Nate Santana

Carol receives a second chance at life when a new heart becomes available; Choi and Archer find themselves in hot water with an old patient; Halstead faces the consequences of the stolen trial medication.

Halstead returns to Med to help Goodwin with a secret investigation; Archer and Charles deal with twins who insist on being identical inside and out; Stevie and Dylan treat a young patient with sickle cell anemia.

Dr. Charles and Caroline set some major plans; Ava fights to keep her relationship with Connor; Agent Lee informs Will of news that may put his life in danger.

Will runs into trouble when one of his trial patients falls ill. His own stress and symptoms have Ethan struggling to get through the day.

Marcel deals with a patient who ends up having more in common with him than he thinks; Halstead and Choi clash over a pregnant patient with an irregular heartbeat.

A power outage at Med puts multiple patients at risk and tests the skills of the staff and their enthusiastic med students; Natalie returns following her traumatic brain injury; Ethan and April wonder if a family is in their future.