The film begins in a horror-themed amusement park located in Orange Grove, where three friends embark on a journey through a haunted house. As the group navigates the spooky corridors, one girl strays from her companions. Suddenly, she finds herself in the presence of a masked figure who ominously hums a tune while approaching her. In a shocking turn, he stabs her in the gut and drags her away, hanging her lifeless body up, only to have it mistaken for a prop until it is discovered days later.
Fast forward three years, we meet Natalie, played by Amy Forsyth, who arrives at her best friend Brooke’s house. To her dismay, she learns that the obnoxious schoolmate Taylor, portrayed by Bex Taylor-Klaus, is also present, continually making snide remarks. Brooke reminds Natalie that a guy she likes, Gavin (played by Roby Attal), will be joining them for a thrilling night at Hell Fest, a newly opened amusement park focused on horror.
The group, which also includes Brooke’s boyfriend Quinn (Christian James) and Taylor’s boyfriend Asher (Matt Mercurio), eagerly explores the park. However, unbeknownst to them, the killer who fatally struck earlier is back, now donning a new mask.
As the friends head through a haunted reform school, they encounter a screaming girl named Britney (Courtney Dietz), who claims she’s being chased. Initially believing it is part of the act, the girls soon realize that fear has become sickeningly real when the killer targets Britney. Amidst the chaos, Natalie, still convinced it’s all staged, urges the killer to just do it. The horror escalates as the knife plunges into Britney, shocking Natalie and leaving her bewildered.
Later, the group enjoys some fun in a photo booth, only for the killer to suddenly appear and steal their photographs. When Brooke goes after him, she loses track of the sinister figure, dwindling her nerves even further.
As the evening wears on, Gavin sneaks away to win a stuffed animal for Natalie. In an attempt to bribe a game stand worker, Gavin is denied a prize. In a twist of fate, he enters the locker room, only to encounter the killer who brutally slays him, using a mallet to crush his head before appropriating Gavin’s phone to respond to Natalie’s texts, deepening her confusion.
The ride experiences a malfunction, unraveling more terror for Natalie. When she thinks she spots the killer among the darkened crowds, her paranoia peaks. Meanwhile, Quinn and Asher navigate through a haunted maze, where the killer utilizes cruel tactics that ultimately lead to Asher suffering a fatal fate.
In a moment of desperation, Natalie heads to the bathroom where she frightfully identifies the killer by a tear in his boot. Amid her frantic escape, she enlists the help of a security guard and Brooke, but the menacing figure remains elusive, showcasing that this is not just a game anymore.
The tension rises as Taylor volunteers for a performance but soon becomes the killer’s target. Attempting to stop the execution, Natalie is restrained by security, while Taylor barely escapes decapitation. The killer's thirst for terror drives him to attack Taylor brutally in front of panicked visitors.
Panic ensues as several patrons sprint for safety once the reality of a real murder sinks in. Natalie and Brooke take refuge in another haunted district, where they bravely confront their pursuer. Despite sustaining injuries, Natalie strikes back, giving a glimmer of hope as they evade the killer. A police presence arrives, but their efforts to locate the villain yield no results.
Finally, in a chilling close, the killer retreats to his home, where he tends to his collection of masks and photographs. He greets his young daughter, who innocently acknowledges him as her father, blissfully unaware of the horrifying legacy he is leaving behind, as he presents her with a stuffed animal from Hell Fest.
