The game takes place in London, England. Horzine Biotech, a biotechnology company, is contracted to conduct experiments of a military nature involving mass biological research and genetic manipulation. one thing goes awfully wrong throughout the method of the experimentations, and human subjects begin to exhibit grotesque mutations and disfigurement. They become more and more hostile, and eventually overrun the inner security forces of the corporation.
Hours later, the primary waves of the specimens run off onto the surface, disrupting a peace protest outside the well-known military contractor. Despite the simplest efforts of native police, the civilians ar quickly engulfed and consumed by the on the face of it endless offer of clones currently streaming from the opened mouth of Horzine Biotech's headquarter. Having at liberty their sterile jail, the creatures began to diffuse to neighboring areas, desirous the helpless voters of London whereas the Metropolitan Police courageously however unprofitably decide to stem the tide of mutated flesh currently spreading across their town.
Desperate to contain the irruption from reaching overseas as planned by the currently mutated and cybernetic-enhanced someone Dr. Kevin Clamely (which is currently the Patriarch), country government quickly begins to prepare folk groups of living British Army troopers and Special Branch law enforcement officials to fight back against the hordes of mutated "specimens" currently running amok throughout the capital and its outskirts. The player takes the role of a member of 1 of those groups as they partake during a style of missions in and round the town of London.