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Lourdes Benedicto makes her first series appearance as new pediatrics intern Rena Trujillo. The episode's pre-eminent crisis occurs at the site of a commuter-train accident, where Carter (Noah Wyle) and Kovac (Goran Visnjic) are forced to extreme measures to save the life of trapped firefighter Larkin (Jeffrey Dean Morgan). The doctors also try to rescue a woman (Stacy Haiduk) who, though impaled by a shard of medal, is more concerned about the health of her son. Likewise at the scene of the accident, Corday (Alex Kingston) begins to go into contractions; and even psychiatrist Legaspi (Elizabeth Mitchell) makes an appearance when the person who caused the crash is located. Finally, an ongoing story arc is wrapped up as the dying Bishop Stewart (John Cromwell) tries to assuage Kovac's (Goran Visnjic) guilt over "deserting" his family during the Balkan wars. Advertised as ER's 150th episode, "The Crossing" is number 151 in the current syndication package.