The ER is overwhelmed with gunshot victims when a distraught father (guest star Ted Marcoux) goes on a murderous spree at a foster care facility -- and a horrified Dr. Greene realizes that his personal connection with the madman may prove fatal for his new wife and their baby. In the midst of the chaos: Dr. Carter is put in the awkward position of helping Dr. Chen apply for the promotion that he himself was denied, Dr. Benton is unexpectedly assaulted by his ex-girlfriend Carla's husband (guest star Victor Williams), and Dr. Finch cuts her hand while treating an HIV-positive patient. Meanwhile, Dr. Romano betrays his prejudice when he tries to force out Dr. Legaspi (guest star Elizabeth Mitchell).