The film begins with a well-dressed, barrel-chested man who stalks the late-night passengers of a subway train. He attacks and gruesomely eliminates several victims with a meat hammer and a butcher's hook, all while displaying an eerily unnatural strength. This sinister figure wears a ring embellished with eight stars.
Soon after, we meet Leon, a vegan photographer passionate about capturing the essence of the city's nightlife through his lens. Despite facing constant criticism from fellow photographers for avoiding dangerous situations, he decides to change his ways. One fateful night, he courageously intervenes to rescue a woman from a gang of assailants. However, the following day he learns that this woman is now missing. Intrigued by the puzzling disappearance, high on intrigue, Leon delves into news reports about similar cases, which leads him to suspect a butcher named Mahogany as the possible perpetrator who has been killing subway passengers for up to a century.
Desperate to share his findings, Leon captures photographs of Mahogany and attempts to present them to the police, only to be met with skepticism. The authorities cast doubt on his intentions instead, suggesting his motives are questionable. This dismissal spirals him into a dark obsession, much to the dismay of his girlfriend, Maya, a waitress, who shares the disbelieving sentiments of the police chief. Fueled by determination, Leon covertly boards the subway at midnight, where he witnesses a gruesome bloodbath as Mahogany continues his horrifying spree, hanging victims on meat hooks. Overwhelmed and unconscious on the subway floor, Leon awakens in a slaughterhouse with strange markings etched into his chest.
Meanwhile, Maya, alongside her friend Jurgis, a short-order cook, begins to investigate the pictures Leon shot of Mahogany. Their search leads them to the butcher's apartment, but their intrusion ends in tragedy when Jurgis is brutally captured and killed. Maya approaches the police in desperation, but their refusal mirrors their earlier dismissals of Leon's claims. As the plot thickens, suspicions arise that the police may be complicit in Mahogany's sinister activities. A police official misguidedly directs Maya towards a trip on the midnight train, oblivious to the danger lurking ahead.
Unbeknownst to Maya, Leon resolves to put an end to Mahogany's horrific crimes. Armed with a butcher's apron and several knives, he ventures into a hidden subway entrance located within the slaughterhouse. As Leon arrives, he finds Maya had been cornered by Mahogany after the butcher's latest massacre. A tense showdown ensues between Leon and Mahogany, where knives clash against the meat hammer amid the chaos of swinging human remains. In a horrific yet climactic battle, Leon eventually overcomes Mahogany, sending the butcher flying from the train just as it reaches its final stop.
In the depths of an underground cavern, filled with skulls and decomposing bodies, Mahogany reemerges, gravely wounded but still intent on killing. Their final confrontation leads to Leon impaling Mahogany’s skull on a blade. In his dying moments, Mahogany savors the victory with a chilling smirk, uttering a single word: "Welcome!"
With Mahogany defeated, the train conductor approaches Leon and Maya, cautioning them to "Please step away from the meat." This statement uncovers the dark reality behind the underground station and reveals monstrous reptilian creatures that begin devouring the fresh meat delivered to them. The conductor chillingly informs Leon that these creatures have existed beneath the city for ages, and the butcher's ominous role was to satisfy their hunger each night. In a devastating turn of events, he brutally kills Maya using one of the butcher's knives right before Leon's eyes. With a display of the same supernatural strength as Mahogany, the conductor savagely rips out Leon's tongue, tossing him aside and declaring that now, he must take Mahogany's place.
The film closes on an unsettling note as the police chief hands the train schedule to the new butcher, who dons a ring crowned with eight stars. The audience sees the new killer's identity revealed—it's Leon—now grimly prepared to continue the cycle of slaughter on the midnight train.
