Giuliana Santini

Two boys brought in after a fight at school leads Cleo to discover that one of them has been injecting himself with hormones. Hathaway's obstetrics nurse, Abby Lockhart, joins the ER as a third year medical student on an ER rotation. Isabelle Corday (Judy Parfitt) arrives in Chicago as a guest lecturer and meets with her daughter, Elizabeth. Kovac and Hathaway administer to a chronically ill 3-year-old boy. Hathaway proves that his mother intentionally induces the boy's symptoms. Cleo shows Greene that she can play basketball as well as any man.

Adm. Chegwidden, with the help of Harm and Mac, investigates the apparent suicide of his mentor while on a hunting trip.

Chegwidden learns his kidnapped daughter was seeing a Mafia scion, who may be linked to illegal arms sales.

Mac starts drinking again after her possessive ex-boyfriend is killed in a car-jacking, but she is still followed by an unknown stalker.

Harm defends a fighter pilot accused by the Italian government of causing the crash of a sightseeing helicopter; guest Anne-Marie Johnson.