A group of hooligans in London's Ballard neighborhood, Moss (John Boyega), Dennis (Franz Drameh), and Calvin, robbed a nurse named Sam (Jodie Whittaker) in the dark. While they were committing the crime, an unknown creature fell from the sky and bit Moss, who took the opportunity to escape. The angry Moss killed the creature that was neither ape nor dog, and took the corpse to visit Lang and Top Hat, who were growing marijuana. After learning that the creature might be an alien, Moss had the idea of making money, but the situation took a turn for the worse after they left the house. First, a large number of similar creatures of huge size fell from the sky, and then Moss was arrested by the police brought by Sam. In the chaos, Moss and his companions escaped, but because they collided with Top Hat's car halfway, they had to hide in Sam's house to avoid the alien monster, Top Hat and the police. Moss led his companions to try to defend the block but they could only flee from the monsters. What's worse, the main target of these monsters seemed to be Moss who killed the little monster...