Abby's mother decides to stay in Chicago, causing Abby even more trouble. Weaver joins Dr. Legaspi for a misinterpreted dinner. Carter tries to find a drug addict who has left the hospital against medical advice. Chen's mother visits the ER and invites her to dinner, even though she is surprised by the pregnancy. Greene discovers that he has a brain tumor. Corday is sued for malpractice by Mr. Patterson, and later discovers that she's pregnant. Carter saves Abby after an explosion in exam three.