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.

Charles and Archer treat a heart transplant patient who believes his new heart doesn't want to be in his body. Lenox takes a personal day. Asher discovers a mass on a pregnant woman's ovary.

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.

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.

Following the subway tunnel collapse, Ruzek and Kidd treat injured passengers and track down the missing offender. Archer and Frost perform a life-saving amputation. The crossover starts on Chicago Fire S13E11 In the Trenches (I). It continues on Chicago P.D. S12E11 In the Trenches (III).

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.

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.

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.

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 baby.

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.

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.

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.

Halloween chaos takes over the ED. Asher helps a pregnant woman with an autistic son. Charles clashes with Nurse Jackie on a psych case.

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

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 shooting.

Goodwin struggles with the psychological aftermath of her attack. Ripley treats a patient with helicopter parents. An ED staffer makes a mistake that may cost them their job.

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

Hannah makes a tough call to save a life. Frost and Ripley treat a young boy with a snake bite. Archer gives Naomi a patient to handle on her own on her last day in the E.D.

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