When Barney and Abby realize that they have one thing in common - their mutual hatred of Ted - the "couple" decides to go to the bar to flaunt their new relationship in Ted's face.
The BAU team must find a killer who has struck Detroit for the past three years solely during the raucous pre-Halloween celebration "Devil's Night."
Jake disappears with the daughter of Charlie's neighbor, a former NFL player (guest star MICHAEL CLARKE DUNCAN), and Charlie is left to cover his back. Meanwhile, Alan scores a hot date with the help of Charlie's Mercedes.
Derek and the attendings go out to celebrate when he gets the grant he needs for his clinical trial; Meredith and Alex must fend for themselves during the night shift.
After a bomb detonates in the dressing room at a military charity concert, the NCIS team must determine if the target was a washed-up '80s rocker or if the bomb was part of a larger scheme. Meanwhile, Jimmy prepares for fatherhood. Keith Carradine guest stars.
