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May Day is the twenty-second episode of the sixth season of ER, and the one hundred thirty-sixth episode overall.
Guest Stars: Emily Bergl (Gloria Milton), Amy Aquino (Dr. Janet Coburn), John Doman (Dr. Carl Deraad), Stewart McLennan (Mr. Tanner), Ellen Crawford (Lydia), Troy Evans (Frank), Yvette Freeman (Haleh), Conni Marie Brazelton (Conni), Laura Ceron (Chuny), Deezer D. (Malik), Lily Mariye (Lily), Kristin Minter (Randi), Paul O'Brien (Kicking Patient), Kyle Sullivan (Nicholas Rosato), Don Took (Mr. Rosato), Gedde Watanabe (Yosh), John Aylward (Dr. Donald Anspaugh), Monte Russell (Zadro), Alvin Alvarez (Daniel), Michelle Bonilla (Harms), Chris Butler (Cop), Greg Goggins (Screaming Man), Mary Heiss (Mary), Michael Johnson (Gunman), RonReaco Lee (Davis), Dinah Lenney (Shirley), Eric Payne (Billy Wilder), Mario Soto (SWAT Guy), Meg Thalken (McManus), Emily Wagner (Pickman)