Ripley struggles to keep Sully's diagnosis a secret when the latter's pregnant girlfriend comes to Med for help. Johnson works to earn a spot in Med's trauma fellowship. Charles and a medical student treat a bipolar artist.

An infection threatens Marcel's risky liver transplant. Maggie and Charles help a struggling burn unit nurse. Goodwin is forced to make a tough decision about Bert's future.

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

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.

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.

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.

Maggie and Goodwin's friendship is tested as tensions rise during the nurses' union's negotiations with the hospital. Ripley and Archer treat a skateboarder struck by an emergency vehicle. Frost helps a young boy abandoned by his mother.