|"Naughty or Nice"|
|Season 3, Episode 04|
|Air date||December 12, 2017|
|Written by||Daniel Sinclair & Danny Weiss|
|Directed by||Daisy Von Scherler Mayer|
"Trust Your Gut"
"Mountains And Molehills"
Dr. Charles learns something concerning about the man who shot him. During a complicated surgery, Dr. Rhodes and Ava finally come to an agreement. Dr. Halstead and Dr. Manning are trapped by legal ethics when an unfaithful husband refuses to tell his wife about his inconclusive Zika test. Meanwhile, Nurse Sexton and Dr. Choi discover working together isn't always easy. While Goodwin continues to argue with the board over hospital costs after an avoidable patient death.
- Brian Tee as Dr. Ethan Choi
- Colin Donnell as Dr. Connor Rhodes
- Marlyne Barrett as Maggie Lockwood
- Nick Gehlfuss as Dr. Will Halstead
- Norma Kuhling as Dr. Ava Bekker
- Oliver Platt as Dr. Daniel Charles
- Rachel DiPillo as Dr. Sarah Reese
- S. Epatha Merkerson as Sharon Goodwin
- Torrey DeVitto as Dr. Natalie Manning
- Yaya DaCosta as Nurse April Sexton