In the wraparound segment Diet Phantasma, a reclusive video archivist discovers a box of unmarked videocassettes left on his porch on Halloween night. As he pops the tapes into his VCR, strange supernatural static begins bleeding through his home, distorting physical reality. The first tape, Coochie Coochie Coo, follows two teenage babysitters who accept a high-paying Halloween gig at an isolated estate. They soon discover that the homeowners are members of a grotesque adult-baby cult whose matriarch harbors a deformed, carnivorous infant hidden in the nursery. The second tape, Ut Supra Sic Infra, shifts to Spain where three mischievous teens break into sealed subterranean catacombs beneath an ancient church during a local festival. Their playful spelunking turns into a desperate fight for survival when they accidentally desecrate a tomb and awaken an ancient demonic presence that stalks them through the pitch-black tunnels. In Fun Size, two siblings roaming their suburban neighborhood encounter a mysterious house giving away oversized homemade candy. After gorging on the treats, the neighborhood children begin mutating into ravenous flesh-eating abominations, forcing the siblings to barricade themselves inside a neighbor's garage. In Kidprint, a parent reviews an old camcorder tape documenting a school Halloween parade, slowly realizing that a sinister, faceless entity was stalking his daughter throughout the day without anyone noticing. The final segment, Home Haunt, follows an amateur haunted attraction built by an overzealous suburban father. When real masked maniacs infiltrate the maze and replace the fake props with lethal weapons, terrified guests applaud the realistic carnage, assuming the slaughter is all part of the show.

In the closing minutes of Diet Phantasma, the video archivist finishes viewing the final tape. He realizes that the static noise coming from the television is synchronized with his own heartbeat. The magnetic tape inside the machine suddenly shoots outward like black tendrils, wrapping around his neck and limbs. The television screen warps into a glowing vortex showing a distorted version of his own living room. As he is dragged face-first into the CRT monitor, his screams are digitized into glitchy audio artifacts. The camera cuts to an empty, quiet living room as a newly labeled VHS cassette labeled Halloween Night spits out of the VCR deck onto the carpet, waiting for its next curious victim to press play.