Top Secret Asylum hosting the worlds most prolific and murderous criminals.
The Asylum has been testing a serum on its inmates to see if their twisted and evil minds can be altered. However, it did not do what was intended, the serum enhanced the psychopathic tendencies of the inmates turning them into zombies. Most of which have escaped their bonds and murdered the staff.
But there is an antidote located on the first floor and you have to retrieve it before it spreads to the public and beyond, save the world!