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Blood Relations is the fifteenth episode of the tenth season of ER, and the two hundred sixteenth episode overall.
Starring: Noah Wyle (Dr. John Carter), Maura Tierney (Dr. Abby Lockhart), Mekhi Phifer (Dr. Gregory Pratt), Alex Kingston (Dr. Elizabeth Corday), Goran Visnjic (Dr. Luka Kovac), Sherry Stringfield (Dr. Susan Lewis), Ming-Na (Dr. Jing-Mei Chen), Sharif Atkins (Dr. Michael Gallant), Parminder Nagra (Dr. Neela Rasgotra), Linda Cardellini (Nurse Samantha Taggart)
Special Appearance by: Thandie Newton (Makemba "Kem" Likasu)
Guest Starring: Paul Blackthorne (Dr. Jeremy Lawson), Scott Grimes (Dr. Archie Morris), Abraham Benrubi (Jerry Markovic), Deezer D. (Malik McGrath), Monté Russell (Zadro), George Kee Cheung (Mr. Chen), Patrick Fischler (Chamber Tech), Carmen Thomas (Vicki Bennett), Berlinda Tolbert (Nancy Natarelli), Rénee Victor (Florina Lopez)
Special Guest Stars: Paul Dooley (Henry Lewis)
and Donal Logue (Chuck Martin)
Co-Starring: Katya Abelsky (Christy), Michelle C. Bonilla (Harms), Rebecca Brunk (Clara), Oliver Davis (Alex), Liza Del Mundo (Severa), Andres Delgado (Zeke), Elliot Durant III (Anders), Jerod Edington (John Doe), David Figlioli (Nolan), Eric Johner (Officer Higgins), Anne Johnson (Elderly Patient), Don McGovern (Wade), Sean Michael (Technician), Sumalee Montano (Duvata Mahal), Sarah K. Peterson (Shannon Bennett), Bobby Preston (Clay Bennett), Daniel Venegas (Luis), Emily Wagner (Pickman)
The ER staff treats a family with carbon monoxide poisoning; when Neela has to sit in a hyperbaric chamber with the family's newborn baby, she develops claustrophobia; Sam ponders about her relationship with Luka; Susan reveals her pregnancy to her father; Chen returns from China with her sick father.