When bullied teen Anthony finally stands up to his tormentor Randy, a violent confrontation leads to a tragic accident. Something ancient and inhuman awakens in the aftermath. As Randy's broken body is invaded by a bizarre, otherworldly parasite, a wave of grotesque transformations and unexplained violence sweeps through Garret County, Maryland. Deputy Sam Hardin, haunted by his own past encounters with the supernatural, is drawn into a spiraling nightmare as children go missing, birth defects surge, and a strange, predatory animal stalks the woods. Meanwhile, a prospector in Tennessee stumbles upon a buried alien machine, and a series of grisly incidents across the country hint at a spreading infection that threatens all of humanity. Told through the intersecting lives of traumatized families, desperate law enforcement, and ordinary people caught in extraordinary circumstances, Parasite explores the terrifying consequences of an ancient evil unleashed. As the parasite's influence grows, turning victims into hosts and spawning monstrous hybrids. Sam and his gifted son Frankie must confront the horror head-on, racing against time to contain a threat that could spell the end of mankind. Blending small-town drama, cosmic horror, and relentless suspense, Parasite is a gripping tale of survival, sacrifice, and the dark secrets lurking beneath the surface of everyday life.