Horrified by the key ingredient in making the philosopher's stone, the Elrics nearly give up their quest. However, Ross inspires them to continue. A hidden piece of information reveals an unused laboratory next to a prison where raw materials for the stone were gathered. Ignoring the orders of Brosh and Ross, they sneak out to investigate the laboratory themselves. Scar attacks the dormitories and gathers that the brothers have traveled to the fifth laboratory before pursuing them. Ed enters the building via an air duct, triggering several traps before finally meeting the security guard named Number 48. Outside, Al is ambushed by another security guard named Number 66.