Christina struggles with the reality that she may lose her close friend David, whose cancer has returned. But she hopes to wrangle him a spot in a new clinical trial, one that Tom has already promised to another patient. Isabel tries to get Bobbie’s leg back after selling it on the street. Kelly has a difficult time saying goodbye to a longtime patient. Camille spends the day in Amanda’s world as part of a school project. And Candy floors Ray with some big news. Hello and Goodbye airs Tuesday, August 18 @ 98c on TNT.