ER/Fevers of Unknown Origin
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Fevers of Unknown Origin is the twentieth episode of the second season of ER, and the forty-sixth episode overall.
Starring: Anthony Edwards (Dr. Mark Greene), George Clooney (Dr. Doug Ross), Sherry Stringfield (Dr. Susan Lewis), Noah Wyle (Dr. John Carter), Julianna Margulies (Nurse Carol Hathaway), Gloria Reuben (Jeanie Boulet) (credit only)
Special Appearance by: Marg Helgenberger (Karen Hines)
Guest Starring: Scott Michael Campbell (Reilly Brown), Mary Mara (Loretta Sweet), Michael C. Mahon (Joe), Lynn Milgrim (Ms. Crandell), Mariangela Pino (Mrs. Delanova), Romy Rosemont (Joanne Barris), Al Ruscio (Mr. Delanova), Ellen Crawford (Lydia Wright), Yvette Freeman (Haleh Adams)
Susan absorbs herself in her work in order to avoid dealing with the fact that her sister, Chloe has been given custody of Little Susie; in order to graduate, Carter has to do a pediatric rotation with Doug; as Mark finalizes his divorce with his wife, the two of them end up getting intimate with each other; Doug continues to see his father's girlfriend, Karen; Shep's behavior becomes more aggressive and ends up shoving a boy who interferes with him treating a patient.