S10, E3: A frustrating day for Abby gets even worse when she receives an upsetting letter from Carter, who is still in the Congo. Her fellow nurses protest work conditions, and her opinions are ignored. Abby is chastised for trying to inform a teenaged girl, Ellie (Stephanie Lineburg), whose heart and lungs are failing, that Ellie's life is in grave danger. Meanwhile, Romano's mood gets nastier when he tries on a prosthesis with an antiquated hook to replace his missing arm. Enraged, he terminates several much-needed nurses. Three new second-year residents, including self-assured Dr. Nick "Coop" Cooper (recurring guest star Glenn Howerton), join the staff. An apprehensive Pratt meets Chen's old-fashioned parents for dinner. And the playful Dr. Dorset (recurring guest star Bruno Campos) makes a positive impression with his style and substantial skills.