1.09 "Blair Waldorf Must Pie!"

Although it is Thanksgiving, hardly anyone has the holiday spirit. Blair and Serena have a fight once Serena admits that she saw Blair with Chuck, and Blair orders Serena to keep it to herself. Meanwhile, Nate and his family share a strained Thanksgiving meal before Mr. Archibald ends up in the hospital after a suicide attempt. Having been uninvited by Blair to the Waldorf Thanksgiving meal, the Van der Woodson family has dinner with the Humphreys at their loft in Brooklyn, and the tension between Lily, Allison, and Rufus is palpable. Back in Manhattan in the Waldorf penthouse, Blair revisits her bout of bulimia after discovering that her mother forbade her father to join them for Thanksgiving. Throughout the entire episode, there are flashbacks of last year's Thanksgiving involving how Dan met an stoned Serena for the first time as well as Blair's Thanksgiving with her father and mother before their seperation. There is a stark contrast between its joy and the present's strife.