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.
Ann Ryerson, Brian McGovern, Busy Philipps, Danielle Larracuente, David Aaron Baker, Emily Gonsalves, J.J. Boone, Kim Strauss, Malaya Rivera Drew, Masam Holden, Rob Swanson, Rod Keller, Scott Lawrence, Taivon McKinney, Tommy Canary, William Martin Brennan