The Cyberdemon is the result of a top-secret experiment held in the UAC Hell Research Facility. It's remains were discovered during an expedition into hell and brought back to the facility for study. One of the head scientists had an idea: to bring the beast back to life using cybernetic technology for behavioral study and potential military use. It is currently held in a cryogenic storage chamber surrounded by Crystal Turrets and with an electrified security lock that activates if a cryogenic failure is detected.