Lorena Diaz

Old resentment stirs up Charles when his best friends from med school visit. Asher is forced to overcome obstacles in the treatment of one of her patients. Ripley looks to honor his best friend, Sully, on the one-year anniversary of his death.

Archer and Frost confront a troubling medical mystery while treating a college basketball player. Lenox's treatment of a surrogate patient leads to unexpected complications for the patient and her best friend.

Tensions spike when a road rage incident sends three patients into the ED. Frost's former television co-star resurfaces. An unexpected arrival catches Hannah and Archer off guard.

Charles grows increasingly suspicious of a colleague's intentions. Lenox crosses a line to protect a patient. Hannah and Archer treat a soon-to-be father battling cancer.

Ino. Ethan finds himself at odds with Natalie and Sharon when it comes to the treatment of a troubled teenager who's just given birth; Dr. Halstead treats a hypochondriac with an overbearing wife.

Malignant. Rhodes and Zanetti race to save a member of Firehouse 51; April's brother struggles during his first day at the hospital; a woman saved from a burning building leads to a bigger mystery.