A high school student named Sara begins the story by sharing a intimate moment with her boyfriend Skyler, only to wake up the next day to a life-changing shock: she is pregnant. The film follows her processing of this news, the fear and confusion that accompany it, and the way those around her react as the situation spirals from personal crisis into something inexplicably dangerous.
With the support of her friend Hayley, Sara goes to a clinic where the pregnancy takes a horrific turn: she gives birth to an alien creature that rampages through the facility, killing everyone in its path. The chaos forces the two teens to flee, but their ordeal deepens when Sara discovers she is still pregnant with another creature even after the terrifying birth. The two young women quickly realize they’re in serious trouble and must seek help from someone who can understand both science and danger.
They turn to Dave Hill, who plays a local farm hand known for his unconventional expertise in animal reproduction, hoping to find a way to end Sara’s nightmare. His involvement marks a shift from a private crisis to an escalating confrontation with authorities and a lurking, otherworldly threat. As plans to intervene unfold, an officer named Oscar Ruiz—who has been hunting for Sara and Hayley—arrives, leading to their arrest and transport to a police station while Sara’s mother is contacted. The tension rises further when the station becomes the site of a brutal attack as the alien presence breaches the building, killing every officer and civilian in reach.
In the aftermath, Sara gives birth to a second creature, and the first alien—now somehow linked to Sara’s mother—seizes control of the situation. The danger expands beyond Sara herself, pulling in her family and friends as they try to understand the source of the attack and the creature’s unholy methods of reproduction. The group heads to Skyler’s house in a bid to confront the truth behind the strange happenings, only to discover that Skyler himself is behaving with alarming hypersexuality, a clue that something has altered him at a fundamental level.
Driven to uncover the cause, Hayley’s brother helps the pair access Skyler’s computer, revealing a crucial piece of the puzzle: a broken ancient Mayan doll released a gas when damaged in a trip to Mexico, and that gas appears to have unlocked or amplified the creatures’ procreative abilities. The revelation clarifies the chilling mechanism at work: the monstrous beings are using humans to reproduce, a stark perversion of life that feeds on fear and vulnerability.**
Armed with this new understanding, the duo heads to a local party at their friend Kiana’s as the creatures converge on crowds, and they fight back with determination and desperation. The battles are brutal, but Sara and her allies manage to defeat the invading forces and ultimately save Sara’s mother from danger, closing the immediate threat—at least for the moment—with a hard-won resolve and a wary sense of relief.
In a final, unsettling coda, the post-credits scene shows Skyler bound and being escorted away by government agents, hinting that the mystery behind the outbreak may not be over and that powerful forces are keen to keep what happened under wraps.
