Ep 22. The Wrong Goodbye

In Gossip Girl season 4 episode 22, titled "The Wrong Goodbye", the Upper East Siders are still reeling from the explosive revelation that Charlie Rhodes is not actually Serena's cousin, but rather an imposter named Ivy Dickens who was paid to pose as Charlie by Carol, Lily’s sister. Meanwhile, Blair is still struggling to come to terms with her feelings for both Chuck and Dan, and is further torn when Dan expresses his desire to be with her.

As graduation approaches, the tension between the characters builds to a boiling point. Chuck is determined to regain control of Bass Industries and enlists the help of Nate to sabotage his father's takeover bid. Meanwhile, Serena is preoccupied with catching Russell Thorpe (guest star Michael Boatman) in the act of his illegal dealings, while Lily tries to broker a deal with him to save her husband's company.

As the episode progresses, secrets and lies come to a head. Charlie/Ivy's true identity is exposed to the Upper East Siders, leading to a confrontation that has long-lasting repercussions for many of the characters. Meanwhile, both Blair and Serena must come to difficult realizations about the people they have been in relationships with and the choices they have made.

Despite the drama surrounding them, the characters gather together to celebrate their graduation. However, even this momentous occasion is not without its twists and turns. As they bid farewell to their high school years, the characters must face an uncertain future and the consequences of their actions leading up to this moment.

Overall, "The Wrong Goodbye" is a gripping and emotional episode that marks a turning point for many of the characters. With tension, heartbreak, and unexpected twists, this episode sets the stage for the dramatic events to come in future seasons of Gossip Girl.