 The issue follows a supervillain prison outbreak at The Vault, led by Brock, that allows the inmates to overrun the prison and take its staff hostage.The Avengers and Freedom Force attempt to defeat the villains in a race against time because the prison's final fail-safe, a powerful explosive device, has been activated by Vault warden Truman Marsh.DCD estimated that the comic was their 13th-bestselling trade paperback of 1993.