Adrian Chase and his family are rushed to Mercy Hospital after the firebombing of their apartment. Although declared clinically dead for seven minutes before being resuscitated, Chase survives, but his wife and children are killed. Anthony Scarapelli, who is responsible for the attack, is scheduled to be “disciplined” for his unwise actions by his Mafia superior, Donna Omicidlo. Despite a court order to the contrary, Robin begins a campaign of harassment against the mob leader. Though they have misgivings about his attitude and methods, the other Teen Titans agree to help Robin prove Scarapelli’s guilt, and they begin raiding the sites of his various illegal enterprises.

Panicked, Scarapelli calls on the aid of the Monitor, who provides him with six super-powered assassins (Scorcher, Spear, Bazooka, Slasher, Tanker, and Cheshire) to use against the Titans, and troops to protect him from the Mafia godmother. In a deadly warehouse battle between the Titans and the assassins, the young heroes survive only with the unseen aid of a mysterious figure, who saves the lives of Changeling and Kid Flash by killing their assailants, Slasher and Scorcher. The wounded Changeling, and Kid Flash, who was saved from death at Cheshire’s hands by Raven, are sidelined, but Robin, using information on a tape sent to him by Chase, continues with his plan. The Titans intervene to prevent Scarapelli’s Monitor-provided troops from wiping out Donna Omicidio and her men.

Robin himself goes to Scarapelli’s home, where the mobster, about to flee the country, has been attacked by the mystery man from the warehouse fight. This costumed avenger, who calls himself the Vigilante, proves to be Adrian Chase in a new identity. When Robin confronts Chase, Scarapelli pulls a gun and shoots both Robin and Vigilante a split-second before Chase returns fire. The police arrive to find Scarapelli dead, Robin wounded, and no sign of Scarapelli’s assailant. Robin decides to remain silent regarding the Vigilante and his true identity.