In a fashionable farewell to remember, everyone join forces for one last soiree, and the shocking identity of Gossip Girl is finally revealed. Serena decides to put her plans on hold and confront Dan. Georgina joins forces with Jack to help Chuck and Blair make a move that will change their relationship forever. Nate and Sage try to uncover the identity of Gossip Girl and William van der Woodsen returns to comfort Lily. Various characters from previous seasons make cameos, including Vanessa, Juliet, Agnes, Jenny, and Lola.