Randy Flagler

Will and Stevie get stuck in the middle of a marital face-off. Dr. Blake’s entire surgical team mysteriously collapses during a liver transplant. Charles encourages Ethan to reconcile with his father.

Halstead and Cuevas struggle to diagnose a patient with a rare disorder; CFD and Med staff work to free a paranoid father trapped in the MRI suite; Tanaka-Reed gets an ego check.

As Voight and his team search for the bombers, they realize there might be more bombs set to detonate; Burgess' niece fights for her life.

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.

Ruzek's future with the unit is in question after a botched undercover job; a corpse is discovered in an SUV; Lindsay and Halstead move forward with their relationship.

After a botched undercover job, Ruzek is under scrutiny by the new Street Deputy Crowley who will determine his future with the unit. A suspicious person call turns into a murder investigation when Burgess and her temporary partner Price discover the body of a dead man in an SUV. After Mouse identifies the victim as the owner of a security company, the unit soon realizes there might be more to his story. Halstead and Lindsay take a step forward in their relationship.