Biohell

The City: an entire planet teeming with corruption, guns, sex, and designer drugs.
Humans are upgraded by the injection of microscopic nanobots, courtesy of new technology from the Nano-Tek corporation, but when this highly desirable technology heads onto the black market, millions of people inject themselves with pirated biomods – and transform into zombies. Now they roam the streets, out for blood, packing shotguns and bombs.
The Combat-K squad are dropped into this warzone to uncover what's turned the planet into a wasteland of murder and mutations, and soon their focus is on the darkness at the Nano-Tek corporation itself...