ER revisits Dr. John Carter and reveals what he's been doing since his departure from County. Now in Darfur, Carter and colleague Dr. Dakarai work alongside relief workers to treat famine victims. Back in Chicago, Luka and Kerry differ over Clemente's next step, and Pratt and Neela treat a hit-and-run victim.

Oscar-nominated Iranian actress Shohreh Aghdashloo guests stars as a Turkish mother whose daughter is brought to the ER close to death following a knife attack. Luka and Abby must struggle both to keep her alive and to understand the reasons behind the attack. But when surgery is delayed, will Luka put his trust in a risky procedure that might save her life? Sam makes a life-altering decision, while Neela's first conference presentation doesn't go exactly as planned. Morris' children come to the ER to visit him.