Being a fan of both the original Japanese Guinea Pig series and Stephen Biro’s American Guinea Pig series, I was excited to hear the announcement that the latest instalment of the long-running franchise would be one of the most graphic entries released so far. And directors Stephen and Eric certainly weren’t exaggerating when they announced this.
American Guinea Pig: Slaughter of the Swine is a 2025 American found footage extreme horror film written and directed by Stephen Biro and Eric Fox, and produced by Unearthed Films. A leaked Illuminati ritual from a lost 1980s FBI file has been discovered and is now part of the American Guinea Pig Series, along with Bouquet of Blood and Guts, Bloodshock, Sacrifice, and The Song of Solomon.

Taking inspiration from political corruption and conspiracy theories surrounding Bohemian Grove and the Illuminati, American Guinea Pig: Slaughter of the Swine offers an incredibly realistic portrayal of pagan ritualistic sacrifice performed at the hands of a cabal of shadowy, masked figures. The fake FBI law enforcement title card adds an extra layer of authenticity that could convincingly fool those unaware that what they are watching is real (and, in today’s world, that might not be so unlikely).
Divided into chapters documenting the preparation, defilement, and murder of each sacrificial victim, American Guinea Pig: Slaughter of the Swine doesn’t focus much on plot or character development like, say, The Song of Solomon. Instead, the film returns to the voyeuristic origins of Bouquet of Blood and Guts – providing an abstract depiction of torture and death over traditional narrative progression. This approach is where the series shines. While I enjoy all the entries, it is at its best when functioning as non-narrative cinema, echoing the original spirit of Devil’s Experiment and Flowers of Flesh and Blood.
Employing a remarkably veristic level of practical body prosthetics, the special effects form the core of American Guinea Pig: Slaughter of the Swine. Featuring a range of torture and sexual abuse scenes, the practical effects provide an overwhelmingly visceral visualisation of religious offerings. The body prosthetics and blood work look highly impressive, utilising sophisticated partial and full-body rigs to achieve striking scenes of evisceration, disembowelment, and dismemberment.

Cinematography, handled by Sam Hel, offers an unavoidable, unfiltered view of the chaos of human mutilation and desecration. The shaky handheld camerawork and prolonged takes suit the film’s found footage style. Although incorporating a score might seem to contradict the genre’s tradition, this stylistic choice actually enhances the film. The sombre, droning synths, reminiscent of early John Carpenter, greatly amplify the visuals’ already disturbing tone without being intrusive.
Gritty and gratuitous throughout, American Guinea Pig: Slaughter of the Swine marks a return to faux-snuff territory for the long-standing series. With its naturalistic practical effects, captivating cinematography, and unsettling score, the film exudes authenticity in every frame and will undoubtedly be challenging to surpass in future instalments.

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Hey there, I’m Jim and I’m located in London, UK. I am a Writer and Managing Director here at Grimoire of Horror. A lifelong love of horror and writing has led me down this rabbit hole, allowing me to meet many amazing people and experience some truly original artwork. I specialise in world cinema, manga/graphic novels, and video games but will sometime traverse into the unknown in search of adventure.
