Giant snake creature feature Beware Boiúna isn’t a reboot of Anaconda, though it bears obvious similarities, but it so effectively captures the sweaty Amazonian thrills and mean-spirited kills that it serves as a far better representation of what this subgenre has to offer than Anaconda‘s actual reboot. Director Mike P. Nelson (Wrong Turn, V/H/S/85, Silent Night, Deadly Night) breathes new life into the niche animal attack category with relentless suspense, a mythic movie monster, and a cast of characters worth rooting for.
Nelson, working from a script by Alan B. McElroy (Wrong Turn) from a story by McElroy and Tony Giglio, teases its legendary snake in an intense opener before putting the horror on the back burner to introduce the film’s wayward adventurers. That includes a group of medical missionaries providing aid to villages along the Amazon. At the forefront is Alli (Jessica Rothe), a bleeding-heart American discovering the dangers of the Amazon in real time, and Lena (Kiana Madeira), a local deckhand who’s returned home in search of her missing brother.
Alli barely evades a vicious caiman attack and learns of the Boiúna myth when a volatile encounter with a shady group of men leads to a series of escalations, one that sees Brennan (Logan Marshall-Green) hellbent on revenge. The violence awakens the giant mythic snake within the jungle.
Beware Boiúna smartly withholds its massive creature, nestling an intense thriller within the creature feature instead. It works incredibly well; you almost forget about Boiúna entirely as Alli makes impulsive decisions based on emotion that put the entire mission in harm’s way from human threats. Marshall-Green’s Brennan is volatile and dangerous, raising the stakes long before the horror commences in earnest. The cat-and-mouse game between the two opposing groups holds strong on its own, but also gives ample room for character development and deepened relationships that further instill rooting interest in both vulnerable yet out-of-her-depth Allie and the tough-as-nails Lena.
Of course, the giant snake makes her grand entrance just as tensions reach their boiling point, and McElroy and Nelson remove all sense of safety. Survival changes dynamics entirely, and it’s not guaranteed. While the snake itself is largely rendered through VFX, Nelson makes smart choices in its on-screen appearances. Like the best movie monsters, Boiúna’s carnage precedes her, and signs of her gargantuan size precede her full reveal. More importantly, Nelson keeps the carnage as practical as possible; death by Titanoboa is a nasty way to go.
Mike P. Nelson’s latest is his most tactile yet polished effort yet. Boiúna might be comprised of movie magic and well-designed, but the cast and crew trekked into the actual jungle, and it reflects on screen. There’s a constant sheen of grime and sweat that somehow fuels the unease, that adds a layer of authenticity that makes the danger more immersive.
The most vital component of the film’s authenticity, of course, is Rothe, Madeira, and Marshall-Green. All three are so well-rounded in their performances that allegiances shift and evolve. Rothe, who also has genre films Pathetic Fallacy and River screening at Fantastic Fest, plays against type as a naive newcomer prone to making the wrong choice. Marshall-Green oozes menace, but it’s Madeira who stands out most for her prickly demeanor masking vulnerable fears and adaptable smarts.
Beware Boiúna easily rises to the top of a limited subgenre for its well-staged thrills and breathless action, all anchored by well-developed characters. McElroy and Nelson smartly keep the focus on the dramatic conflicts and human sieges that Boiúna’s onslaught nearly catches you off guard. It makes for a highly entertaining, nail-biting creature feature that firmly holds you in its grip, even as it savagely rips apart nearly everything in its path.
In a year full of killer sharks, hippos, and whales, Nelson’s giant snake horror movie emerges as king of the jungle.
Beware Boiúna made its premiere at Fantastic Fest and will release in theaters October 2, 2026.
