A neighborhood battle erupts between the Coopers and the Sparks when the Sparks’ new dog terrorizes Sheldon.
Blair must decide whether to meet Chuck at the top of the Empire State Building or risk losing their future together. A Gossip Girl gossip bomb involving Dan explodes Serena and Nate's relationship. Dorota and Vanya welcome their baby. Jenny hits rock bottom. Georgina returns to the Upper East Side... and she has an agenda.