Episode 1 | Sink or Swim

When a commuter ship capsizes, the ED finds itself under water as the staff struggles to treat the influx of new patients and deal with bold new employees taking charge.

Episode 2 | Bite Your Tongue

Lenox continues to rankle Archer as the two tackle their new roles; Ripley faces possible suspension over what really happened to Pawel; Goodwin is forced to make layoffs.

Episode 3 | Trust Fall

Asher treats a woman whose undiagnosed condition threatens the lives of both her and her unborn child; Goodwin receives a chilling message while battling the hospital higher-ups.

Episode 4 | Blurred Lines

A familiar face returns to the ED; Ripley and Charles treat a woman with a rare disorder; Frost suspects that his patient's father is lying about his daughter's condition.

Episode 5 | Bad Habits

Halloween chaos takes over the E.D. Hannah helps a pregnant woman with an autistic son. Charles clashes with nurse Jackie on a psych case.

Episode 6 | Forget Me Not

Chicago P.D. steps up Goodwin's security after she's threatened online by a former employee. Archer and Frost treat victims from a disciplinary camp injured during a rockslide. Maggie gets roped into delivering a high schooler's b...

Episode 7 | Family Matters

Ripley and Frost uncover shocking information that conflicts with their patient's DNR. Asher facilitates an unexpected reunion. The tension between Lenox and Archer comes to a head.

Episode 8 | Love Will Tear Us Apart

Goodwin's troubles persist. Charles clashes with his former resident over a depressed patient. Lenox and Ripley treat a car accident victim who recently reunited with his college sweetheart.

Episode 9 | No Love Lost

The team fights to save the life of one of their own. Frost and Abrams butt heads with their patient. Asher helps a religious young woman with an ectopic pregnancy.

Episode 10 | Broken Hearts

An army of surgeons prepares to separate conjoined twins; Asher reconnects with someone from her past; Archer treats a tyrannical boss with a heart problem.

Episode 11 | In the Trenches: Part II

After a subway tunnel caves in, Ruzek and Kidd help injured passengers and pursue a suspect. Archer and Frost amputate to save a life. Lenox shoulders CPD's expectations while trying to save a colleague.

Episode 12 | In the Wake

Goodwin deals with trauma from her assault while Ripley handles an overprotected patient. A staff member's error puts their position at risk.

Episode 13 | Take a Look in the Mirror

Lenox's mentorship is put to the test; Asher helps a religious young woman with an ectopic pregnancy; Ripley's self-destructive behavior continues to escalate.

Episode 14 | Acid Test

Gaffney gets a surprise visit from a National Accreditation Board of Hospitals representative; Asher and Naomi search for the cause of a young girl's infection; Lenox and Frost work together to save the victim of an accidental sho...

Episode 15 | Down in a Hole

Ripley struggles to rescue a woman and her daughter trapped in an abandoned well; an old friend from Frost's TV days shadows Maggie; Asher discovers an extremely rare condition in her patient's ultrasound.

Episode 16 | Poster Child

When her former patient returns to Med, Goodwin learns that time doesn't heal all wounds. Lenox and Abrams work to save a woman who has been in a coma for 20 years.

Episode 17 | The Book of Archer

Charles and Archer care for a heart recipient convinced his transplant rejects him. Lenox is off for a personal day. Hannah finds an ovarian mass in a pregnant patient.