S6·E1 New Blood

Lu meets Andy 's replacement, Dr. Dylan West, an obnoxious man she worked with when she was an intern as they struggle to save the lives of the many people involved in a train accident. Later, she discovers something shocking while talking to a bipolar patient. The president is in town and the Secret Service makes sure the hospital keeps plenty of B- blood (the president's rare blood type) on hand. Dylan tries to help a pregnant patient make the right decision about a potentially hazardous surgery. Meanwhile, Lu contemplates marrying Jonas while dealing with the obnoxious woman who caused Dr. Jackson to lose his job. Later, the unthinkable happens to Lu and she and those close to her struggle to save her life.