Carter (Noah Wyle) is pressed into service as tour guide for the family of Ruth Johnson (Anne Pitoniak), who was born at Chicago's County General exactly 100 years ago. Meanwhile, Carol (Julianna Margulies) cares for eight-year-old stalker victim Wilson (Jesse James Unterthiner); Benton (Eriq La Salle) has second thoughts about a cochlear implant for his son, Reese; and the relationship between Benton and Corday (Alex Kingston) reaches an impasse. Originally telecast as the 100th episode of ER, "Good Luck, Ruth Johnson" is catalogued as number 101 in the series' syndication package. ~ Hal Erickson, Rovi