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Masquerade is the fifth episode of the fifth season of ER, and the ninety-seventh episode overall.
Guest Stars: Sheila Kelley (Coco), Abraham Benrubi (Jerry), Ellen Crawford (Lydia), Lisa Nicole Carson (Carla Reese), Matthew Glave (Dr. Dale Edson), Julie Bowen (Roxanne), Vince Vieluf (Bernard Gamely), Mike Genovese (Off. Al Grabarsky), Shannon Cochran (Mrs. Klingman), Christian Hoff (Med Student in Dress), Brian Leckner (Lloyd Markovic), Monica Mikala, George Perez, Jimmie F. Skaggs (Joe Chattarowski), Angelo Tiffe, Philip Casnoff (Dr. Dan Litvak), Christine Harnos (Jenn Simon), Paul McCrane (Dr. Robert Romano), Yvonne Zima (Rachel Greene), Conni Marie Brazelton (Conni), Laura Ceron (Chuny), Deezer D. (Malik), Lily Mariye (Lily), Kristin Minter (Randi), Gedde Watanabe (Yosh), Emily Wagner (Pickman), Monte Russell (Zadro), Kevin Berntson (Willie), Justin Doran (Jay), Tim Halligan (Howard), Jana Lee Hamblin (Cheryl Leary), Morina Pierce (Amanda), Evan Sabara (Jarrod Leary), Sean A. Tate (Peanut)
It's Halloween night at County General; when Lucy is left in charge of a med school Halloween party, things go wrong when two of the med students suffer from an overdose of liquid ecstasy; Doug has his hands full with the pediatric ER filled with patients; Dr. Dan Litvak visits County General where he is revealed to be a candidate for the chief of the ER much to Weaver's chagrin; Mark and Carol treat a schizophrenic woman who claims that she's pregnant; Corday & Benton operate on an 11-year-old girl injured in a car accident and discover something surprising during her surgery; Mark learns from Rachel that she will be moving to St. Louis with her mother.