David J. Lee

The race for the Chief's position is on, as the doctors compete for Richard's affections, a surgical patient endangers the lives of those around her, and Meredith's Alzheimer's-stricken mother, Ellis, experiences a change in her medical condition.

The Behavioral Analysis Unit quickly determines that the person who kidnapped the daughter of a U.S. district attorney was actually after the victim's twin.

It's Halloween at Hearst College, and while Veronica is looking for Logan at the underground campus casino, the place is robbed. The thieves take Veronica's necklace, which was given to her by her deceased friend Lilly. Meanwhile, Dean O'Dell (recurring guest star ED BEGLEY JR.) and his wife, Mindy (JAIME RAY NEWMAN - "E Ring"), seek Keith's help in tracking down Steve (RICHARD GRIECO - "21 Jump Street"), the biological father of Mindy's son, who is deathly ill. And distracted by a new group of friends, Wallace struggles to pass his Mechanical Engineering class.