A psychotic patient makes good on his promise to punish the medicos when he steals an Army tank and grinds his way across Chicago towards the hospital while Sam grows jealous of Dr. Kovac's visiting French friend Gillian -- and one of the E.R. staffers suffers a heart attack. Elsewhere, Kovac is startled at the lack of concern among some 13-year-olds who are diagnosed with chylamidia; Sam ponders the curious relationship between a concerned teenaged girl and her sick father who is in full cardiac arrest, and Dr. Corday is enchanted with a charming fellow surgeon.