Blair and Dan team up to take Juliet down and go on a trip to a boarding school to learn more about Serena's mysterious past before she returned to Manhattan on the mid-season finale of Gossip Girl, airing on December 6.  Below is a promo and sneak peek for the episode.

You can also view promo photos that we previously posted for this episode.

KATIE CASSIDY AND KEVIN ZEGERS GUEST STAR

Blair (Leighton Meester) and Dan (Penn Badgley) join forces to track down an MIA Juliet (guest star Katie Cassidy). Chuck (Ed Westwick) begins to suspect Lily (Kelly Rutherford) isn’t telling him the full truth. Kevin Zegers guest stars as Damien.

Blake Lively, Chace Crawford and Matthew Settle also star. Joe Lazarov directed the episode written by Stephanie Savage and Amanda Lasher

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