Bailey arranges a domino kidney surgery involving all the residents and interns; Meredith is upset Derek didn't include her in the article on their clinical trial.

The BAU are called to apprehend a killer who has struck Detroit for the past three years during Devil's Night, the notorious pre-Halloween celebration.

As the Flag Smashers escalate their efforts, Sam and Bucky take action.

Beth prepares her dancers for the first big dance recital at her new job.

Scully blames a bizarre disorder for the deaths of several African-American men, but Mulder suspects something even stranger.

John Walker faces consequences for his actions; Sam and Bucky return to the United States.