danger are inextricably tangled. The stage is set for a journey where the Amazon itself becomes a character — vast, watchful, and ready to answer the crew’s presence with forces far older than medicine can reach.
What Happens in Beware Boiúna?
The complete story of Beware Boiúna, from the first scene to the last, in 943 words (about 4 minutes). Spoilers throughout.
Spoilers ahead
The film opens in Colombia, along the Amazon River. A tribe called the Yaguari are closing in on an illegal mining camp. As the villagers force the miners out, a gigantic snake known as Boiúna emerges and attacks the miners.
Somewhere else along the river, a medical boat, R.R. Hermes, is making its way to a nearby village. They include Allison (Jessica Rothe), Callum (Will Close), Miguel (Juan Pablo Shuk), Raul (Jaime Newball), and Lena (Kiana Madeira). Lena has been searching for her brother Jorge (Sergio Herrera), who was lost somewhere in the Amazon, but she believes he is still alive. She also considers Raul to be like a father figure, and he views her as a surrogate daughter.
The crew arrives at the village and brings medical attention to the locals after earning their trust. Alli is playing with some kids, when one of the boys loses his ball in the river. Alli tries to stop him from going further, and a local male adult tries to get the kid out. Boiúna emerges and snatches the man, even as Alli tries to save him, but she can only watch him get taken away.
Later, the crew stops at a bar, where Alli sees a large drawing of Boiúna on the wall. Lena explains that the snake is a guardian of the rainforest that decides who lives and dies. They meet a group of profiteers, led by Brennan Malloy (Logan Marshall-Green). The crew are not pleased with their business but decide to leave them alone. Brennan’s brother Shawn (Jackson Bews) appears to take an interest in Alli but is seemingly too shy to talk to her.
Alli goes to untie the profiteers’ boat so it can drift away. Shawn catches her while totally drunk. He tries to initiate a sexual encounter, but Alli sees he’s drunk and refuses. When Shawn tries to take it further, Lena shows up and tries to intervene, but Shawn punches her. Lena pushes him and causes Shawn to fall and hit his face on the dock, killing him. Alli panics and thinks they need to come clean, but Lena warns her that those men would kill them for this. They dump Shawn’s body in the water, unaware that they have been spotted by one of the local boys.
The Hermes crew departs to go to another village. Brennan and his men discover Shawn’s corpse in the water, and Brennan finds the boy who saw everything to spill the beans. Brennan contacts the Hermes crew and demands that Lena and Alli be brought back, but the crew refuses since they know it was in self-defense (though Alli admits that Shawn saw her untying their boat). Against his men’s desires, Brennan decides to pursue the crew on his own boat.
As they move further, the ladies nearly dive into the water until a crocodile’s corpse pops up. Lena is startled and cuts her leg against part of the boat. Miguel and Raul inspect the crocodile corpse, as it has apparently been regurgitated. Meanwhile, Lena tells Alli about how her and Jorge’s parents were brutally murdered when they were children after refusing to give up their land. They were found and protected by the Yaguari, but Lena got separated from Jorge and has been searching for him ever since.
At night, the crew end up stopping their boat somewhere dark. Brennan and his men eventually catch up to the crew and hold the men hostage. Boiúna emerges and snatches one of Brennan’s men, while Callum accidentally gets shot in the ensuing chaos. Miguel also gets snatched and killed by Boiúna. Alli, Lena, and Raul run back to the boat, but Raul ends up taken by the snake as well. Boiúna then uses her strength to capsize the boat, sending Alli and Lena into the water. They both make it to shore, but Alli calling out for Lena alerts Boiúna, leading to her getting eaten as well and leaving Lena alone.
Lena finds Brennan, whose men have all been killed and eaten as well. She considers killing him but instead forms a truce with him so that they can survive. They are eventually found by Jorge and his companion, who are part of the Yaguari. When Brennan suggests that they kill the snake, Jorge refuses since Boiúna is regarded as being necessary to the land. His friends gets chomped by Boiúna, forcing them to run.
Lena gets separated from Jorge again and ends up falling into a large mud pit. Brennan tries to help pull her out but ends up running away after he cannot reach her. After Boiúna slithers past her and doesn’t notice her, Lena is able to pull herself out. Meanwhile, Brennan runs until the guilt from abandoning Lena, plus the deaths of Shawn and their men, starts to hit him hard.
Lena ends up at a construction site where Boiúna attempts to attack her. She hides inside a crane machine and uses the crane to try and pick the snake up and stop her from attacking. Lena ends up getting a piece of equipment impaled into her leg, trapping her from escaping. Brennan returns with a chainsaw and partially slices into Boiúna, giving Lena a chance to fight back. Boiúna devours Brennan but Lena manages to stab the snake in the side. Jorge and the other Yaguari arrive to watch as Lena defiantly stares down the massive serpent. Boiúna ultimately decides to spare Lena and she retreats. Lena and Jorge embrace, and she decides to stay with the Yaguari.
The film ends as Lena joins the Yaguari in infiltrating the mining camp from the start of the film.
Beware Boiúna Timeline: Every Key Event in Order
15 key events in the order they happen, from “Boiúna Attacks the Mining Camp” to “Reunion and the Raid”. 15 events name a place, across 12 locations.
- 1
Boiúna Attacks the Mining Camp
The film opens in Colombia along the Amazon River, where the Yaguari tribe closes in on an illegal mining camp. As the villagers force the miners out, a gigantic snake known as Boiúna emerges and attacks the miners.
Where:Amazon River, Colombia
- 2
The Hermes Crew Journeys Up the River
A medical boat, the R.R. Hermes, makes its way toward a nearby village carrying Allison, Callum, Miguel, Raul, and Lena. Lena has been searching for her brother Jorge, who went missing somewhere in the Amazon, but she firmly believes he is still alive.
Where:Amazon River
- 3
Medical Aid at the Village
The crew arrives at a local village and earns the residents' trust before providing medical attention. Alli bonds with the local children while playing with them by the river.
Where:Village along the river
- 4
Boiúna Snatches a Villager
While Alli is playing with the kids, a boy loses his ball in the river and a local man goes in after him. Boiúna emerges and snatches the man, and Alli tries to save him but can only watch helplessly as he is dragged away.
Where:River near the village
- 5
The Bar Encounter
The crew stops at a bar, where Alli sees a large drawing of Boiúna on the wall and Lena explains that the snake is a guardian of the rainforest that decides who lives and dies. There they meet a group of profiteers led by Brennan Malloy, whose shy brother Shawn takes an interest in Alli.
Where:Bar along the river
- 6
Shawn's Death on the Dock
Alli sneaks off to untie the profiteers' boat so it can drift away, but is caught by a drunken Shawn who tries to force himself on her. When Lena intervenes, Shawn punches her, and as Lena pushes him back, he falls and fatally hits his face on the dock. Panicking, the women dump Shawn's body in the water, unaware that a local boy has witnessed everything.
Where:Dock near the bar
- 7
Brennan Discovers the Truth
After the Hermes crew departs for another village, Brennan and his men discover Shawn's corpse in the water. He finds the boy who saw the incident and learns what happened, then demands that Lena and Alli be handed over. When the crew refuses, knowing it was self-defense, Brennan defies his own men and sets off in pursuit on his own boat.
Where:Amazon River
- 8
The Regurgitated Crocodile and Lena's Past
As the crew travels on, a crocodile's corpse pops up near the boat, startling Lena and causing her to cut her leg. Miguel and Raul inspect the body and realize the animal appears to have been regurgitated. Meanwhile, Lena tells Alli how she and Jorge were protected by the Yaguari after their parents were brutally murdered for refusing to give up their land, and how she has been searching for her lost brother ever since.
Where:Aboard the R.R. Hermes
- 9
Brennan's Nighttime Ambush
After stopping their boat somewhere dark for the night, the crew is caught by Brennan and his men, who hold the men hostage. Boiúna abruptly emerges, snatching one of Brennan's men, Miguel, and Raul, while Callum is accidentally shot in the chaos. The snake then uses her strength to capsize the boat, sending Alli and Lena into the water.
When:Night Where:Amazon River
- 10
Alli is Taken
Alli and Lena both manage to make it to shore after the boat capsizes. However, Alli calling out for Lena alerts Boiúna to their location, and the serpent devours her, leaving Lena completely alone.
When:Night Where:Riverbank
Show the other 5 events of Beware Boiúna Hide the last 5 events
- 11
An Uneasy Truce
Lena finds Brennan, whose men have all been killed and eaten, and considers killing him before the two form a truce to survive. They are eventually found by Jorge, who is living with the Yaguari, but he refuses to help kill Boiúna since the snake is regarded as necessary to the land. When his friends are devoured by the snake, the group is forced to run.
Where:Rainforest
- 12
The Mud Pit
Lena gets separated from Jorge again and falls into a large mud pit. Brennan tries to pull her out but gives up and runs away when he cannot reach her. After Boiúna slithers past without noticing her, Lena manages to free herself, while Brennan is gripped by guilt over abandoning her and over the deaths of Shawn and his men.
Where:Mud pit in the jungle
- 13
Trapped at the Construction Site
Lena arrives at a construction site where Boiúna attempts to attack her. She hides inside a crane machine and uses the crane to try picking the snake up, but a piece of equipment gets impaled into her leg, leaving her trapped and unable to escape.
Where:Construction site
- 14
The Final Battle with Boiúna
Brennan returns with a chainsaw and partially slices into Boiúna, giving Lena a chance to fight back. The snake devours Brennan, but Lena manages to stab it in the side as Jorge and the other Yaguari arrive to watch. Lena defiantly stares down the massive serpent, and Boiúna ultimately spares her and retreats.
Where:Construction site
- 15
Reunion and the Raid
Lena and Jorge finally embrace in a heartfelt reunion, and she decides to stay with the Yaguari. The film ends as Lena joins the tribe in infiltrating the illegal mining camp from the opening of the film.
Where:Mining camp
Who Are the Main Characters in Beware Boiúna?
4 characters, among them Lena (Kiana Madeira), Alli (Jessica Rothe) and Brennan Malloy (Logan Marshall-Green): who each one is and the part they play in the story. Every profile links to the actor’s page.
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Lena (Kiana Madeira)
Played by Kiana Madeira
Lena is a determined and resourceful young woman who embarks on a perilous journey to find her lost brother, Jorge. Her deep connection to her roots and the Yaguari tribe fuels her resilience, making her a strong character who faces overwhelming odds. As she navigates the struggles of survival and loss, Lena evolves, ultimately forming a bond with those who protect the land and re-evaluating her priorities.
- 🧭 Survivor
- 💔 Sisterly Love
- 🌿 Guardian
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Alli (Jessica Rothe)
Played by Jessica Rothe
Alli serves as both a compassionate figure and a moral compass in the crew, often demonstrating care for the local children. Her interaction with the indigenous community highlights themes of innocence and the unforeseen consequences of violence. Throughout the ordeal, Alli evolves from naivety into someone who must confront harsh realities, ultimately shaping her character growth.
- ❤️ Compassionate
- 🌊 Innocence
- ⚖️ Conflict
- BM
Brennan Malloy (Logan Marshall-Green)
Played by Logan Marshall-Green
Brennan starts as an antagonist, leading the profiteers seeking to exploit the resources of the Amazon. His character experiences significant internal conflict as he grapples with guilt and moral choices after witnessing violence and loss. By the end, Brennan's longing for redemption and survival leads him to ally with Lena, portraying a complex character capable of change.
- 💰 Greed
- 🤝 Redemption
- ⚔️ Conflict
- J(
Jorge (Sergio Herrera)
Played by Sergio Herrera
Jorge is Lena's long-lost brother, who symbolizes hope and connection to their shared past. His survival alongside the Yaguari represents the continuity of tradition and resistance against outside threats. Jorge's eventual reunion with Lena signifies a reconnection to their roots and the shared fight to protect their land, deepening the emotional theme of family and ancestral ties.
- 🌳 Heritage
- 👨👧 Family Bond
- 🛡️ Protector
Where and When Is Beware Boiúna Set?
Beware Boiúna is set in Amazon River and Colombia. Here is why the place matters to the story.
When
The film does not specify a particular historical timeframe but reflects contemporary issues regarding environmental destruction and indigenous rights. It portrays ongoing challenges faced by the Yaguari tribe and their interactions with modernity, illustrating a persistent struggle against both corporate greed and the preservation of their heritage. The haunting presence of the mythical Boiúna symbolizes the traditional beliefs that coexist with contemporary adversities.
Where
Amazon River, Colombia
The movie takes place along the Amazon River, a vast and vital waterway known for its rich biodiversity and lush rainforest ecosystem. Colombia's part of the Amazon is home to numerous indigenous tribes, like the Yaguari, who engage in struggles for land and survival against illegal mining operations. This natural setting is crucial to the story as it highlights the conflict between human exploitation and the guardianship of ancestral lands.
- 🌊 River
- 🇨🇴 Colombia
- 🌿 Rainforest
What Are the Themes of Beware Boiúna?
3 ideas the story keeps returning to, among them Nature's Retribution, Survival & Truce and Loss and Grief.
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01
Nature's Retribution
The theme of nature's retribution is central to the narrative, embodied in the mythical serpent Boiúna, who serves as both protector and punisher of those who encroach upon the land. As characters confront the consequences of their actions against the natural world, they are reminded that nature holds power over mankind. This theme underscores the idea that environmental balance is crucial and that exploiting the earth can lead to dire repercussions.
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02
Survival & Truce
The film explores the theme of survival, particularly in the face of dire consequences and moral dilemmas. Characters like Lena are forced to navigate complex relationships with others, such as forming an uneasy alliance with Brennan. This truce reflects the broader concept of cooperation necessary for survival amidst chaos and danger, emphasizing that sometimes collaboration is required even with former adversaries to overcome greater threats.
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03
Loss and Grief
Loss is profoundly felt throughout the film, as characters grapple with the disappearances of loved ones and the repercussions of violence. Lena's quest to find her brother Jorge highlights the emotional weight of familial bonds and the impact of violence on personal lives. The theme portrays how grief can motivate individuals to change, confront their fears, and ultimately seek justice against the backdrop of their trauma.
What Kind of Film Is Beware Boiúna?
Dark in tone, with variable pacing and a moderate story, going by the plot summary.
- Tone
- Dark
- Pacing
- Variable
- Story
- Moderate
- Intensity
- High
- Ending
- Bittersweet
A tense survival horror set deep in the Amazon where a medical crew faces a relentless giant snake and hostile profiteers, balancing visceral creature attacks with themes of exploitation and indigenous resilience.
- tense
- ominous
- primal
- claustrophobic
- suspenseful
- dangerous
- survival horror
- indigenous rights
- environmental exploitation
- mythology
Content notes: graphic creature violence, character death, attempted sexual assault, murder, gore, trauma.
Quiz
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