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The Lost is the second episode of the tenth season of ER, and the two hundred third episode overall.
Starring: Noah Wyle (Dr. John Carter), Laura Innes (Dr. Kerry Weaver) (credit only), Mekhi Phifer (Dr. Gregory Pratt) (credit only), Alex Kingston (Dr. Elizabeth Corday) (credit only), Goran Visnjic (Dr. Luka Kovac), Maura Tierney (Nurse Abby Lockhart) (credit only), Sherry Stringfield (Dr. Susan Lewis) (credit only), Ming-Na (Dr. Jing-Mei Chen) (credit only), Sharif Atkins (Dr. Michael Gallant) (credit only)
Guest Starring: Simone-Élise Girard (Gillian), Jarreth Merz (Charles), Abdul Ayoola (Patrique), Frank Bruynbroek (André Ney), Pragna Desai (Angelique), Barbara Eve Harris (Chance's Mother), Sam Hennings (), Tim Kelleher (Steve Davison), Peter J. Lucas ()
Special Guest Star: Mary McCormack (Debbie)
Special Musical Performance by: Youssou N'Dour
Co-Starring: Vincent Gomis (Orderly), Aldis Hodge (Young Man), Freddy L. Ludiazo (Bank Teller), Garikayi Mutambirwa (John Deere Boy), Rishonda Napier (Chance), Aboulaye N'Gom (Dusty Father), Maurice Daniel Oulay (Immigration Officer)