BioTech, 25 October 2020: As always, BioTech Labs experiments with humans and then turn them into robots and cloned. Everything seemed normal, until one day a silly experiment went wrong. Humans turned into terrible mutants and massacred all employees of BioTech, everything was devastated, no one remained alive. Sent the U.S. army to exterminate this threat, but they were also massacred. It was useless to hide, all the mutants was loose and the corners, they killed everyone who crossed his path. Bill, a special agent, decides to enter and exterminate this threat, but will take a big surprise that everything is desolate and in ruins, there is only dead people and dead bodies, and some mutants lurking in there, your mission is to exterminate all mutants that are left before it comes out and ends to finish a whole entire city. It's time to go to hell!