When a covert military experiment goes catastrophically wrong, a small, unsuspecting town becomes the epicenter of a terrifying biological outbreak. This high-octane horror-thriller follows a desperate mother, played with fierce intensity by Adria Arjona, who must unleash her own hidden and lethal capabilities to protect her young son from the rampaging, mutated creatures that now stalk the streets. As the military, led by a hardened and morally conflicted commander portrayed by Theo Rossi, scrambles to contain the nightmare with an extreme scorched-earth protocol, the town descends into a visceral chaos of survival. With time running out and the creatures multiplying, the mother forms an uneasy alliance with a grizzled local sheriff, played by David Dastmalchian, to navigate the blood-soaked landscape. Combining relentless action with spine-chilling body horror, Onslaught delivers a gripping tale of primal instinct and maternal ferocity against an unstoppable, man-made plague.