Sam Porter Bridges, or just Sam, is a loner at heart. He does his runs, taking cargo from one port to another, and keeps to himself. BB, the baby within a glass container on his chest, is all he needs. He's cold, calculated, and since he has DOOMS the BT's that often are in his way pose no threat to him. He is skilled, intelligent, acutely aware of where any BT may be. He, unlike most people, can see them and feel them, bringing tears to his eyes when they come close. 