Robert Dolan

Garcia travels to Alaska with the BAU team to investigate the murders of several residents of a small town.

Doug and Carrie feel insecure about their lives after they accidentally pick up the exciting pictures of another couple.

Grissom and Catherine investigate when a leg is found severed from a body in a lake. Meanwhile, Sara and Nick investigate a fraternity pledging gone terribly wrong.

When J.D. (Zach Braff) accidentally gets stuck with a needle that may have been infected with hepatitis, he starts to shy away from dealing with his sicker patients. Meanwhile, he and Elliot (Sarah Chalke) are forced to deal with four doctors (guest stars Ed Begley, Jr., William Daniels, Stephen Furst and Eric Laneuville of "St. Elsewhere") who become ill while attending a local medical convention. Elsewhere, Turk (Donald Faison) pays a high price when he goes to Dr. Cox (John C. McGinley) to help him get in shape. Ken Jenkins and Judy Reyes also star.

The Promise. As Ava is pursued by Markham and his crew, Raylan and Boyd head for their final showdown.

Alive Day. As Boyd unleashes his plan to drive Markham out of Harlan and an accidental murder places Ty Walker in the hot seat, Ava faces being exposed as an informant.