Myles and his special forces team are sent into Herne Hill city to bring back Isla, the runaway young daughter of a drug lord who is willing to pay them for their services. He must learn to get along with Connor, Isla's brother, who has decided to join his squad in searching for the missing girl. They soon arrive at a research facility crawling with undead zombies. The scientist in charge of this organization, Dr Brooks, is also creating monstrous bio weapons that obey his commands and has engineered a doomsday parasite so contagious it spreads by saliva named Final Alpha. Myles and his ex-military squad must find the girl and put a stop to Dr Brooks evil schemes before a fearsome outbreak is unleashed on the world.