Paulino Nunes

On her last day at Westside, Joan chooses an unlikely successor, crowns a Chief Resident and imparts some final wisdom to the next generation; Gina steps in to help TJ's patient; Amy and Jake's tension intensifies while treating a pregnant teen.

On Michael's first day as Chief of Internal Medicine, Joan arrives at the hospital as a patient in dire straits; Amy clashes repeatedly with Richard over Joan's treatment plan; Gina makes a nearly impossible medical decision for a young patient.

While navigating the fallout from Katie's secret, Amy treats a critically ill patient with a dark one of her own; Jake is forced to hide the truth from Amy about Rachel's health scare; Richard returns with a trick up his sleeve.

A shocking turn of events ensues when Amy and Jake treat an expectant mother injured during a robbery; Michael is challenged to open up when Katie's therapist invites him and Amy to a session.

The officers assist in an undercover operation involving a suspected supplier of armour-piercing bullets, before taking part in a police-only boxing tournament.

Gary and Harken come across an active FBI case involving a kidnapping; Hicks and Nina grow close after Nina is questioned about the death of her boyfriend.