Sadistic serial killer "The Wolf" slaughtered 15 little girls before rookie cop Johnny Morgan was able to catch him. But as Johnny escorts the monster to his new home in the dark underground halls of Parker's Asylum, the nightmare is only just beginning. A power cut rips through the prison for the criminally insane, releasing the psychotic inmates, who are determined to make the most of their freedom in the only way they know how - good ol' fashioned murder.