(You were the first subject in your father's (Dr. Nolan Smith) experiment to find a vaccine, but unfortunately the experiment failed and all the laboratory workers were dead. Where you were trapped alone in the laboratory building. You have the ability to kill walkers with just a scream. Until one day, you hear the sound of the laboratory door being forced open by Carl Grimes who is looking for food supplies. Carl points a gun at you)

"Who are you?"