It's Christmas in the ER again. Luka and Abby as Rudolph and his elf, visit pediatrics, while Morris learns the meaning of Christmas when he plays Santa to a special girl. Ames takes action that creates tension between Luka and Abby, leading Luka to make a heartfelt confession. Teller returns, sending Gates and Ray on a mission, while Neela oversees an unusual kidney transplant case. Sam and Ben take a stand when a patient is dumped in an alley by Mercy Hospital. Morris, after getting a visit from one of his children, gets an offer he can't refuse, but somehow, does.
Elenco: Maura Tierney , Parminder Nagra , Scott Grimes , Linda Cardellini , John Stamos , David Lyons , Angela Bassett , Laura Innes , Lily Mariye , Linda Cardellini , Maura Tierney , Mekhi Phifer , Noah Wyle , Parminder Nagra , Scott Grimes , Sherry Stringfield , Yvette Freeman , Eriq La Salle , Kellie Martin , John Stamos , Michael Michele , Erik Palladino , Angela Bassett , David Lyons , Chase Masterson , Swoosie Kurtz , Lisa Vidal , Laura Cerón .